红外与毫米波学报2026，Vol.45Issue(1)：137-147,11.DOI:10.11972/j.issn.1001-9014.2026.01.015
基于T法的光谱仪动镜速度复合控制
Moving mirror speed compound control of the Fourier transform spectrometer based on T-method
摘要
Abstract
The Fourier transform spectrometer(FTS)is a precision infrared detection instrument.It adopts Mi-chelson interference splitting,and the moving mirror is one of the core components.The uniformity and stability of the moving mirror's speed directly affect the quality of the subsequent interferogram,so it is necessary to carry out high-precision motion control of the moving mirror.For some FTS with moving mirror in low-speed motion,the traditional M-method can no longer meet the requirements of speed measurement accuracy.In addition,when the moving mirror moves at a low speed,the speed stability is more easily affected by external mechanical distur-bance.Based on the stability requirement of the low-speed moving mirror,this paper studies the motion control of the moving mirror based on the T-method measuring speed.It proposes a high-precision algorithm to obtain the measured and expected value of the velocity.By establishing the mathematical model and dynamic equation of the controlled object,the speed feedforward input is obtained,and then the compound speed controller based on the feedforward control is designed.The control algorithm is implemented by the FPGA hardware platform and ap-plied to the FTS.The experimental results show that the peak-to-peak velocity error is 0.0182,and the root mean square(RMS)velocity error is 0.0027.To test the anti-interference capability of the moving mirror speed control system,the sinusoidal excitation force of 5 mg,7.5 mg,and 10 mg is applied in the moving mirror motion direc-tion on the FTS platform.Under each given magnitude,the scanning of each frequency point in 2~200 Hz is car-ried out.The experimental results show that the peak-to-peak velocity error and the RMS velocity error are propor-tional to the excitation magnitude.Under the 5 mg excitation,the maximum peak-to-peak velocity error is 0.0724,and the maximum RMS velocity error is 0.0225.From a comprehensive analysis of spectrum stability and the sampling interval error of the infrared focal plane detector,the moving mirror velocity uniformity at 5 mg can meet both requirements.This enables the FTS to possess certain anti-interference capability even when ap-plied in micro-vibration environments.This design provides a technical means for realizing the speed control of the moving mirror with low speed and high stability.Also,it makes the FTS have wider applications.关键词
傅里叶光谱仪/速度控制/T法测速/速度前馈/速度均匀性Key words
Fourier transform spectrometer/speed control/T-method/speed feedforward/velocity uniformity分类
信息技术与安全科学引用本文复制引用
黄莹,段娟,郭倩,丁雷,华建文..基于T法的光谱仪动镜速度复合控制[J].红外与毫米波学报,2026,45(1):137-147,11.基金项目
Supported by the National Key Research and Development Program of China(2023YFB3905400) （2023YFB3905400）
