精密光学斩波控制器设计  

Design of Precision Chopper Controller

作　　者：翟保尊 谷玉海[1] 王吉芳[1] 陶立辉 

机构地区：[1]北京信息科技大学,现代测控技术教育部重点实验室,北京100192

出　　处：《仪表技术与传感器》2016年第3期24-27,共4页Instrument Technique and Sensor

基　　金：北京市教委科研计划重点项目(KZ201311232036)

摘　　要：光学斩波控制器用于对光谱测量中入射光进行斩波调制,使入射光变为按一定频率变化的光信号,并提供参考频率信号,使后续锁相放大器对单色仪分光后的光信号进行锁相放大,实现对微弱光信号的检测。精密光学斩波控制器是微弱光信号测量中的关键部件之一,其斩波频率的稳定度及精确度是影响微弱信号放大的关键因素。以ARM单片机为核心,通过对斩波轮进行高精度转速测量,以分段式增量PID实现直流电机的PWM闭环控制,最终实现斩波轮转速的精密控制。实际应用表明,将该斩波器生成的脉冲作为锁相放大器的参考信号得到了令人满意的效果。An optical chopper controller was used to chop and modulate incident light at the spectrum measurement,making the incident light change into certain frequency optical signal and providing a reference signal,thus making the optical signal processed by monochromator be locked and amplified by the follow-up lock-in amplifier,so as to realize the detection of weak optical signal. A precision chopper controller was one of the key components of the lock-in amplifier in the measurement system of weak optical signal,and the chopping frequency stability and accuracy were the key factors when weak signals were amplified. Taking ARM as the core,through the high precision speed measurement of cut pulsator and the closed loop control of DC motor with the staged and incremental PID algorithm,finally the precisely control of the pulsator＇s rotational speed was realized. Actual application shows that the pulse generated by chopper as the reference signal of lock-in amplifier gains satisfactory effect.

关 键 词：精密 光学斩波器 分段增量式 PID控制 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]