Design of Temperature Controller Applied Atphotoacoustic Spectrum System

Journal of Atmospheric and Environmental Optics ›› 2016, Vol. 11 ›› Issue (3): 234-240.

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Design of Temperature Controller Applied Atphotoacoustic Spectrum System

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

(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 Online:2016-05-28 Published:2016-05-25

Abstract

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

CLC Number:

TP274

WANG Gao-Xuan, PANG Tao, CUI Xiao-Juan, SUN Peng-Shuai, ZHANG Zhi-Rong, XIA Hua, WU Bian, DONG Feng-Zhong-?. Design of Temperature Controller Applied Atphotoacoustic Spectrum System[J]. Journal of Atmospheric and Environmental Optics, 2016, 11(3): 234-240.

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