关键词: 相位差, 零位识别, 扭矩, 激光传感器

Abstract: An identifying and processing method of zero point based on phase difference in the measurement of shaft torque was proposed.In this method, standard sinusoidal signals were generated by two reflective laser probes and the color code.By simultaneous sampling and amplitude normalization, the instantaneous phase difference between two signals was obtained. Then the torque load of the shaft was measured based on phase difference, realizing the zero correction which is difficult under static conditions by using pulse signals. After analyzing the key technologies and parameters of the system, the proposed method in this paper was examined by simulation and experiment, respectively. Both simulated and experimental results show that zero position can be accurately determined by this method without rotating the shaft, which can greatly reduce application requirements in the field.

Key words: Phase difference, Zero position recognition, Torque, Laser sensor