Gradiometer
Agradiometermeasures thegradient(numerical rate of change) of aphysical quantity,such as a magnetic field or gravity.[1]
Types of gradiometer[edit]
There are at least two types of gradiometer to measuremagnetic fields:
- Axial gradiometer.This device consists of twomagnetometersplaced in series (i.e., one above the other). The result coming from the device is the difference inmagnetic fluxat that point in space, in other words, the result is the difference between what each of the magnetometers detects.
- Biaxial gradiometer.This device consists of three magnetometers measuring the gradient of the magnetic field in two directions.
- Triaxial gradiometer.This device consists of four magnetometers measuring the gradient of the magnetic field in three directions.
- Planar gradiometer.This device consists of two magnetometers placed next to each other. The result coming from the device is the difference in flux between the two loops.
Each sensor type responds differently to certain spatial signals.
Axial gradiometers are good for measuring depth, while planar gradiometers can measure weak signals even under a lot of noise.[2]
See also[edit]
References[edit]
- ^"Gradiometer | Definition of Gradiometer by Merriam-Webster".Retrieved2009-03-26.
- ^Ernst Niedermeyer; Fernando Lopes da Silva (1982).Electroencephalography: Basic Principles, Clinical Applications, and Related fields.ISBN9780781751261.Retrieved2016-01-18.
{{cite book}}:CS1 maint: multiple names: authors list (link)
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