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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。
Aiming at the problem that the wet environment in the coal mine is prone to cause the water in the optical sample cell in the spectral gas sensing system to interfere with the gas detection, a heating type constant temperature control device with the MC9S12XS128 as the control core is designed to stabilize the light in the optical sample Transmission in the pool. The output of the microcontroller PWM signal to control the temperature control circuit, the use of digital temperature sensor SHT11 sample cell actual temperature and compared with the set value, PID algorithm automatically adjusts the duty cycle of the PWM signal, so that the cell temperature stable at Setting value Described in detail the system hardware and software design, and conducted a performance test. The test results show that the control accuracy of the thermostat reaches ± 0.5 ℃, which can improve the working performance of spectral gas sensor.