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在简述非功能型吸收光谱式光纤瓦斯传感器原理的基础上，对光波波长的选择问题进行了讨论，提出一种根据传感器的技术指标确定其基本参数（气室长度Ｌ，光电原件的参数等）的方法，并建立了相应的数学模型．分析表明，增大Ｌ或减少σｉ／ｉ（光电流的测量标准差σｉ与光电流之比）都能起到减少ｃ的测量误差，提高瓦斯探测灵敏度和分辨率的作用．设计时，应首先根据市场情况尽可能地选小σｉ／ｉ，然后再根据传感器的性能指标确定Ｌ．
Based on the principle of non-functional absorption optical fiber gas sensor, the selection of the wavelength of light wave is discussed, and a method of determining the basic parameters (length of gas chamber L, parameters of photoelectric element, etc.) according to the technical specification of the sensor Method, and established the corresponding mathematical model. The analysis shows that the increase of L or decrease of σi / i (the standard deviation of photocurrent measurement σi and photocurrent) can reduce the measurement error of c and improve the gas detection sensitivity and resolution. Design, should be based on market conditions as far as possible, select a small σi / i, and then determine the sensor performance indicators L.