Active field compensation digital ultra-low frequency electromagnetic sensor
A sensor and compensation technology, applied in the field of electromagnetic sensors, can solve the problems of no way to use digital processing technology, electromagnetic sensor performance changes, large electromagnetic field amplitude and phase, etc., to achieve high local test accuracy, overcome influence, and frequency band range wide effect
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[0025] Utilize the SD card 26 to import calibration work parameter tables such as calibration frequency and amplitude into the CPU main processing 24, and the CPU controls the 16Bit A / D module 12 according to its predetermined frequency and amplitude according to the number of calibration frequency points in the calibration parameters to create a The calibrated analog signal sequence is amplified by the calibration amplifier 11 and enters into the calibration coil 10 to establish an alternating magnetic field sequence for calibration inside the electromagnetic sensor.
[0026] The CPU main processor 24 starts the data acquisition system, uses the main induction coil to receive the induction signal generated by the calibration electromagnetic field, and converts the collected signal into a data signal through the amplification processing of the high-precision amplifier 14 and the analog-to-digital conversion of the 24Bit A / D module 15 , stored in the SD card in real time after b...
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