In this paper, direct phase determination method which is based on the phase-locked loop technique and the null method is proposed for heterodyne-displacement-measuring interferometers. The requirement of the proposed method is to detect high-speed phase changes in the phase shift between two sinusoidal input signals, leading to measuring high-speed displacements in industrial applications. The method is estimated for two situations that include the use of (a) two pure sinusoidal signals from a function generator and (b) two interferometric signals from a heterodyne interferometer, which is integrated to an electro-optic modulator for phase modulation. The experimental results of the method provide the phase-variation-measuring speed with a modulation frequency of 20kHz in the 2.7MHz-input sinusoid. The principle, signal-processing program, experiments and results of the method are presented in the paper.
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