差分吸收检测和波长调制谐波检测是气体光吸收检测的两种基本方法。
Difference absorption measurement and wavelength modulation harmonic measurement are two fundamental approaches for gas light absorption detection.
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.
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