A method for measuring two-dimensional velocity distribution of gas flow based on laser absorption spectroscopy tomography
A technology of laser absorption spectroscopy and tomography, which is used in fluid velocity measurement, velocity/acceleration/shock measurement, full-field flow measurement, etc.
Active Publication Date: 2020-07-31
BEIHANG UNIV
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Combined with tomographic imaging technology (also known as tomographic imaging technology), researchers have also realized the measurement and reconstruction of the two-dimensional distribution of parameters such as gas temperature and component concentration. However, the gas velocity distribution has not been studied using laser absorption spectroscopy According to reports on measurement and reconstruction, the present invention provides a practical method for measuring and reconstructing the two-dimensional velocity distribution of airflow using laser absorption spectroscopy
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[0039] In this embodiment, given the distribution of state parameters in a square area, and dividing the entire area into 10×10 grids, the parallel beam laser absorption spectrum tomography method is used for numerical simulation, and the reconstruction of the velocity distribution is given result.
[0040] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.
[0041] Step 1, select the center frequency at 7444cm -1 Near H 2 O molecular spectral lines are studied, the characteristic parameters of the spectral lines are obtained according to the HITRAN database, and the line intensity function S(T) of the spectral lines is calculated.
[0042] Step 2, given the temperature, pressure, water vapor concentration, airflow velocity, non-Doppler frequency shift, linear function, etc. in a square area, the square area is evenly divided into 10×10 grids, so The state parameters described above are uniform in...
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The invention provides a laser absorption spectrum tomographic imaging technology-based airflow two-dimensional speed distribution measurement method. The laser absorption spectrum tomographic imagingtechnology-based airflow two-dimensional speed distribution measurement method comprises the following steps of 1, acquiring laser absorption spectrum projection data at a plurality of different angles; 2, discretizing a tested region, and calculating sensitivity matrix of tomographic imaging; 3, building an equation set according to a laser absorption spectrum Doppler frequency shift principle and laser absorption spectrum projection data at different angles; and 4, solving a non-linear equation set to obtain speed distribution. With the method proposed by the invention, measurement in a non-contact mode can be achieved, airflow two-dimensional speed distribution can be built again, and the laser absorption spectrum tomographic imaging technology-based airflow two-dimensional speed distribution measurement method is high in applicability and high in reliability and has very wide application prospect.
Description
technical field [0001] The invention relates to a method for measuring two-dimensional velocity distribution of airflow based on laser absorption spectrum tomography technology, the main content of which is to use laser absorption spectrum tomography technology to measure and reconstruct the distribution of airflow velocity on a two-dimensional plane, It involves laser absorption spectroscopy velocimetry technology, tomographic imaging technology and other fields. Background technique [0002] Laser absorption spectroscopy measurement technology is an important technology for measuring gas environmental state parameters, and is widely used in various fields such as industrial process detection, combustion detection, and atmospheric environment monitoring. Researchers used laser absorption spectroscopy to carry out studies on gas temperature, component concentration, and gas flow velocity on a single path. Combined with tomographic imaging technology (also known as tomograph...
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IPC IPC(8): G01P5/26G01P5/00
CPCG01P5/001G01P5/26
Inventor 徐立军曲前伟曹章常刘勇
Owner BEIHANG UNIV