A Temperature Correction Method for Absorption Coefficient of Water Molecule

Abstract

A temperature correction method for the absorption coefficient of water molecules, the method comprising: obtaining the ratio K of the value of the partition function of the water molecule at 296K to the value of the partition function of the water molecule at the preset temperature T by means of polynomial interpolation 1 ; For each absorption line (assumed to be numbered i), calculate the following ratio K 2 [i], used to compensate for the change caused by the set temperature T being different from the reference temperature 296K, namely: (1) the proportion change of water molecules in the ground state energy level; (2) related to the absorption line The change in the ratio difference between the water molecules in the ground state and excited state energy levels. Combined with the temperature correction method of the absorption coefficient of water molecules, it is possible to effectively obtain the absorption spectra of water molecules under different temperature, humidity and pressure conditions without using a very high-resolution spectrometer, so that it can be used for techniques such as cavity-enhanced absorption spectroscopy etc. provide the standard absorption spectrum of water molecules for the inversion of the concentration of water molecules.

Description

Technical field [0001] The present application relates to the field of environmental monitoring, and more particularly to a temperature correction method of a water molecule absorption coefficient. Background technique [0002] In the field of environmental monitoring, it is essential to obtain a water molecule absorption spectrum for the concentration of water molecules. However, due to the large spacing of the absorption line of the water molecules, the absorption section is very fast, so it is necessary to measure the complete absorption spectrum of water molecules through the laboratory, requires highly resolution spectrometer, from Technically, it is more difficult. Moreover, due to ambient temperature and humidity, pressure (such as the vertical profile observation, the air pressure varies with high rapid changes), it is necessary to measure the standard absorption spectrum of water molecules in the laboratory, often need to have a lot of different temperatures, stress Comb...

AI Technical Summary

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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