Research on Control Technology of Moving Mirror in a Double Pendulum Interferometer

Michelson interferometer is one of the core technologies of time-modulated Fourier transform infrared spectrometer. And the control effect of the interferometer moving mirror has a very important influence on the instrument performance. In this paper, based on the double pendulum interferometer, the control technology of its moving mirror is studied. According to the basic principle of double pendulum interferometer, the general scheme of hardware system design is proposed. And under the guidance of the overall scheme, the modular design of the control system is carried out. There are mainly laser detection modules, main control module, motor drive module, etc. The moving mirror control algorithm is designed in the lower computer software, and the speed of the moving mirror is controlled using the compound control algorithm formed by the combination of incremental PID control and feed-forward control. The control effect of the moving mirror is improved. The upper computer software uses LabVIEW to design and test the control effect of the control system. The test results show that the relative speed error of the moving mirror based on the double pendulum interferometer is better than +/- 0.35%, and the stability is high, which can meet the requirements of the interference system index.