大气与环境光学学报 ›› 2016, Vol. 11 ›› Issue (3): 234-240.

• 光电技术 • 上一篇    

基于光声光谱系统温度控制器的设计

王高旋, 庞涛, 崔小娟, 孙鹏帅, 张志荣, 夏滑, 吴边, 董凤忠*   

  1. (中国科学院安徽光学精密机械研究所,安徽省光子器件与材料重点实验室,安徽 合肥 230031)
  • 收稿日期:2015-03-26 修回日期:2015-04-07 出版日期:2016-05-28 发布日期:2016-05-25
  • 通讯作者: 董凤忠(1966-),男,博士,研究员,主要从事新型光纤传感器以及有毒有害气体的快速在线监测等方面的研究。 E-mail:fzdong@aiofm.ac.cn
  • 作者简介:王高旋 (1988-),男, 汉族,安徽省宿州市砀山县人,研究生,研究方向为光电探测与信号处理。
  • 基金资助:

    Supported by Special Fund for Basic Research on Scientific Instruments of the Chinese Academy of Science(中国科学院科研装备研制专项YZ201315 ), National Natural Science Foundation of China(国家自然科学基金项目, 11204320, 11204319, 41405034), National Key Technology Research and Development Program of the Ministry of Science and Technology of China(国家科技支撑计划, 2014BAC17B03)

Design of Temperature Controller Applied Atphotoacoustic Spectrum System

WANG Gaoxuan, PANG Tao, CUI Xiaojuan, SUN Pengshuai, ZhANG Zhirong, XiA Hua, WU Bian, DONG Fengzhong   

  1. (Key laboratory of photonic devices and materials of Anhui Province, Anhui Institute of Optic and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China )
  • Received:2015-03-26 Revised:2015-04-07 Published:2016-05-28 Online:2016-05-25

摘要:

精确控制光声光谱实验系统温度有助于提升系统灵敏度及稳定性。设计的温度控制系统由单片机STC12C5A60S2控制,以铂电阻Pt1000为温度传感器,Pt1000采用四线制接法,有效消除了引线电阻引起的误差,其信号处理电路由仪表放大器AD620构成。介绍了14位高速率模数转换器TLC3574的典型工作电路,参考电压由LM4040提供。半导体制冷片由单片机输出的PWM波控制电流方向及导通时间,实现制冷加热,其驱动电路为场效应管H桥电路。所设计的温度控制器控制范围0~40℃,控制精度达到0.06℃。

关键词: Pt1000 温度传感器, 帕尔贴效应, PID控制, 模数转换器TLC3574

Abstract:

Accurate control of the temperature of photoacoustic systems is helpful to improve the detection sensitivity and stability. The temperature controller is composed of microcontroller STC12C5A60S2 and Temperature sensor Pt1000. The four-wire method of Pt1000 effectively eliminates the error due to the lead resistance. The temperature signal processing circuit adopts instrument amplifier AD620. 14 bit high rate ADC (analog to digital converter) TLC3574 is used to transfer temperature voltage acquired by microcontroller and its reference voltage is provided by LM4040. The driver circuit of Peltier is H-bridge MOSFETS controlled by PWM wave from STC12C5A60S2. The duty ratio of PWM wave determines the current direction and conduction time to realize heating or cooling. The control range of temperature is from 0 ℃ to 40 ℃ and the sensitivity is 0.06 ℃.

Key words: temperature sensor Pt1000, Peltier effect, PID controller, ADC-TLC3574

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