基于TCS208F的氢气体积分数检测仪的设计

Design of hydrogen volume fraction detector based on TCS208F

系统采用微流量气体热导传感器TCS208F进行氢气体积分数检测,设计信号调理电路,并在传感器外部设计环境温度控制电路,以实现传感器的恒温检测。传感器输出的微弱信号经测量电桥调理输出,通过集成芯片AD708进行初级放大,经减法电路进行二次放大,最后把标准电压信号送入单片机C8051F020的测量系统进行后续处理,完成氢气体积分数检测。理论研究和实验表明:该检测仪克服了传统热导传感器检测误差大、环境温度补偿困难等诸多问题,具有广阔的应用前景。

This system uses micro-flow gas thermal conductive sensor TCS208F for hydrogen volume fraction detection. The signal conditioning circuit and environment temperature control circuit in the external of the sensor are designed in order to achieve constant temperature detection. The weak signal outputed by the sensor is sent off through the measuring bridge. It is primarily amplified by the integrated chip AD708, secondary and amplified by the subtraction circuit. Finally the standard voltage signal is carried into the measurement system of MCU C8051F020 for following-up treatment to complete the hydrogen volume fraction detection. Theoretical study and experimental results show that the detector overcomes many difficult problems of the traditional thermal conductive sensor such as large error detection, environmental temperature compensation and so on, it has broad application prospects.