Publication Date:
1980-01-01
Description:
A new method for calibrating induction magnetometers has been investigated theoretically and experimentally. The method is to construct a Wheatstone bridge using the head sensor coil of a magnetometer as one arm and to drive it externally with an electrical oscillator. It has been proved analytically that the voltage output from the load of the bridge is proportional, under appropriate conditions, to the e.m.f. induced in the head sensor coil by an external magnetic field which changes with time in the same manner as the driving voltage of the oscillator. The proof presented here is based on linear circuit theory; a later publication will consider nonlinearities. The amplitude response of the bridge plus amplifier system has been determined experimentally and compared with the amplitude response of the system calculated theoretically, assuming an equivalent circuit of the head sensor. Agreement between theory and experiment is excellent. The calibration method is technically simple and can easily be employed for field work. © 1980, Society of Geomagnetism and Earth, Planetary and Space Sciences. All rights reserved.
Print ISSN:
0022-1392
Topics:
Geosciences
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