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提出了一种光源混合频率调制的闭环工作点无源控制方法,通过直接高频调制光源的方式从单路干涉信号中提取出相位漂移信号,并利用低频控制信号对光源直接调制的方式予以补偿。通过高频、低频调制信号的配合,解决了单路干涉信号的工作点跟踪问题,以无源控制的方式保证干涉测量系统始终工作在最灵敏的线性区域。测试了光源在不同调制频率下的调制特性,比较了系统开、闭环状态下工作点的变化趋势,无源闭环工作点控制法与相位载波解调算法的对比解调结果表明,两种方法解调结果相关度超过99%,证明该方法可行。
A passive control method of closed-loop operating point with mixed frequency modulation of light source is proposed. Phase-shifted signal is extracted from single-channel interference signal by direct high-frequency modulation of light source, and the direct modulation of light source is compensated by low-frequency control signal . Through the cooperation of high-frequency and low-frequency modulation signals, the tracking problem of single-channel interfering signal is solved, and the passive control system ensures that the interferometric system always works in the most sensitive linear region. The modulation characteristics of the light source at different modulation frequencies were tested, and the trend of the operating point under the open and closed-loop conditions was compared. The comparison and demodulation results between the passive closed-loop operating point control method and the phase carrier demodulation algorithm showed that the two solutions Adjusting the correlation of the results over 99% proves that the method is feasible.