Method for measuring HF high-vibration-state particle number distribution by using low-resolution near-infrared fluorescence spectrum

Abstract

The present invention relates to a technology for measuring HF high-vibration-state particle number distribution by using low-resolution near-infrared fluorescence spectrum, wherein the technology is based on the spontaneous radiation fluorescence spectrum technology, and is a new method for measuring the HF molecule high vibration excitation state energy level particle number distribution. According to the present invention, the method is mainly applied in the technical field of chemical laser test diagnosis, and is produced for simplification of the vibration excitation state particle number distribution measurement in the HF chemical laser system; with the method of the present invention, only the intensities of a plurality of P branch spectrum lines of the HF fundamental frequency spontaneous radiation fluorescence spectrum are subjected to simple adding, and characteristics of simpleness, convenience, high precision, non-invasion and the like are provided; and with the method of the present invention, the rapid measurement on various energy levels of the high vibration excitation state particle number distributions in the HF chemical laser can be achieved.

Description

technical field [0001] The invention relates to a method for measuring an optical cavity of a chemical HF laser. The method of using low-resolution near-infrared fluorescence spectroscopy to measure the particle number distribution of HF high-vibration dynamics can be used to monitor the particle number distribution of HF vibrationally excited molecules, so as to understand the operating performance of HF chemical lasers. [0002] Generally, high vibration dynamic HF molecules mainly come from H atoms and F 2 The chemical reaction of the molecule (the vibration quantum number v of the excited state product HF can reach up to 9), and this reaction is a strong exothermic process, which will lead to an increase in the temperature of the optical cavity, thermal blockage, and a decrease in small signal gain. When there is a large amount of F at the outlet of the combustion chamber nozzle 2 , tends to lead to thermal reactions (H+F 2 ) occur in large numbers. [0003] Therefore,...

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Problems solved by technology

[0012] The HF fundamental frequency radiation (Δv=1) is located in the mid-infrared region and can be measured by a Fourier spectrometer. However, due to the limitation of response sensitivity, the fundamental frequency radiation of high vibration levels with v>=4 is very weak, and can be measured by a Fourier spectrometer. not, so not suitable

[0013] The first HF overtone radiation (Δv=2) is located in the near-infrared region, which can be measured with a near-infrared spectrometer OMA-V, etc., and the response sensitivity is also good, but unfortunately there is a strong absorption band of water vapor in this region (1.4 um), will seriously affect the measurement results, so it is not suitable for

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