Chopper stable speed control system based on PID in NIR spectrometer

WANG Zhi-hong; JI Xu-fei; CHEN Chen; ZHANG Fu-dong

doi:10.3788/OPE.20162413.0087

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Chopper stable speed control system based on PID in NIR spectrometer

更新时间：2020-08-13

- Chopper stable speed control system based on PID in NIR spectrometer
- Optics and Precision Engineering Vol. 24, Issue 10s, Pages: 87-93(2016)
- 作者机构：
  
  吉林大学仪器科学与电气工程学院,吉林长春,130026
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20162413.0087
  CLC： TH744.1
- Received：28 May 2016，
  
  Revised：19 June 2016，
  
  Published：14 November 2016
- 稿件说明：
移动端阅览
王智宏, 季绪飞, 陈琛等. 光谱仪调制器PID稳速控制系统[J]. 光学精密工程, 2016,24(10s): 87-93

WANG ZHi-hong, JI Xu-fei, CHEN Chen etc. Chopper stable speed control system based on PID in NIR spectrometer[J]. Editorial Office of Optics and Precision Engineering, 2016,24(10s): 87-93
王智宏, 季绪飞, 陈琛等. 光谱仪调制器PID稳速控制系统[J]. 光学精密工程, 2016,24(10s): 87-93 DOI： 10.3788/OPE.20162413.0087.

WANG ZHi-hong, JI Xu-fei, CHEN Chen etc. Chopper stable speed control system based on PID in NIR spectrometer[J]. Editorial Office of Optics and Precision Engineering, 2016,24(10s): 87-93 DOI： 10.3788/OPE.20162413.0087.

摘要

为了减小光栅扫描型光谱仪调制器的调制信号频率波动，提高光谱检测精度，基于PID技术设计了光谱仪调制器稳速控制系统。调制器稳速控制系统主要包括H桥驱动电路、光耦及整形电路和单片机微控制器3部分。控制系统利用光耦及整形电路、单片机捕获功能实时获取调制器调制频率，并以调制盘一圈内全部齿对应测量频率的平均值与目标频率值之差作为频率误差，利用PID算法计算输出控制信号的控制量，控制单片机的定时计数器产生PWM波，通过H桥电路驱动直流电机，保证调制器调制频率的稳定。实验结果表明，与光谱仪调制器锁相环稳速控制系统对比，PID稳速控制系统的调制器调制频率的波动量由5.67 Hz减小为3.01 Hz，光谱仪信噪比由1 885提高到4 156，有效提高了光谱仪的信噪比，并具有较高的稳定性。

Abstract

In order to reduce the frequency fluctuation of modulating signals of the raster scanning spectrometer modulator and improve the spectrum detection precision

a high-performance stable speed control system based on proportional-integral-derivative (PID) algorithm was proposed. The control system of the modulator mainly comprised the H-bridge drive circuit

optocoupler

voltage comparator and single-chip-machine microcontroller. The modulating frequency of the modulator was monitored in real time through single-chip-machine

optocoupler and voltage comparator. By using the difference between average value of the measuring frequencies corresponding to all teeth in the modulating disk and the target frequency as the frequency error

the control output was calculated via the PID algorithm

regulating the timing counter of the single-chip machine to output the pulse width modulation (PWM) signals. The H-bridge circuit drove the DC motor

ensuring the stability of the modulating frequency. It is verified that the modulating frequency fluctuation decreasing from 5.67 Hz to 3.01 Hz compared with the phase-locked loop control system of spectrometer modulator

and the spectral Signal-to-Noise Ratio(SNR) is effectively improved from 1 885 to 4 156. The proposed PID control system can enhanced the SNR of the spectrometer with considerable stability.

关键词

Keywords

references

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