Method for analyzing aliased spectra of alkane gases

Abstract

Provided is a method for analyzing aliased spectra of alkane gases, including the following steps: firstly separately acquiring second harmonic signals of specified gases at known gas concentrations and calculating an absorbance of each gas; subsequently constructing a low concentration prediction model regarding second harmonic signals and gas concentrations; next constructing a high concentration prediction model regarding absorbances and gas concentrations, immediately followed by acquiring a second harmonic signal of a gas to be measured with an unknown gas concentration and calculating an absorbance of the gas to be measured; and if an absorbance peak of the gas to be measured is less than or equal to a threshold A0, predicting the gas concentration of the gas to be measured using the low concentration prediction model; otherwise, predicting the gas concentration of the gas to be measured using the high concentration prediction model.

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