Analysis of the impact and research on suppression techniques of crosstalk in acquisition channels on phase-shift laser measuring

We present a phase-shift laser measuring system with a laser intensity modulation frequency of 505 MHz. To mitigate the effects of electrical crosstalk between dual channels on phase-difference measurement, we initially employ traditional fast Fourier transform to compute the amplitude and phase differences between the two channels. Leveraging an approximate model of crosstalk-induced errors in the ranging results and measurements of inter-channel crosstalk in the dual-channel acquisition card, we apply a phase correction algorithm to estimate the true phase difference. Experimental results demonstrate that the ranging error of the calibrated system is less than 0.02 mm, and the phase-difference error is below 0.38 mrad.