Common non-contact current measurement methods in the electric power system are AC current transformer, Rogowski coil [8], Hall current sensor [9],
fluxgate and optical current sensor [10], etc.
Two scientists working at Soreq NRC analyze the sources of noise and clutter that magnetic sensing system developers encounter, describe example magnetic systems surveillance and survey applications, introduce several methods for reducing the power consumption of
fluxgates, and propose a digital selective bandpass sampling where the
fluxgate output is sampled only once.
Druez, "What interest to use caesium magnetometer instead of
fluxgate gradiometer?" ArcheoSciences, vol.
Gruger, "Array of miniaturized
fluxgate sensors for nondestructive testing applications," Sensors and Actuators A: Physical, vol.
Vectorial magnetometers which serve for monitoring of Earth's field variations due to diurnal field changes, geomagnetic storms, etc., are standard instruments deployed at geomagnetic observatories and variation stations; they are mostly based on
fluxgate sensors [1].
It consists of two triaxial
fluxgate sensors and the associated electronics.
Weak magnetic signals sensors which are based on
fluxgate and used to measure the magnetic field intensity in X direction (normal direction) and Y direction (axial direction) are fixed beside the strain gages.
The geomagnetic field measured with Hirst GM08 Gaussmeter and Hirst Axial
Fluxgate Probe AFG100 (Hirst Magnetic Instruments Ltd., Cornwall, UK) was about 33 [micro]T and almost vertical (inclination 80-85[degrees]) in the incubators.
A series of Zero-Gauss Chambers provides the low magnetic field required for sensitive scientific experiments or when developing devices based on magnetic field sensors such as
fluxgate compasses.
The other housing contains a three-component
fluxgate magnetic sensor with a two-component tilt sensor, its electric circuit, an amplifier for the two-component electric field measurement, a temperature sensor and a data recorder.
