空间傅里叶变换红外光谱仪动镜速度稳定性研究

为了改善傅里叶变换红外光谱仪中动镜运动控制系统的动态性能和静态性能，设计了基于扰动观测器的非线性PID控制器。首先对该动镜驱动系统进行数学建模，分析系统中的非线性因素。之后给出了设计该控制器的理论依据。最后进行了数值仿真分析和实验验证。实验结果表明:动镜以133mm/s运动时，采用基于扰动观测器的非线性PID控制器控制时，系统响应超调量为0，上升时间为3ms，稳态均方差为0.0392，性能明显优于传统PID控制器。结果证明了该控制器的可行性和实用性，满足了干涉仪的动镜匀速性要求。

Research on speed stability of moving mirror in FTIR spectrometer

In order to improve static and dynamic performance of moving mirror motion system in Fourier transform infrared spectrometer, nonlinear PID controller based on disturbance observer was designed. Firstly, mathematical model of moving mirror driven system was established, nonlinear factors in the system were analyzed. And then the theoretical basis designing this controller was given. At last, numeral simulation and physical experiment were carried on. The experimental results show that, when moving mirror is moving at 133 mm/s, the maximum overshoot of system is 0, rising time was 3 ms, steady-state variance is 0.039 2 using NPID with DOB, which is obviously better than traditional PID controller. Conclusion shows that NPID with DOB controller is feasible and usable and it meets the requirement uniform motion of moving mirror.