Gas concentration on-line measurement method based on full-width-at-half-maximum integral method

A technology of gas concentration and measurement method, applied in the measurement of color/spectral characteristics, etc., can solve problems such as concentration measurement errors, and achieve the effect of eliminating random errors, expanding the scope of application, and eliminating fitting errors.

Active Publication Date: 2012-11-28
北京新叶科技有限公司
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Problems solved by technology

[0015] In order to solve the problem of the concentration measurement error caused by the inability of the direct absorption method to accurately fit the gas absorption rate curve under weak absorption conditions, the present invention provides an online gas concentration measurement method based on the half-height integral method to further improve gas measurement accuracy, simplifying the measurement process

Method used

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  • Gas concentration on-line measurement method based on full-width-at-half-maximum integral method
  • Gas concentration on-line measurement method based on full-width-at-half-maximum integral method
  • Gas concentration on-line measurement method based on full-width-at-half-maximum integral method

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Embodiment

[0045] 1) The embodiment uses air as an example to measure O in the air 2 Use the pressure sensor 5 and the temperature sensor 6 to measure the pressure P=1.0atm and the temperature T=295K of the gaseous medium 9. Set the laser absorption path length L=135cm, select O from the spectral database 2 Center frequency of absorption spectrum v 0 , Line strength S(T), self-widening coefficient γ self And air widening factor γ air As shown in Table 1:

[0046] Table 1O 2 Molecule 13150.197cm -1 Spectral constant

[0047]

[0048] 2) Using the tunable semiconductor laser 3 as the light source, adjust the temperature and current of the laser controller 2 to stabilize the output frequency of the tunable semiconductor laser 3 at the center frequency v 0 And use the wavelength meter 4 for calibration and monitoring;

[0049] 3) Input the sawtooth signal generated by the signal generator 1 to the laser controller to modulate the laser wavelength so that the laser wavelength is between 13149.80 and...

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Abstract

The invention discloses a gas concentration on-line measurement method based on a full-width-at-half-maximum integral method and belongs to the technical field of tunable diode laser absorption spectroscopy (TDLAS). According to the method, a gas absorption rate curve which is fitted by a direct absorption method is integrated in a full-width-at-half-maximum range near the central frequency of a spectral line, and the concentration of gas to be measured is determined according to an iterative algorithm. The method has the advantages that the problem of concentration measurement errors caused by inaccurate fitting of the gas absorption rate curve of the direct absorption method under the condition of weak absorption can be effectively solved, the measurement accuracy of gas concentration is improved, and an application range of a TDLAS technology is expanded.

Description

Technical field [0001] The invention relates to an online gas concentration measurement method, in particular to an online gas concentration measurement method based on a tunable laser diode absorption spectrum technology. Background technique [0002] Tunable diode laser absorption spectroscopy (TDLAS) uses a narrow-band laser to scan the absorption spectrum of a gas, and obtains the concentration of the gas to be measured by analyzing the intensity of the laser light absorbed by the gas. Compared with traditional sampling gas detection technology, TDLAS technology has the advantages of non-contact online measurement, strong selectivity, high sensitivity, and fast response speed. It can measure the average level of gas concentration in a certain area and has become the current gas concentration online Important development direction and mainstream technology of detection technology. [0003] After the laser passes through the measured gas, the laser transmittance τ(v) can be desc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/39
Inventor 丁艳军彭志敏蓝丽娟
Owner 北京新叶科技有限公司
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