Magnetometer

Helium vector magnetometer (HVM) of thePioneer 10and11spacecraft

Amagnetometeris a device that measuresmagnetic fieldormagnetic dipole moment.Different types of magnetometers measure the direction, strength, or relative change of a magnetic field at a particular location. Acompassis one such device, one that measures the direction of an ambient magnetic field, in this case, theEarth's magnetic field.Other magnetometers measure the magnetic dipole moment of a magnetic material such as aferromagnet,for example by recording the effect of thismagnetic dipoleon the induced current in a coil.

The first magnetometer capable of measuring the absolute magnetic intensity at a point in space was invented byCarl Friedrich Gaussin 1833 and notable developments in the 19th century included theHall effect,which is still widely used.

Magnetometers are widely used for measuring the Earth's magnetic field, ingeophysical surveys,to detectmagnetic anomaliesof various types, and to determine the dipole moment of magnetic materials. In an aircraft'sattitude and heading reference system,they are commonly used as aheadingreference. Magnetometers are also used by the military as a triggering mechanism in magnetic mines to detect submarines. Consequently, some countries, such as the United States, Canada and Australia, classify the more sensitive magnetometers as military technology, and control their distribution.

Magnetometers can be used asmetal detectors:they can detect only magnetic (ferrous) metals, but can detect such metals at a much greater distance than conventional metal detectors, which rely on conductivity. Magnetometers are capable of detecting large objects, such as cars, at over 10 metres (33 ft), while a conventional metal detector's range is rarely more than 2 metres (6 ft 7 in).

In recent years, magnetometers have been miniaturized to the extent that they can be incorporated inintegrated circuitsat very low cost and are finding increasing use as miniaturized compasses (MEMS magnetic field sensor).

Introduction

Magnetic fields

Magnetic fields arevectorquantities characterized by both strength and direction. The strength of a magnetic field is measured in units ofteslain theSI units,and ingaussin thecgs systemof units. 10,000 gauss are equal to one tesla.Measurements of the Earth's magnetic field are often quoted in units of nanotesla (nT), also called a gamma.The Earth's magnetic field can vary from 20,000 to 80,000 nT depending on location, fluctuations in the Earth's magnetic field are on the order of 100 nT, and magnetic field variations due tomagnetic anomaliescan be in the picotesla (pT) range.Gaussmetersandteslametersare magnetometers that measure in units of gauss or tesla, respectively. In some contexts, magnetometer is the term used for an instrument that measures fields of less than 1 millitesla (mT) and gaussmeter is used for those measuring greater than 1 mT.

Types of magnetometer

The Magnetometer experiment for theJunoorbiter for Juno can be seen here on the end of a boom. The spacecraft uses two fluxgate magnetometers. (see alsoMagnetometer (Juno))

There are two basic types of magnetometer measurement.Vector magnetometersmeasure the vector components of a magnetic field.Total field magnetometersorscalar magnetometersmeasure the magnitude of the vector magnetic field.Magnetometers used to study the Earth's magnetic field may express the vector components of the field in terms ofdeclination(the angle between the horizontal component of the field vector and true, or geographic, north) and theinclination(the angle between the field vector and the horizontal surface).

Absolute magnetometersmeasure the absolute magnitude or vector magnetic field, using an internal calibration or known physical constants of the magnetic sensor.Relative magnetometersmeasure magnitude or vector magnetic field relative to a fixed but uncalibrated baseline. Also calledvariometers,relative magnetometers are used to measure variations in magnetic field.

Magnetometers may also be classified by their situation or intended use.Stationary magnetometersare installed to a fixed position and measurements are taken while the magnetometer is stationary.Portableormobile magnetometersare meant to be used while in motion and may be manually carried or transported in a moving vehicle.Laboratory magnetometersare used to measure the magnetic field of materials placed within them and are typically stationary.Survey magnetometersare used to measure magnetic fields in geomagnetic surveys; they may be fixed base stations, as in theINTERMAGNETnetwork, or mobile magnetometers used to scan a geographic region.

Performance and capabilities

The performance and capabilities of magnetometers are described through their technical specifications. Major specifications include

• Sample rateis the number of readings given per second. The inverse is thecycle timein seconds per reading. Sample rate is important in mobile magnetometers; the sample rate and the vehicle speed determine the distance between measurements.
• Bandwidthorbandpasscharacterizes how well a magnetometer tracks rapid changes in magnetic field. For magnetometers with no onboardsignal processing,bandwidth is determined by theNyquist limitset by sample rate. Modern magnetometers may perform smoothing or averaging over sequential samples, achieving a lower noise in exchange for lower bandwidth.
• Resolutionis the smallest change in a magnetic field the magnetometer can resolve. A magnetometer should have a resolution a good deal smaller than the smallest change one wishes to observe. This includesquantization errorwhich is caused by recording roundoff and truncation of digital expressions of the data.
• Absolute erroris the difference between the readings of a magnetometer true magnetic field.
• Driftis the change in absolute error over time.
• Thermal stabilityis the dependence of the measurement on temperature. It is given as a temperature coefficient in units of nT per degree Celsius.
• Noiseis the random fluctuations generated by the magnetometer sensor or electronics. Noise is given in units of${\rm {{nT}/{\sqrt {\rm {Hz}}}}}$,where frequency component refers to the bandwidth.
• Sensitivityis the larger of the noise or the resolution.
• Heading erroris the change in the measurement due to a change in orientation of the instrument in a constant magnetic field.
• Thedead zoneis the angular region of magnetometer orientation in which the instrument produces poor or no measurements. All optically pumped, proton-free precession, and Overhauser magnetometers experience some dead zone effects.
• Gradient toleranceis the ability of a magnetometer to obtain a reliable measurement in the presence of a magnetic fieldgradient.In surveys ofunexploded ordnanceor landfills, gradients can be large.

Early magnetometers

The compass is a simple type of magnetometer.

Coast and Geodetic Survey Magnetometer No. 18

Thecompass,consisting of a magnetized needle whose orientation changes in response to the ambient magnetic field, is a simple type of magnetometer, one that measures the direction of the field. The oscillation frequency of a magnetized needle is proportional to the square-root of the strength of the ambient magnetic field; so, for example, the oscillation frequency of the needle of a horizontally situated compass is proportional to the square-root of the horizontal intensity of the ambient field.

In 1833,Carl Friedrich Gauss,head of the Geomagnetic Observatory in Göttingen, published a paper on measurement of the Earth's magnetic field.It described a new instrument that consisted of a permanent bar magnet suspended horizontally from agoldfibre. The difference in the oscillations when the bar was magnetised and when it was demagnetised allowed Gauss to calculate an absolute value for the strength of the Earth's magnetic field.

Thegauss,theCGSunit ofmagnetic flux densitywas named in his honour, defined as onemaxwellper square centimeter; it equals 1×10⁻⁴tesla(theSI unit).

Francis RonaldsandCharles Brookeindependently invented magnetographs in 1846 that continuously recorded the magnet's movements usingphotography,thus easing the load on observers.They were quickly utilised byEdward Sabineand others in a global magnetic survey and updated machines were in use well into the 20th century.

Laboratory magnetometers

Laboratory magnetometers measure themagnetization,also known as themagnetic momentof a sample material. Unlike survey magnetometers, laboratory magnetometers require the sample to be placed inside the magnetometer, and often the temperature, magnetic field, and other parameters of the sample can be controlled. A sample's magnetization, is primarily dependent on the ordering of unpaired electrons within its atoms, with smaller contributions fromnuclear magnetic moments,Larmor diamagnetism,among others. Ordering of magnetic moments are primarily classified asdiamagnetic,paramagnetic,ferromagnetic,orantiferromagnetic(although the zoology of magnetic ordering also includesferrimagnetic,helimagnetic,toroidal,spin glass,etc.). Measuring the magnetization as a function of temperature and magnetic field can give clues as to the type of magnetic ordering, as well as anyphase transitionsbetween different types of magnetic orders that occur at critical temperatures or magnetic fields. This type of magnetometry measurement is very important to understand the magnetic properties of materials in physics, chemistry, geophysics and geology, as well as sometimes biology.

SQUID (superconducting quantum interference device)

Main article:SQUID

SQUIDs are a type of magnetometer used both as survey and as laboratory magnetometers. SQUID magnetometry is an extremely sensitive absolute magnetometry technique. However SQUIDs are noise sensitive, making them impractical as laboratory magnetometers in high DC magnetic fields, and in pulsed magnets. Commercial SQUID magnetometers are available for temperatures between 300 mK and 400 K, and magnetic fields up to 7 tesla.

Inductive pickup coils

Main article:Inductive sensor

Inductive pickup coils (also referred as inductive sensor) measure the magnetic dipole moment of a material by detecting the current induced in a coil due to the changing magnetic moment of the sample. The sample's magnetization can be changed by applying a small ac magnetic field (or a rapidly changing dc field), as occurs in capacitor-driven pulsed magnets. These measurements require differentiating between the magnetic field produced by the sample and that from the external applied field. Often a special arrangement of cancellation coils is used. For example, half of the pickup coil is wound in one direction, and the other half in the other direction, and the sample is placed in only one half. The external uniform magnetic field is detected by both halves of the coil, and since they are counter-wound, the external magnetic field produces no net signal.

VSM (vibrating-sample magnetometer)

Vibrating-sample magnetometers(VSMs) detect the dipole moment of a sample by mechanically vibrating the sample inside of an inductive pickup coil or inside of a SQUID coil. Induced current or changing flux in the coil is measured. The vibration is typically created by a motor or a piezoelectric actuator. Typically the VSM technique is about an order of magnitude less sensitive than SQUID magnetometry. VSMs can be combined with SQUIDs to create a system that is more sensitive than either one alone. Heat due to the sample vibration can limit the base temperature of a VSM, typically to 2 kelvin. VSM is also impractical for measuring a fragile sample that is sensitive to rapid acceleration.

Pulsed-field extraction magnetometry

Pulsed-field extraction magnetometry is another method making use of pickup coils to measure magnetization. Unlike VSMs where the sample is physically vibrated, in pulsed-field extraction magnetometry, the sample is secured and the external magnetic field is changed rapidly, for example in a capacitor-driven magnet. One of multiple techniques must then be used to cancel out the external field from the field produced by the sample. These include counterwound coils that cancel the external uniform field and background measurements with the sample removed from the coil.

Torque magnetometry

Magnetic torque magnetometry can be even more sensitive than SQUID magnetometry. However, magnetic torque magnetometry doesn't measure magnetism directly as all the previously mentioned methods do. Magnetic torque magnetometry instead measures the torque τ acting on a sample's magnetic moment μ as a result of a uniform magnetic field B, τ = μ × B. A torque is thus a measure of the sample's magnetic or shape anisotropy. In some cases the sample's magnetization can be extracted from the measured torque. In other cases, the magnetic torque measurement is used to detect magneticphase transitionsorquantum oscillations.The most common way to measure magnetictorqueis to mount the sample on acantileverand measure the displacement viacapacitancemeasurement between thecantileverand nearby fixed object, or by measuring thepiezoelectricityof the cantilever, or byoptical interferometryoff the surface of the cantilever.

Faraday force magnetometry

Faraday force magnetometry uses the fact that a spatial magnetic field gradient produces force that acts on a magnetized object, F = (M⋅∇)B. In Faraday force magnetometry the force on the sample can be measured by a scale (hanging the sample from a sensitive balance), or by detecting the displacement against a spring. Commonly a capacitive load cell or cantilever is used because of its sensitivity, size, and lack of mechanical parts. Faraday force magnetometry is approximately one order of magnitude less sensitive than a SQUID. The biggest drawback to Faraday force magnetometry is that it requires some means of not only producing a magnetic field, but also producing a magnetic field gradient. While this can be accomplished by using a set of special pole faces, a much better result can be achieved by using set of gradient coils. A major advantage to Faraday force magnetometry is that it is small and reasonably tolerant to noise, and thus can be implemented in a wide range of environments, including adilution refrigerator.Faraday force magnetometry can also be complicated by the presence of torque (see previous technique). This can be circumvented by varying the gradient field independently of the applied DC field so the torque and the Faraday force contribution can be separated, and/or by designing a Faraday force magnetometer that prevents the sample from being rotated.

Optical magnetometry

Optical magnetometry makes use of various optical techniques to measure magnetization. One such technique, Kerr magnetometry makes use of themagneto-optic Kerr effect,or MOKE. In this technique, incident light is directed at the sample's surface. Light interacts with a magnetized surface nonlinearly so the reflected light has an elliptical polarization, which is then measured by a detector. Another method of optical magnetometry isFaraday rotation magnetometry.Faraday rotation magnetometry utilizes nonlinear magneto-optical rotation to measure a sample's magnetization. In this method a Faraday modulating thin film is applied to the sample to be measured and a series of images are taken with a camera that senses the polarization of the reflected light. To reduce noise, multiple pictures are then averaged together. One advantage to this method is that it allows mapping of the magnetic characteristics over the surface of a sample. This can be especially useful when studying such things as theMeissner effecton superconductors. Microfabricated optically pumped magnetometers (μOPMs) can be used to detect the origin of brain seizures more precisely and generate less heat than currently available superconducting quantum interference devices, better known as SQUIDs.The device works by using polarized light to control the spin of rubidium atoms which can be used to measure and monitor the magnetic field.

Survey magnetometers

Survey magnetometers can be divided into two basic types:

• Scalarmagnetometersmeasure the total strength of the magnetic field to which they are subjected, but not its direction
• Vectormagnetometershave the capability to measure the component of the magnetic field in a particular direction, relative to thespatial orientationof the device.

A vector is a mathematical entity with both magnitude and direction. The Earth's magnetic field at a given point is a vector. Amagnetic compassis designed to give a horizontalbearingdirection, whereas avector magnetometermeasures both the magnitude and direction of the total magnetic field. Threeorthogonalsensors are required to measure the components of the magnetic field in all three dimensions.

They are also rated as "absolute" if the strength of the field can be calibrated from their own known internal constants or "relative" if they need to be calibrated by reference to a known field.

Amagnetographis a magnetometer that continuously records data over time. This data is typically represented in magnetograms.

Magnetometers can also be classified as "AC" if they measure fields that vary relatively rapidly in time (>100 Hz), and "DC" if they measure fields that vary only slowly (quasi-static) or are static. AC magnetometers find use in electromagnetic systems (such asmagnetotellurics), and DC magnetometers are used for detecting mineralisation and corresponding geological structures.

Scalar magnetometers

Proton precession magnetometer

Main article:Proton magnetometer

Proton precession magnetometers, also known asproton magnetometers,PPMs or simply mags, measure the resonance frequency ofprotons(hydrogen nuclei) in the magnetic field to be measured, due tonuclear magnetic resonance(NMR). Because the precession frequency depends only on atomic constants and the strength of the ambient magnetic field, the accuracy of this type of magnetometer can reach 1ppm.

A direct current flowing in asolenoidcreates a strong magnetic field around ahydrogen-rich fluid (keroseneanddecaneare popular, and even water can be used), causing some of the protons to align themselves with that field. The current is then interrupted, and as protons realign themselves with theambientmagnetic field, theyprecessat a frequency that is directly proportional to the magnetic field. This produces a weak rotating magnetic field that is picked up by a (sometimes separate) inductor,amplifiedelectronically, and fed to a digital frequency counter whose output is typically scaled and displayed directly as field strength or output as digital data.

For hand/backpack carried units, PPM sample rates are typically limited to less than one sample per second. Measurements are typically taken with the sensor held at fixed locations at approximately 10 metre increments.

Portable instruments are also limited by sensor volume (weight) and power consumption. PPMs work in field gradients up to 3,000 nT/m, which is adequate for most mineral exploration work. For higher gradient tolerance, such as mappingbanded iron formationsand detecting large ferrous objects,Overhauser magnetometerscan handle 10,000 nT/m, andcaesium magnetometerscan handle 30,000 nT/m.

They are relatively inexpensive (< US$8,000) and were once widely used in mineral exploration. Three manufacturers dominate the market: GEM Systems, Geometrics and Scintrex. Popular models include G-856/857, Smartmag, GSM-18, and GSM-19T.

For mineral exploration, they have been superseded by Overhauser, caesium, and potassium instruments, all of which are fast-cycling, and do not require the operator to pause between readings.

Overhauser effect magnetometer

TheOverhauser effect magnetometerorOverhauser magnetometeruses the same fundamental effect as theproton precession magnetometerto take measurements. By addingfree radicalsto the measurement fluid, thenuclear Overhauser effectcan be exploited to significantly improve upon the proton precession magnetometer. Rather than aligning theprotonsusing a solenoid, a low power radio-frequency field is used to align (polarise) the electron spin of the free radicals, which then couples to the protons via the Overhauser effect. This has two main advantages: driving the RF field takes a fraction of the energy (allowing lighter-weight batteries for portable units), and faster sampling as the electron-proton coupling can happen even as measurements are being taken. An Overhauser magnetometer produces readings with a 0.01 nT to 0.02 nT standard deviation while sampling once per second.

Caesium vapour magnetometer

Theoptically pumpedcaesiumvapour magnetometeris a highly sensitive (300 fT/Hz^0.5) and accurate device used in a wide range of applications. It is one of a number of alkali vapours (includingrubidiumandpotassium) that are used in this way.

The device broadly consists of aphotonemitter, such as a laser, an absorption chamber containing caesium vapour mixed with a "buffer gas"through which the emittedphotonspass, and a photon detector, arranged in that order. The buffer gas is usuallyheliumornitrogenand they are used to reduce collisions between the caesium vapour atoms.

The basic principle that allows the device to operate is the fact that a caesium atom can exist in any of nineenergy levels,which can be informally thought of as the placement ofelectronatomic orbitalsaround theatomic nucleus.When a caesium atom within the chamber encounters a photon from the laser, it is excited to a higher energy state, emits a photon and falls to an indeterminate lower energy state. The caesium atom is "sensitive" to the photons from the laser in three of its nine energy states, and therefore, assuming a closed system, all the atoms eventually fall into a state in which all the photons from the laser pass through unhindered and are measured by the photon detector. The caesium vapour has become transparent. This process happens continuously to maintain as many of the electrons as possible in that state.

At this point, the sample (or population) is said to have been optically pumped and ready for measurement to take place. When an external field is applied it disrupts this state and causes atoms to move to different states which makes the vapour less transparent. The photo detector can measure this change and therefore measure the magnitude of the magnetic field.

In the most common type of caesium magnetometer, a very small AC magnetic field is applied to the cell. Since the difference in the energy levels of the electrons is determined by the external magnetic field, there is a frequency at which this small AC field makes the electrons change states. In this new state, the electrons once again can absorb a photon of light. This causes a signal on a photo detector that measures the light passing through the cell. The associated electronics use this fact to create a signal exactly at the frequency that corresponds to the external field.

Another type of caesium magnetometer modulates the light applied to the cell. This is referred to as a Bell-Bloom magnetometer, after the two scientists who first investigated the effect. If the light is turned on and off at the frequency corresponding to the Earth's field,there is a change in the signal seen at the photo detector. Again, the associated electronics use this to create a signal exactly at the frequency that corresponds to the external field. Both methods lead to high performance magnetometers.

Potassium vapour magnetometer

Potassium is the only optically pumped magnetometer that operates on a single, narrow electron spin resonance (ESR) line in contrast to other alkali vapour magnetometers that use irregular, composite and wide spectral lines and helium with the inherently wide spectral line.

Metastable helium-4 scalar magnetometer

Magnetometers based onhelium-4excited to its metastable triplet state thanks to a plasma discharge have been developed in the 1960s and 70s byTexas Instruments,then by its spinoff Polatomic,and from late 1980s byCEA-Leti.The latter pioneered a configuration which cancels the dead-zones,which are a recurrent problem of atomic magnetometers. This configuration was demonstrated to show an accuracy of 50 pT in orbit operation. TheESAchose this technology for theSwarm mission,which was launched in 2013. An experimental vector mode, which could compete with fluxgate magnetometers was tested in this mission with overall success.

Applications

The caesium and potassium magnetometers are typically used where a higher performance magnetometer than the proton magnetometer is needed. In archaeology and geophysics, where the sensor sweeps through an area and many accurate magnetic field measurements are often needed, caesium and potassium magnetometers have advantages over the proton magnetometer.

The caesium and potassium magnetometer's faster measurement rate allows the sensor to be moved through the area more quickly for a given number of data points. Caesium and potassium magnetometers are insensitive to rotation of the sensor while the measurement is being made.

The lower noise of caesium and potassium magnetometers allow those measurements to more accurately show the variations in the field with position.

Vector magnetometers

Vector magnetometers measure one or more components of the magnetic field electronically. Using three orthogonal magnetometers, both azimuth and dip (inclination) can be measured. By taking the square root of the sum of the squares of the components the total magnetic field strength (also called total magnetic intensity, TMI) can be calculated by thePythagorean theorem.

Vector magnetometers are subject to temperature drift and the dimensional instability of the ferrite cores. They also require leveling to obtain component information, unlike total field (scalar) instruments. For these reasons they are no longer used for mineral exploration.

Rotating coil magnetometer

The magnetic field induces a sine wave in a rotatingcoil.The amplitude of the signal is proportional to the strength of the field, provided it is uniform, and to thesineof the angle between the rotation axis of the coil and the field lines. This type of magnetometer is obsolete.

Hall effect magnetometer

Main article:Hall effect sensor

The most common magnetic sensing devices aresolid-stateHall effectsensors. These sensors produce a voltage proportional to the applied magnetic field and also sense polarity. They are used in applications where the magnetic field strength is relatively large, such as inanti-lock braking systemsin cars, which sense wheel rotation speed via slots in the wheel disks.

Magnetoresistive devices

Main article:Magnetoresistance

These are made of thin strips ofPermalloy,a highmagnetic permeability,nickel-iron alloy, whose electrical resistance varies with a change in magnetic field. They have a well-defined axis of sensitivity, can be produced in 3-D versions and can be mass-produced as an integrated circuit. They have a response time of less than 1 microsecond and can be sampled in moving vehicles up to 1,000 times/second. They can be used in compasses that read within 1°, for which the underlying sensor must reliably resolve 0.1°.

Fluxgate magnetometer

See also:Gradiometer

A uniaxial fluxgate magnetometer

Afluxgate compass/inclinometer

Basic principles of a fluxgate magnetometer

The fluxgate magnetometer was invented by H. Aschenbrenner and G. Goubau in 1936.A team at Gulf Research Laboratories led byVictor Vacquierdeveloped airborne fluxgate magnetometers to detect submarines duringWorld War IIand after the war confirmed the theory ofplate tectonicsby using them to measure shifts in the magnetic patterns on the sea floor.

A fluxgate magnetometer consists of a small magnetically susceptible core wrapped by two coils of wire. An alternating electric current is passed through one coil, driving the core through an alternating cycle ofmagnetic saturation;i.e., magnetised, unmagnetised, inversely magnetised, unmagnetised, magnetised, and so forth. This constantly changing field induces a voltage in the second coil which is measured by a detector. In a magnetically neutral background, the input and output signals match. However, when the core is exposed to a background field, it is more easily saturated in alignment with that field and less easily saturated in opposition to it. Hence the alternating magnetic field and the induced output voltage, are out of step with the input current. The extent to which this is the case depends on the strength of the background magnetic field. Often, the signal in the output coil is integrated, yielding an output analog voltage proportional to the magnetic field.

A wide variety of sensors are currently available and used to measure magnetic fields.Fluxgate compassesandgradiometersmeasure the direction and magnitude of magnetic fields. Fluxgates are affordable, rugged and compact with miniaturization recently advancing to the point of complete sensor solutions in the form of IC chips, including examples from both academiaand industry.This, plus their typically low power consumption makes them ideal for a variety of sensing applications. Gradiometers are commonly used for archaeological prospecting andunexploded ordnance(UXO) detection such as the German military's popularFoerster.

The typical fluxgate magnetometer consists of a "sense" (secondary) coil surrounding an inner "drive" (primary) coil that is closely wound around a highly permeable core material, such asmu-metalorpermalloy.An alternating current is applied to the drive winding, which drives the core in a continuous repeating cycle of saturation and unsaturation. To an external field, the core is alternately weakly permeable and highly permeable. The core is often a toroidally wrapped ring or a pair of linear elements whose drive windings are each wound in opposing directions. Such closed flux paths minimise coupling between the drive and sense windings. In the presence of an external magnetic field, with the core in a highly permeable state, such a field is locally attracted or gated (hence the name fluxgate) through the sense winding. When the core is weakly permeable, the external field is less attracted. This continuous gating of the external field in and out of the sense winding induces a signal in the sense winding, whose principal frequency is twice that of the drive frequency, and whose strength and phase orientation vary directly with the external-field magnitude and polarity.

There are additional factors that affect the size of the resultant signal. These factors include the number of turns in the sense winding, magnetic permeability of the core, sensor geometry, and the gated flux rate of change with respect to time.

Phase synchronous detection is used to extract these harmonic signals from the sense winding and convert them into a DC voltage proportional to the external magnetic field. Active current feedback may also be employed, such that the sense winding is driven to counteract the external field. In such cases, the feedback current varies linearly with the external magnetic field and is used as the basis for measurement. This helps to counter inherent non-linearity between the applied external field strength and the flux gated through the sense winding.

SQUID magnetometer

Main article:SQUID

SQUIDs,or superconducting quantum interference devices, measure extremely small changes in magnetic fields. They are very sensitive vector magnetometers, with noise levels as low as 3 fT Hz^−½in commercial instruments and 0.4 fT Hz^−½in experimental devices. Many liquid-helium-cooled commercial SQUIDs achieve a flat noise spectrum from near DC (less than 1 Hz) to tens of kilohertz, making such devices ideal for time-domain biomagnetic signal measurements. SERF atomic magnetometers demonstrated in laboratories so far reach competitive noise floor but in relatively small frequency ranges.

SQUID magnetometers require cooling with liquidhelium(4.2K) orliquid nitrogen(77 K) to operate, hence the packaging requirements to use them are rather stringent both from a thermal-mechanical as well as magnetic standpoint. SQUID magnetometers are most commonly used to measure the magnetic fields produced by laboratory samples, also for brain or heart activity (magnetoencephalographyandmagnetocardiography,respectively). Geophysical surveys use SQUIDs from time to time, but the logistics of cooling the SQUID are much more complicated than other magnetometers that operate at room temperature.

Zero-field optically-pumped magnetometers

Magnetometers based on atomic gasses can perform vector measurements of the magnetic field in the low field regime, where the decay of the atomic coherence becomes faster than theLarmor frequency.The physics of such magnetometers is based on theHanle effect.Such zero-field optically pumped magnetometers have been tested in various configurations and with different atomic species, notablyalkali(potassium, rubidium and cesium),heliumandmercury.For the case of alkali, the coherence times were greatly limited due to spin-exchange relaxation. A major breakthrough happened at the beginning of the 2000 decade, Romalis group in Princeton demonstrated that in such a low field regime, alkali coherence times can be greatly enhanced if a high enough density can be reached by high temperature heating, this is the so-calledSERF effect.

The main interest of optically-pumped magnetometers is to replace SQUID magnetometers in applications where cryogenic cooling is a drawback. This is notably the case of medical imaging where such cooling imposes a thick thermal insulation, strongly affecting the amplitude of the recorded biomagnetic signals. Several startup companies are currently developing optically pumped magnetometers for biomedical applications: those of TwinLeaf,quSpinand FieldLinebeing based on alkali vapors, and those of Mag4Health on metastable helium-4.

Spin-exchange relaxation-free (SERF) atomic magnetometers

Main article:SERF

At sufficiently high atomic density, extremely high sensitivity can be achieved. Spin-exchange-relaxation-free (SERF) atomic magnetometers containingpotassium,caesium,orrubidiumvapor operate similarly to the caesium magnetometers described above, yet can reach sensitivities lower than 1 fT Hz^−1⁄2.The SERF magnetometers only operate in small magnetic fields. The Earth's field is about 50μT;SERF magnetometers operate in fields less than 0.5 μT.

Large volume detectors have achieved a sensitivity of 200 aT Hz^−1⁄2.This technology has greater sensitivity per unit volume than SQUID detectors.The technology can also produce very small magnetometers that may in the future replace coils for detecting radio-frequency magnetic fields.This technology may produce a magnetic sensor that has all of its input and output signals in the form of light on fiber-optic cables.This lets the magnetic measurement be made near high electrical voltages.

Calibration of magnetometers

The calibration of magnetometers is usually performed by means of coils which are supplied by an electrical current to create a magnetic field. It allows to characterize the sensitivity of the magnetometer (in terms of V/T). In many applications the homogeneity of the calibration coil is an important feature. For this reason, coils likeHelmholtz coilsare commonly used either in a single axis or a three axis configuration. For demanding applications a high homogeneity magnetic field is mandatory, in such cases magnetic field calibration can be performed using aMaxwell coil,cosine coils,or calibration in the highly homogenousEarth's magnetic field.

Uses

Magnetometers can measure the magnetic fields of planets.

Magnetometers have a very diverse range of applications, including locating objects such as submarines, sunken ships, hazards fortunnel boring machines,hazards in coal mines, unexploded ordnance, toxic waste drums, as well as a wide range of mineral deposits and geological structures. They also have applications in heart beat monitors, weapon systems positioning, sensors in anti-locking brakes, weather prediction (via solar cycles), steel pylons, drill guidance systems, archaeology, plate tectonics and radio wave propagation and planetary exploration. Laboratory magnetometers determine the magnetic dipole moment of a magnetic sample, typically as a function oftemperature,magnetic field,or other parameter. This helps to reveal its magnetic properties such asferromagnetism,antiferromagnetism,superconductivity,or other properties that affectmagnetism.

Depending on the application, magnetometers can be deployed in spacecraft, aeroplanes (fixed wingmagnetometers), helicopters (stingerandbird), on the ground (backpack), towed at a distance behindquad bikes(ATVs) on a (sledortrailer), lowered into boreholes (tool,probeorsonde) and towed behind boats (tow fish).

Mechanical stress measurement

Magnetometers are used to measure or monitor mechanical stress in ferromagnetic materials. Mechanical stress will improve alignment of magnetic domains in microscopic scale that will raise the magnetic field measured close to the material by magnetometers. There are different hypothesis about stress-magnetisation relationship. However the effect of mechanical stress on measured magnetic field near the specimen is claimed to be proven in many scientific publications. There have been efforts to solve the inverse problem of magnetisation-stress resolution in order to quantify the stress based on measured magnetic field.

Accelerator physics

Aust.-Synchrotron,-Quadrupole-Magnets-of-Linac,-14.06.2007

Magnetometers are used extensively in experimental particle physics to measure the magnetic field of pivotal components such as the concentration or focusing beam-magnets.

Archaeology

Main article:Magnetic survey (archaeology)

Magnetometers are also used to detectarchaeological sites,shipwrecks,and other buried or submerged objects. Fluxgategradiometersare popular due to their compact configuration and relatively low cost. Gradiometers enhance shallow features and negate the need for a base station. Caesium and Overhauser magnetometers are also very effective when used as gradiometers or as single-sensor systems with base stations.

The TV programTime Teampopularised 'geophys', including magnetic techniques used in archaeological work to detect fire hearths, walls of baked bricks and magnetic stones such as basalt and granite. Walking tracks and roadways can sometimes be mapped with differential compaction in magnetic soils or with disturbances in clays, such as on theGreat Hungarian Plain.Ploughed fields behave as sources of magnetic noise in such surveys.

Auroras

Magnetometers can give an indication of auroral activity before thelightfrom theaurorabecomes visible. A grid of magnetometers around the world constantly measures the effect of the solar wind on the Earth's magnetic field, which is then published on theK-index.

Coal exploration

While magnetometers can be used to help map basin shape at a regional scale, they are more commonly used to map hazards to coal mining, such as basaltic intrusions (dykes,sills,andvolcanic plug) that destroy resources and are dangerous to longwall mining equipment. Magnetometers can also locate zones ignited by lightning and mapsiderite(an impurity in coal).

The best survey results are achieved on the ground in high-resolution surveys (with approximately 10 m line spacing and 0.5 m station spacing). Bore-hole magnetometers using a Ferretcan also assist when coal seams are deep, by using multiple sills or looking beneath surface basalt flows.

Modern surveys generally use magnetometers withGPStechnology to automatically record the magnetic field and their location. The data set is then corrected with data from a second magnetometer (the base station) that is left stationary and records the change in the Earth's magnetic field during the survey.

Directional drilling

Magnetometers are used indirectional drillingfor oil or gas to detect theazimuthof the drilling tools near the drill.They are most often paired withaccelerometersin drilling tools so that both theinclinationand azimuth of the drill can be found.

Military

For defensive purposes, navies use arrays of magnetometers laid across sea floors in strategic locations (i.e. around ports) to monitor submarine activity. The RussianAlfa-classtitanium submarines were designed and built at great expense to thwart such systems (as pure titanium is non-magnetic).

Military submarines aredegaussed—by passing through large underwater loops at regular intervals—to help them escape detection by sea-floor monitoring systems,magnetic anomaly detectors,and magnetically-triggered mines. However, submarines are never completely de-magnetised. It is possible to tell the depth at which a submarine has been by measuring its magnetic field, which is distorted as the pressure distorts the hull and hence the field. Heating can also change the magnetization of steel.

Submarines tow long sonar arrays to detect ships, and can even recognise different propeller noises. The sonar arrays need to be accurately positioned so they can triangulate direction to targets (e.g. ships). The arrays do not tow in a straight line, so fluxgate magnetometers are used to orient each sonar node in the array.

Fluxgates can also be used in weapons navigation systems, but have been largely superseded by GPS andring laser gyroscopes.

Magnetometers such as the German Foerster are used to locate ferrous ordnance. Caesium and Overhauser magnetometers are used to locate and help clean up old bombing and test ranges.

UAV payloads also include magnetometers for a range of defensive and offensive tasks.

Mineral exploration

Main article:Exploration geophysics

ADiamond DA42light aircraft,modified for aerial survey with a nose-mounted boom containing a magnetometer at its tip

Magnetometric surveys can be useful in defining magnetic anomalies which represent ore (direct detection), or in some cases gangue minerals associated with ore deposits (indirect or inferential detection). This includesiron ore,magnetite,hematite,and oftenpyrrhotite.

Developed countries such as Australia, Canada and USA invest heavily in systematic airborne magnetic surveys of their respective continents and surrounding oceans, to assist with map geology and in the discovery of mineral deposits. Such aeromag surveys are typically undertaken with 400 m line spacing at 100 m elevation, with readings every 10 meters or more. To overcome the asymmetry in the data density, data is interpolated between lines (usually 5 times) and data along the line is then averaged. Such data is gridded to an 80 m × 80 m pixel size and image processed using a program like ERMapper. At an exploration lease scale, the survey may be followed by a more detailed helimag or crop duster style fixed wing at 50 m line spacing and 50 m elevation (terrain permitting). Such an image is gridded on a 10 x 10 m pixel, offering 64 times the resolution.

Where targets are shallow (<200 m), aeromag anomalies may be followed up with ground magnetic surveys on 10 m to 50 m line spacing with 1 m station spacing to provide the best detail (2 to 10 m pixel grid) (or 25 times the resolution prior to drilling).

Magnetic fields from magnetic bodies of ore fall off with the inverse distance cubed (dipoletarget), or at best inverse distance squared (magnetic monopoletarget). One analogy to the resolution-with-distance is a car driving at night with lights on. At a distance of 400 m one sees one glowing haze, but as it approaches, two headlights, and then the left blinker, are visible.

There are many challenges interpreting magnetic data for mineral exploration. Multiple targets mix together like multiple heat sources and, unlike light, there is no magnetic telescope to focus fields. The combination of multiple sources is measured at the surface. The geometry, depth, or magnetisation direction (remanence) of the targets are also generally not known, and so multiple models can explain the data.

Potent by Geophysical Software Solutions[1]is a leading magnetic (and gravity) interpretation package used extensively in the Australian exploration industry.

Magnetometers assist mineral explorers both directly (i.e., gold mineralisation associated withmagnetite,diamonds inkimberlite pipes) and, more commonly, indirectly, such as by mapping geological structures conducive to mineralisation (i.e., shear zones and alteration haloes around granites).

Airborne Magnetometers detect the change in the Earth's magnetic field using sensors attached to the aircraft in the form of a "stinger" or by towing a magnetometer on the end of a cable. The magnetometer on a cable is often referred to as a "bomb" because of its shape. Others call it a "bird".

Because hills and valleys under the aircraft make the magnetic readings rise and fall, a radar altimeter keeps track of the transducer's deviation from the nominal altitude above ground. There may also be a camera that takes photos of the ground. The location of the measurement is determined by also recording a GPS.

Mobile phones

Tri-axis Electronic Magnetometer byAKM Semiconductor,insideMotorola Xoom

Many smartphones contain miniaturizedmicroelectromechanical systems(MEMS) magnetometers which are used to detect magnetic field strength and are used ascompasses.The iPhone 3GS has a magnetometer, a magnetoresistive permalloy sensor, the AN-203 produced by Honeywell.In 2009, the price of three-axis magnetometers dipped below US$1 per device and dropped rapidly. The use of a three-axis device means that it is not sensitive to the way it is held in orientation or elevation. Hall effect devices are also popular.

Researchers atDeutsche Telekomhave used magnetometers embedded in mobile devices to permit touchless3D interaction.Their interaction framework, called MagiTact, tracks changes to the magnetic field around a cellphone to identify different gestures made by a hand holding or wearing a magnet.

Oil exploration

Seismicmethods are preferred to magnetometers as the primary survey method for oil exploration although magnetic methods can give additional information about the underlying geology and in some environments evidence of leakage from traps.Magnetometers are also used in oil exploration to show locations of geologic features that make drilling impractical, and other features that give geophysicists a more complete picture ofstratigraphy.

Spacecraft

Main article:Spacecraft magnetometer

A three-axis fluxgate magnetometer was part of theMariner 2andMariner 10missions.A dual technique magnetometer is part of theCassini–Huygensmission to explore Saturn.This system is composed of avector heliumand fluxgate magnetometers.Magnetometers were also a component instrument on the MercuryMESSENGERmission. A magnetometer can also be used by satellites likeGOESto measure both themagnitudeanddirectionof the magnetic field of a planet or moon.

Magnetic surveys

Ground surveying in Surprise Valley, Cedarville, California

Systematic surveys can be used to in searching for mineral deposits or locating lost objects. Such surveys are divided into:

• Aeromagnetic survey
• Borehole
• Ground
• Marine

Aeromag datasets for Australia can be downloaded from theGADDS database.

Data can be divided in point located and image data, the latter of which is in ERMapper format.

Magnetovision

On the base of space measured distribution of magnetic field parameters (e.g. amplitude or direction), themagnetovisionimages may be generated. Such presentation of magnetic data is very useful for further analyse anddata fusion.

Gradiometer

Magneticgradiometersare pairs of magnetometers with their sensors separated, usually horizontally, by a fixed distance. The readings are subtracted to measure the difference between the sensed magnetic fields, which gives the field gradients caused by magnetic anomalies. This is one way of compensating both for the variability in time of the Earth's magnetic field and for other sources of electromagnetic interference, thus allowing for more sensitive detection of anomalies. Because nearly equal values are being subtracted, the noise performance requirements for the magnetometers is more extreme.

Gradiometers enhance shallow magnetic anomalies and are thus good for archaeological and site investigation work. They are also good for real-time work such asunexploded ordnance(UXO) location. It is twice as efficient to run a base station and use two (or more) mobile sensors to read parallel lines simultaneously (assuming data is stored and post-processed). In this manner, both along-line and cross-line gradients can be calculated.

Position control of magnetic surveys

In traditional mineral exploration and archaeological work, grid pegs placed by theodolite and tape measure were used to define the survey area. Some UXO surveys used ropes to define the lanes. Airborne surveys used radio triangulation beacons, such as Siledus.

Non-magnetic electronic hipchain triggers were developed to trigger magnetometers. They used rotary shaft encoders to measure distance along disposable cotton reels.

Modern explorers use a range of low-magnetic signature GPS units, including real-time kinematic GPS.

Heading errors in magnetic surveys

Magnetic surveys can suffer from noise coming from a range of sources. Different magnetometer technologies suffer different kinds of noise problems.

Heading errors are one group of noise. They can come from three sources:

• Sensor
• Console
• Operator

Some total field sensors give different readings depending on their orientation. Magnetic materials in the sensor itself are the primary cause of this error. In some magnetometers, such as the vapor magnetometers (caesium, potassium, etc.), there are sources of heading error in the physics that contribute small amounts to the total heading error.

Console noise comes from magnetic components on or within the console. These include ferrite in cores in inductors and transformers, steel frames around LCDs, legs on IC chips and steel cases in disposable batteries. Some popular MIL spec connectors also have steel springs.

Operators must take care to be magnetically clean and should check the 'magnetic hygiene' of all apparel and items carried during a survey.Akubrahats are very popular in Australia, but their steel rims must be removed before use on magnetic surveys. Steel rings on notepads, steel capped boots and steel springs in overall eyelets can all cause unnecessary noise in surveys. Pens, mobile phones and stainless steel implants can also be problematic.

The magnetic response (noise) from ferrous object on the operator and console can change with heading direction because of induction and remanence. Aeromagnetic survey aircraft and quad bike systems can use special compensators to correct for heading error noise.

Heading errors look likeherringbone patternsin survey images. Alternate lines can also be corrugated.

Image processing of magnetic data

Recording data and image processing is superior to real-time work because subtle anomalies often missed by the operator (especially in magnetically noisy areas) can be correlated between lines, shapes and clusters better defined. A range of sophisticated enhancement techniques can also be used. There is also a hard copy and need for systematic coverage.

Aircraft navigation

The Magnetometer Navigation (MAGNAV) algorithm was initially running as a flight experiment in 2004.Later on, diamond magnetometers were developed by theUnited States Air Force Research Laboratory(AFRL) as a better method of navigation which cannot be jammed by the enemy.

See also

• Accelerometer– Device that measures proper acceleration
• Aeromagnetic survey– Surveying method, analyzing the magnetic properties of large regions from high altitudes
• Earth's field NMR– NMR use in the geomagnetic field
• EMF measurement– Measurement of ambient electromagnetic field
• Gyroscope– Device for measuring or maintaining the orientation and angular velocity
• Inertial measurement unit– Accelerometer-based navigational device
• Intermagnet– global network of observatories, monitoring the Earth's magnetic fieldPages displaying wikidata descriptions as a fallback
• Magnetic anomaly detector– Instrument for detecting variations in the Earth's magnetic field
• Magnetic immunoassay– Diagnostic immunoassay using magnetic beads
• Magnetization– Physical quantity, density of magnetic moment per volume
• Magnetogram (disambiguation)
• MEMS magnetic field sensor
• Metal detector– Electronic instrument which detects the presence of metal nearby
• SQUID– Type of magnetometer
• Vibrating-sample magnetometer– scientific instrument to measure magnetic propertiesPages displaying wikidata descriptions as a fallback
• Zero field NMR– Acquisition of NMR spectra of chemicals

Further reading

• Hollos, Stefan; Hollos, Richard (2008).Signals from the Subatomic World: How to Build a Proton Precession Magnetometer.Abrazol Publishing.ISBN978-1-887187-09-1.
• Ripka, Pavel, ed. (2001).Magnetic sensors and magnetometers.Boston, Mass.: Artech House.ISBN978-1-58053-057-6.
• Tumanski, S. (2011). "4. Magnetic sensors".Handbook of magnetic measurements.Boca Raton, FL: CRC Press. pp. 159–256.ISBN978-1-4398-2952-3.

External links

• Earthquake forecasting techniques and more research on the study of electromagnetic fields
• USGS Geomagnetism Program
• Earth's Field NMR (EFNMR)
• Space-based magnetometers
• Practical guidelines for building a magnetometer by hobbyists – Part 1 IntroductionArchived10 July 2012 at theWayback Machine
• Practical guidelines for building a magnetometer by hobbyists – Part 2 BuildingArchived24 February 2021 at theWayback Machine