Method for accurately measuring temperature of combustion gas

A combustion gas, precise measurement technology, applied in thermometers, measuring devices, measuring heat, etc., can solve the problems of narrow spectral range and small number of absorption lines, and achieve high sampling rate, fast optical scanning speed and high measurement accuracy Effect

Active Publication Date: 2020-06-05
BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA
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Problems solved by technology

TDLAS scans a narrow spectral range and covers a small number of absorption lines, so there are certain requirements for the selection of lasers

Method used

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  • Method for accurately measuring temperature of combustion gas
  • Method for accurately measuring temperature of combustion gas
  • Method for accurately measuring temperature of combustion gas

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Embodiment Construction

[0041] In order to better illustrate the purpose and advantages of the present invention, the content of the invention will be further described below in conjunction with the accompanying drawings and examples.

[0042] like image 3As shown, a method for accurately measuring the temperature of the combustion gas disclosed in this embodiment is realized based on the system for accurately measuring the temperature of the combustion gas. The system consists of a first femtosecond optical frequency comb 1 and a second femtosecond optical frequency comb 2 , gas sample cell 3, photodetector 4, data acquisition module 5, analysis and processing module 6, first polarization beam splitter 7, second polarization beam splitter 8, third polarization beam splitter 9, and reflector 10.

[0043] like figure 1 As shown, a method for accurately measuring the combustion gas temperature disclosed in this embodiment, the specific implementation steps are as follows:

[0044] Step 1: Select tw...

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Abstract

The invention discloses a method for accurately measuring the temperature of combustion gas, and belongs to the field of gas temperature measurement. The implementation method comprises: solving the repetition frequency difference of two frequency combs and the pulse time domain repetition period delay time; building measuring light path devices on two sides of the gas sample pool; selecting a gascomponent with absorption spectrum information in an infrared band; adjusting a light path, and determining a mapping relationship and a mapping coefficient between the beat frequency spectrum information and an original spectrum; collecting light intensity data detected by the photoelectric detector; analyzing to obtain frequency spectrum information, and converting to obtain an infrared absorption spectrum of the detected gas; according to an HITRAN database, converting to obtain all internal segmentation summation functions of molecules of the detected gas; substituting the function into an absorption spectrum linear function formula to obtain an absorption spectrum linear function; and substituting the absorption spectrum linear function into a measured gas temperature calculation formula to obtain the temperature of the measured gas, thereby realizing real-time non-contact accurate measurement of the temperature of the combustion gas. The method has the advantages of high real-time performance and high measurement precision.

Description

technical field [0001] The invention relates to a combustion gas temperature measurement method, which belongs to the field of gas temperature measurement. Background technique [0002] In recent years, optical frequency comb technology has played a huge role in the field of frequency standard metrology and frontier basic physics research. Optical frequency combs have a series of spectral lines that are neatly distributed in the frequency domain. These spectral lines are equally spaced, numerous in number, and have a large spectral range. They are natural and precise scales for spectral analysis, and the line width of each scale is very narrow. With high resolution, thanks to these inherent characteristics, optical frequency combs also have important application prospects in the field of spectral measurement. [0003] The current laser temperature measurement methods mainly include the following types: [0004] Laser Raman method: There is a definite correspondence between...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/3504G01K11/00G01K13/02G01K13/024
CPCG01N21/3504G01K11/006G01K13/02
Inventor 张磊武腾飞韩继博赵春播
Owner BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA
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