An Improved Resistivity Measurement System Based on Virtual Lock-in Amplifier
This paper designs and studies a hardware and software system for resistivity measurement in a strong noise environment.An improved orthogonal phase-locked amplification algorithm based on Kalman filtering is proposed,combined with constant-current AC detection technology,for resistivity measurement.Using BMn3-12(manganin)material as the target,the improved orthogonal phase-locked algorithm is simulated and validated.Simulation results show that,comparing the results at 0,-10dB,and-20dB,the maximum fluctuation coefficient of the traditional algorithm is 27.21%,while the maximum fluctuation coefficient of the improved algorithm is reduced to 2.86%.The maximum relative error is reduced from 15.20%to 2.29%.Experimental results indicate that the maximum relative errors of the traditional algorithm and the improved algorithm are 16.70%and 2.90%,respectively,and the variances are 2.90×10-3 and 4.11×10-5,respectively.This solution improves the accuracy and precision of resistivity measurements in low signal-to-noise ratio scenarios and enhances the system's anti-interference capability.
virtual orthogonal phase-lockingconstant-current AC detectionKalman filteringresistivity
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