A system for measuring water vapor temperature-variable absorption spectrum and its application method

Abstract

The invention provides a system for measuring water vapor temperature-variable absorption spectrum and its use method, including a difference frequency light source module, a difference frequency light source frequency monitoring and calibration module, a data acquisition and processing module, a three-light path temperature-controlled multi-pass pool device and a matching Gas module; the difference frequency light generated by the difference frequency light source module is introduced into the three-light path temperature-controlled multi-pass cell device, and the absorption information generated by laser injection into the sample cell is imported into the data acquisition and processing module. The gas distribution module is specifically a mixing container for mixing A certain proportion of water vapor and dry air, the data acquisition and processing module includes a computer with an integrated multi-spectral fitting program, by using the new BaGa 4 Se 7 The crystal is used as a frequency conversion device to generate 3~11μm mid-infrared difference frequency light, which is used in conjunction with a three-path temperature-controllable absorption cell, combined with a multi-spectral fitting program, to provide systematic and accurate basic experimental data for atmospheric detection and laser atmospheric transmission research. , can also provide an effective criterion for the improvement of the theoretical calculation model CRB of the spectral parameters of water molecules.

Description

technical field [0001] The invention belongs to the technical field of forming molds, and in particular relates to a system for measuring water vapor temperature-variable absorption spectrum and a method for using the same. Background technique [0002] Water vapor is an important part of the earth's atmosphere and has a wide absorption spectrum. Measuring water vapor temperature-changing absorption spectrum can obtain basic spectral parameters such as the absorption line intensity of the water molecule absorption line, the pressure broadening coefficient and its temperature dependence coefficient. significance. Generally, the specific method for measuring the water vapor temperature-changing absorption spectrum is: pass the water vapor gas sample into the sample cell, precisely control the pressure and temperature of the sample in the sample cell, and then let the laser beam pass through the light hole on the sample cell to obtain the absorption of the sample. Signal; By ...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a system for measuring the water vapor temperature-variable absorption spectrum and its use method for the above-mentioned deficiencies in the prior art, so as to solve the problem that the instrument function of the general Fourier spectrometer proposed in the above-mentioned background technology is relatively large and It is easy to change with time, which not only limits its resolution but also introduces errors in the measurement of water vapor absorption spectra. Measurement methods based on tunable semiconductor lasers can obtain high-resolution, high-frequency standard water vapor absorption spectra, but generally they In addition, when measuring the water vapor absorption spectrum, it is difficult to overcome the pressure measurement error caused by the adsorption of water molecules, which will easily cause the problem of water vapor spectrum inversion error.

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