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Method of synchronously measuring pressure, temperature and concentration of flow field in wavelength modulation and absorption method

A technology of wavelength modulation and synchronous measurement, which is applied in the direction of measuring devices, color/spectral characteristic measurement, instruments, etc., can solve the problems of unreliable temperature and component concentration measurement, and achieve the effect of synchronous measurement

Active Publication Date: 2017-04-19
NORTHWEST INST OF NUCLEAR TECH
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a method for synchronously measuring flow field pressure, temperature, and component concentration by using modulated absorption signals, so as to solve the problem of unreliable measurement of temperature and component concentration by TDLAS modulated absorption method under the environment of dynamic pressure changes

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  • Method of synchronously measuring pressure, temperature and concentration of flow field in wavelength modulation and absorption method
  • Method of synchronously measuring pressure, temperature and concentration of flow field in wavelength modulation and absorption method
  • Method of synchronously measuring pressure, temperature and concentration of flow field in wavelength modulation and absorption method

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Embodiment Construction

[0032] The present invention will be further described below in conjunction with the accompanying drawings.

[0033] Such as figure 2 As shown, the method of the present invention uses the width of the wavelength modulation absorption signal to invert the flow field pressure, and then uses the influence curve of the pressure on the intensity of the modulation absorption signal to correct the influence of the pressure on the intensity of the modulation absorption signal, and finally uses the conventional TDLAS two-line method The measurement principle inverts the temperature and component concentrations of the flow field.

[0034] In the temperature measurement of the aero-engine combustion chamber, the pressure and temperature of the combustion flow field are monitored by using the TDLAS technology wavelength modulation absorption method. Typical measurement parameters are: the two absorption lines correspond to the absorption lines of water at 1342.114nm and 1454.826nm resp...

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Abstract

The invention discloses a method of synchronously measuring pressure, temperature and concentration of a flow field in a wavelength modulation and absorption method. The width of wavelength modulation and absorption signals is adopted to invert the pressure of the flow field; an influence curve of the pressure towards the modulation and absorption signal strength is then used for correcting the influence of the pressure towards the modulation and absorption signal strength; and finally, the conventional TDLAS (Tunable Diode Laser Absorption Spectroscopy) double-line method measurement principle is used for inverting the temperature and the component concentration of the flow field. By using the method of the invention, the temperature and the concentration of the flow field under dynamic pressure changes or a high pressure environment can be accurately measured, and the method can also realize synchronous measurement on the pressure of the flow field, and the limitation of the conventional pressure sensor can only realize wall surface pressure measurement is broken through.

Description

technical field [0001] The invention relates to a method for non-contact measurement of flow field parameters, in particular to the detection of gas flow field parameters (pressure, temperature, component concentration, etc.) by using laser absorption spectroscopy technology. Background technique [0002] TDLAS (Tunable Diode Laser Absorption Spectroscopy) technology, that is, tunable diode laser absorption spectroscopy technology. It is based on the narrow line width and fast wavelength tuning characteristics of diode lasers, and realizes the scanning measurement of single or multiple absorption lines of the detection components. By analyzing the physical parameters of the absorption lines, the temperature and concentration of the detection components can be realized. , speed measurement, etc. [0003] The TDLAS wavelength modulation absorption method converts the measurement of the absolute value of the laser light intensity into the measurement of a specific modulation f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D21/02G01N21/39
CPCG01D21/02G01N21/39G01N2021/399
Inventor 陶波胡志云张振荣叶景峰王晟赵新艳
Owner NORTHWEST INST OF NUCLEAR TECH
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