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建立了红外甲烷传感器的反射光检测模型,对于检测微弱的光电信号进行了电路的设计,从理论计算和性能研究对比,得出满足传感器中心频率在2 Hz,噪声低,通频带窄,放大倍数大的设计要求。在标定实验的基础上,进行浓度公式的多项式拟合。实现了低浓度的精确测量,高浓度的预警作用。
The model of reflected light detection of infrared methane sensor is established. The circuit design for detecting weak photoelectric signal is carried out. The theoretical calculation and performance comparison show that the proposed method meets the requirement of sensor center frequency at 2 Hz, low noise, narrow pass band, Large design requirements. Based on the calibration experiment, the polynomial fitting of the concentration formula is carried out. Achieve accurate measurement of low concentrations, high concentrations of early warning effect.