A method for acquiring water molecule absorption spectrum

Abstract

The invention discloses a water molecule absorption spectrum acquisition method. The method comprises the steps of 1), setting parameters; 2), reading a water molecule absorption spectrum line data set; 3), calculating a parameter corresponding to an ith water molecule absorption spectrum line; 4), calculating a Voigt lineshape of each water molecule absorption spectrum line through a numerical approximation method; and 5) calculating a water molecule absorption spectrum between preset v0 and v1. According to the method, the water molecule absorption spectrum can be effectively obtained without using a high-resolution spectrometer, so that a standard water molecule absorption spectrum can be provided for a cavity enhanced absorption spectrum technology. Meanwhile, the method can effectively calculate relevant changes of the line widths, the intensity and the like of the water molecule absorption spectral lines when environmental conditions (temperature, air pressure and water vapor concentration) and the like are changed, so that the method can be widely used for inversion calculation of a standard water molecule absorption cross section in a relatively wide environment parameter change interval.

Description

technical field [0001] The present application relates to the field of environmental monitoring, in particular to a method for acquiring absorption spectrum of water molecules. Background technique [0002] In the field of environmental monitoring, the absorption spectrum of water molecules is very important for the inversion of the concentration of water molecules. However, due to the large distance between the absorption lines of water molecules and less overlap, the absorption cross section changes very quickly with wavelength. Therefore, to measure the complete absorption spectrum of water molecules in the laboratory, a spectrometer with extremely high resolution is required. From Technically, it is more difficult to realize. Moreover, due to the large range of changes in ambient temperature, humidity, and pressure (for example, when carrying out vertical profile observations, the air pressure changes rapidly with height), to measure the standard absorption spectrum of ...

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Problems solved by technology

However, due to the large distance between the absorption lines of water molecules and less overlap, the absorption cross section changes very quickly with wavelength. Therefore, to measure the complete absorption spectrum of water molecules in the laboratory, a spectrometer with extremely high resolution is required. From It is technically difficult to implement

Moreover, due to the large range of changes in ambient temperature, humidity, and pressure (for example, when carrying out vertical profile observations, the air pressure changes rapidly with height), to measure the standard absorption spectrum of water molecules in the laboratory, it is often necessary to measure the standard absorption spectrum of water molecules at many different temperatures and pressures. Completed under combination, heavy workload

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