根据信号处理理论,分析了开放式光纤气体传感器吸收池的光信号输出特性,提出了设计吸收池的判据,即腔片上复合光束相邻两光斑不重叠时,其输出特性与White型吸收池等效.在信号处理系统中,采用窄带滤波和相敏检波技术,使传感器的输出特性参数的对数值与待测气体浓度成正比.因此,可按Lambert定律对传感器定标. According to the theory of signal processing, the optical signal output characteristics of the open optical fiber gas sensor absorption cell are analyzed, and the criterion for designing the absorption cell is proposed. That is, when the adjacent two light spots on the cavity plate do not overlap, Equivalent In the signal processing system, the narrowband filter and phase sensitive detection technique are used to make the logarithm of the sensor’s output characteristic parameter proportional to the concentration of the gas to be measured, so the Lambert’s law can be used to calibrate the sensor.