Gas absorptivity online measurement method based on modulation factor

A technology of modulation coefficient and absorption rate, which is applied in the field of online measurement of gas absorption rate, can solve the problems of inability to measure absorption rate in real time and gas parameter measurement errors, and achieve the elimination of the influence of photoelectric magnification and laser intensity, expand the application range, improve Effect of Signal-to-Noise Ratio and Measurement Sensitivity

Active Publication Date: 2014-06-18
北京新叶科技有限公司
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Problems solved by technology

[0006] In order to solve the problem that the wavelength modulation method cannot measure the gas parameter measurement error due to the inability to measure the absorption rate in real time, the pres

Method used

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  • Gas absorptivity online measurement method based on modulation factor
  • Gas absorptivity online measurement method based on modulation factor
  • Gas absorptivity online measurement method based on modulation factor

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Embodiment

[0044] 1) Example to measure CO 2 For example, according to the type of gas to be measured, select CO from the spectral database 2 The center frequency v of the absorption spectrum 0 =6982.0678cm -1 ;

[0045] 2) Using the tunable semiconductor laser 3 as the light source, adjust the temperature and current of the laser controller 2, so that the output frequency of the tunable semiconductor laser 3 is stabilized at the center frequency v 0 place;

[0046] 3) Input the high-frequency amplitude-modulated sinusoidal signal generated by the signal generator 1 to the laser controller 2 to modulate the output frequency of the tunable semiconductor laser 3, and determine the modulation amplitude a and the linear light intensity coefficient i 0 , define the modulation coefficient m=a / γ, where γ is the line width of the spectral line, which is half of the half-width of the characteristic spectral line;

[0047] 4) The laser output from the tunable semiconductor laser 3 is collimat...

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Abstract

The invention discloses a gas absorptivity online measurement method based on a modulation factor, belonging to the technical field of tunable diode laser absorption spectroscopy (TDLAS). The gas absorptivity online measurement method comprises the following steps: firstly, determining the width of an absorption spectral line through a characteristic of a fixed point by using a ratio of a quadratic harmonic wave to a quartic harmonic wave, and figuring out a modulation factor; and then determining a peak absorption rate of the spectrum line according to a ratio of the quadratic harmonic wave to the primary harmonic wave when the modulation coefficient is equal to 0.94. The gas absorptivity online measurement method is simple in principle; the influence of factors such as laser intensity fluctuation and a photoelectric enlargement factor is eliminated, the problem that the absorption rate can not be accurately measured in a wavelength modulation method is effectively solved, and the application range of a TDLAS technology is widened.

Description

technical field [0001] The invention relates to an on-line measurement method of gas absorptivity, in particular to an on-line measurement method of gas absorptivity based on tunable laser diode absorption spectrum technology. Background technique [0002] Tunable diode laser absorption spectroscopy (TDLAS) uses a narrow-band laser to scan the absorption line of the gas, and obtains the concentration of the gas to be measured by analyzing the intensity of the laser absorbed by the gas. Compared with the traditional sampling gas detection technology, TDLAS technology has the advantages of non-contact online measurement, strong selectivity, high sensitivity, and fast response. It can measure the average level of gas concentration in a certain area, and has become the current online gas concentration detection technology. The important development direction and technical mainstream of detection technology. At present, TDLAS mainly includes direct absorption method and waveleng...

Claims

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Application Information

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IPC IPC(8): G01N21/39
Inventor 彭志敏丁艳军蓝丽娟
Owner 北京新叶科技有限公司
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