DEVICE FOR MEASUREMENT OF MAGNETIC FIELD Russian patent published in 1995 - IPC

FIELD: measurement technology. SUBSTANCE: device for measurement of magnetic field includes pulse signal amplifier 9, synchronous demodulator 10, one-element ferroprobe 1 with remagnetization winding 2, signal winding 3 and compensation winding 4, generator 5 of alternating current pulses, integrating amplifier 6, first 7 and second 8 controlled adders and differential amplifier 11. Known self-compensation measurement principle is used in device to exclude dependence of transformation characteristic field-voltage on instability of gain factor of units. For this purpose output of amplifier 11 is coupled to winding 4 of ferroprobe. EFFECT: increased precision of device is obtained by improvement of signal-to-noise ratio across output of differential amplifier including case of usage of one-element ferroprobe. 4 dwg