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提出了一种基于双频激光回馈效应的位移测量系统,并在理论和实验两方面进行了研究.实验中对激光器输出功率变化进行了探测,同时对两正交偏振光的光强变化进行了探测.研究发现当被测物体移动时,激光器输出功率受到调制,物体每移动半个光波长时,回馈信号为调制深度相等的两峰,系统分辨率提高了一倍,达到四分之一光波长.当物体运动方向改变时,两正交偏振光的光强变化顺序也随之改变,可以实现物体位移方向的判断.理论分析及模拟结果与实验结果相符合.研究表明该位移传感系统具有结构简单、分辨率高、可判向、测量范围大、可工作于强回馈区等优点.
A displacement measurement system based on dual-frequency laser feedback effect is proposed, and the theoretical and experimental studies are carried out. In the experiment, the output power of the laser is detected, and the changes of the intensity of the two orthogonal polarizations The results show that when the measured object moves, the output power of the laser is modulated. When the object moves by half a wavelength, the feedback signal is two peaks with the same modulation depth. The resolution of the system is doubled to reach a quarter of the light Wavelength.When the movement direction of the object changes, the order of the change of light intensity of the two orthogonal polarized light also changes, which can determine the direction of object displacement.The theoretical analysis and simulation results are in good agreement with the experimental results.The research shows that the displacement sensing system Has the advantages of simple structure, high resolution, decidable, large measuring range, can work in a strong feedback area.