对于单个样品，当最佳光程长获取存在较大误差时，应使所选光程长落在大于最佳光程长区域；
For a single sample, the pathlength should be selected in the range that is longer than optimum pathlength if a large pathlength selection error is unavoidable.
基于甲烷气体的红外光谱吸收特性，研究了长光程差分吸收式甲烷气体检测的方法。
Based on the infrared spectrum absorption characterization of methane gas, the long optical distance differential absorption method for methane detection is studied.
设计和制作了一种新型的长光程薄层光谱电化学池。
A new type of thin layer spectroelectrochemical cell with a long optical path length was designed and constructed.
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