Temperature correction method of water molecule absorption coefficient

Abstract

The invention provides a temperature correction method of a water molecule absorption coefficient. The preparation method comprises the following steps: acquiring a ratio K1 of the value of a water molecule partition function at a 296 K part to the value of a water molecule partition function at a preset temperature T part by adopting a polynomial interpolation method; and calculating a ratio K2[i] for each absorption line (it is assumed that a number thereof is i) to compensate the changes, caused by the fact that the preset temperature T is different from the reference temperature 296 K, that is, (1) the change of a ratio of a water molecule on a ground state level, and (2) the change of a difference in proportions of water molecules on a ground state level and an excited state level related to the absorption line. According to the temperature correction method of the water molecule absorption coefficient, under the condition that a high resolution spectrograph does not need to be used, the absorption spectra of water molecules under the conditions of different temperatures, humidity and pressures are effectively obtained, so that a standard water molecule absorption spectrum isprovided for a cavity enhanced absorption spectroscopy technology to be used for concentration retrieving of water molecules.

Description

technical field [0001] The present application relates to the field of environmental monitoring, in particular to a temperature correction method for the absorption coefficient of water molecules. Background technique [0002] In the field of environmental monitoring, obtaining 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 st...

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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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