A tdlas-based gas concentration detection method

A gas concentration detection and gas concentration technology, which is applied in the measurement of color/spectral characteristics, complex mathematical operations, etc., can solve problems such as narrow dynamic range, and achieve the effect of short acquisition interval, accurate output waveform, good linear relationship and sensitivity

Inactive Publication Date: 2020-12-08
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0003] In view of the above, the present invention aims at the problem of narrow dynamic range existing in measuring gas concentration based on TDLAS technology, and provides a gas concentration detection method applicable to the full concentration range and having high sensitivity at the same time

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  • A tdlas-based gas concentration detection method
  • A tdlas-based gas concentration detection method
  • A tdlas-based gas concentration detection method

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Embodiment Construction

[0040] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can understand the principles and characteristics of the present invention.

[0041] In this embodiment, acetylene gas (C 2 h 2 ) as an example, provide a kind of gas concentration detection method based on TDLAS, it is characterized in that, comprise the steps:

[0042] Step A:

[0043] Nitrogen gas is passed into both the reference gas chamber and the gas chamber to be tested, and the wavelength of the laser is modulated between 1532.7nm and 1533.0nm. Obtain the response value V from the reference gas chamber detector respectively 1 and V 2 ; Use the following formula to calculate the loss coefficient j:

[0044]

[0045] In this embodiment, the target dynamic range of the concentration of the gas to be measured is 0% to 100%. It is also possible to select a...

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Abstract

A TDLAS-based gas concentration detection method belongs to the technical field of gas detection. The present invention establishes the modulation depth D m and the waveform diagram of the concentration of the gas to be measured, and extract the peak amplitude A, average value m and its higher power m according to the waveform diagram k The four eigenvalues ​​of , entropy value h and standard deviation s are constructed to obtain a generating function with k-value parameters, and the optimal k value is found based on the dichotomy cycle, so as to obtain the optimal generating function with the best linearity, and further measure the optimal The sensitivity of the generating function is optimized, and the curve of the generating function with the highest sensitivity versus gas concentration is used as the calibration curve for actual measurement. Through multiple calculations, the present invention ensures that the measurement results are close to the real concentration, and can achieve a good linear relationship and sensitivity in the concentration dynamic range of 0% to 100%. The calibration curve obtained by the inversion of the present invention is not only for different gases and different The absorption peaks are applicable, and it has the best linearity and sensitivity for different gases and absorption peaks.

Description

technical field [0001] The invention belongs to the technical field of gas detection, and in particular relates to a TDLAS-based gas concentration detection method. Background technique [0002] Tunable semiconductor laser absorption spectroscopy (TDLAS) technology is a new gas detection method developed on the basis of the combination of diode laser and long optical path absorption cell technology by using laser wavelength modulation to pass through the characteristic absorption region of the gas to be measured. TDLAS technology has the unique advantages of non-invasive in-situ rapid on-line measurement and telemetry, as well as its high response rate, high precision, high sensitivity, multiple selectivity and fast response characteristics, so it presents a good value in gas detection and Application prospect. In the gas sensor based on TDLAS technology, the output wavelength of the semiconductor laser is very narrow (generally less than a few MHz), which is much smaller t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/39G06F17/15
CPCG01N21/39G06F17/15
Inventor 梁志清石锦涛张铭郭泽宇徐灿明刘子骥袁凯
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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