研究了一种长基线激光干涉仪的在线稳定性监测技术,可用于纳米量级的位移和振动测量。构建了一个臂长22m的激光干涉仪用于位移和振动测量。基于相位生成载波(PGC)解调技术,通过在相位调制载波中增加已知频率、固定幅值的指示信号,利用指示信号的幅度变化,实现激光干涉仪的工作状态监测,以及测量环境的变化与波动的指示。实验结果表明,加入已知幅度频率的指示信号可以实现激光干涉仪在线运行状态的监测。该方法的优点是没有增加硬件负载,可实现激光干涉仪的在线稳定性监测,简化了干涉仪调试过程,提高了运行效率。 The online stability monitoring technique of a long baseline laser interferometer is studied, which can be used to measure the displacement and vibration on the order of nanometers. A 22m-long laser interferometer was constructed for displacement and vibration measurement. Based on the phase-generated carrier (PGC) demodulation technique, the operating conditions of the laser interferometer are monitored by adding known signals of fixed frequency and fixed amplitude to the phase-modulated carrier, and measuring the change of the environment Volatility with the instructions. The experimental results show that adding the indication signal of known amplitude and frequency can realize the online monitoring of the laser interferometer. The advantage of this method is that it can monitor the online stability of the laser interferometer without increasing the hardware load, simplifying the debugging process of the interferometer and improving the operation efficiency.