光谱型瓦斯传感器中恒温控制装置设计  

Design of Thermostatic Control System Used in Absorption Spectrum Gas Sensor

作　　者：宫磊[1] 

机构地区：[1]南昌航空大学信息工程学院,南昌330063

出　　处：《煤炭技术》2013年第8期101-103,共3页Coal Technology

摘　　要：针对煤矿井下潮湿环境容易对光谱型瓦斯传感系统中的光学样品池产生水凝而干扰瓦斯探测的问题,设计了一种以单片机MC9S12XS128为控制核心的加热型恒温控制装置来稳定光在光学样品池中的传输。由单片机输出的PWM信号来控制控温电路,利用数字温度传感器SHT11采集样品池实际温度并与设定值比较,通过PID算法自动调节PWM信号的占空比,从而使样品池的工作温度稳定在设定值。详细介绍了系统的软硬件设计,并进行了性能测试。测试结果表明,该恒温装置的控制精度达到了±0.5℃,能够改善光谱型瓦斯传感器的工作性能。A thermostatic control system for absorption spectrum gas sensor was designed to avoid water of condensation on the optical cell of the sensor because of moisture under coal mine. This system used single chip microcomputer MC9S12XS128 as control core ,which PWM output controlled temperature control unit. A digital temperature sensor （SHTll） was used to measure temperature in the sample cell. PID algorithm used the difference between real and expected temperature of sample cell as input parameter to compute duty cycle of PWM signal as to keep the real temperature around the expected. Hardware and Software design of the system were introduced in details. The test result showed that the thermostatic control accuracy of ±0.5℃ was obtained, which could improve the working performance of absorption spectrura gas sensor.

关 键 词：恒温控制 瓦斯检测 单片机 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]