Relative phase magnetic field direction indicating devices usefu

Electricity: measuring and testing – Magnetic – Magnetometers

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33361, 324209, 324260, G01R 3302

Patent

active

048663840

ABSTRACT:
An applied magnetic field direction indicating device comprising a magnetic sensor (1) having an omnidirectional characteristic and an output which is non-linearly related to the magnitude of the applied field. The sensor (1) is subjected to two mutually perpendicular sinusoidal magnetic biassing fields of the same frequency and in time quadrature relationship. A characteristic of the output of the sensor (1) is indicative of the direction of the applied field.

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Electronic Letters, vol. 22, No. 14, Jul. 3, 1986, pp. 737-738, article by A. Pantinakis et al., entitled "High sensitivity low-frequency magnetometer using magnetostrictive primary sensing and piezoelectric signal recovery".

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