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Gas temperature and concentration online measuring method based on first harmonic signal

A measurement method and technology of gas temperature, applied in measurement devices, color/spectral characteristic measurement, instruments, etc., can solve problems such as increasing measurement cost and difficulty, measurement error, etc.

Active Publication Date: 2012-09-19
北京新叶科技有限公司
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Problems solved by technology

However, compared with the traditional direct absorption method, so far, the research on the measurement of the integral value of the gas absorptivity function by the wavelength modulation method is still blank, and scientific researchers generally determine it based on the second harmonic peak and complex calibration experiments. The temperature and concentration of the gas to be measured, the calibration experiment not only increases the measurement cost and difficulty, but also brings measurement errors

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  • Gas temperature and concentration online measuring method based on first harmonic signal
  • Gas temperature and concentration online measuring method based on first harmonic signal
  • Gas temperature and concentration online measuring method based on first harmonic signal

Examples

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experiment example

[0080] 1) The experimental example uses NH 3 Mixed gas with air as an example, measure NH 3 The concentration of the molecular absorption line center frequency ν is selected in the HITRAN database 0 6529.184cm -1 ;

[0081] 2) With the tunable semiconductor laser 5 as the light source, adjust the temperature and current of the laser controller 4, so that the output frequency of the tunable semiconductor laser 5 is stabilized at ν 0 place, and use the wavelength meter 6 to calibrate and monitor;

[0082] 3) The 20Hz low-frequency sawtooth wave generated by the signal generator 1 and the 10kHz high-frequency sine wave generated by the lock-in amplifier 2 are superimposed by the adder 3 and then input to the laser controller 4 to drive the laser generated by the laser at the frequency of the characteristic absorption spectrum line Scanning and modulation occur at , by adjusting the amplitude of the sinusoidal signal, the modulation coefficient m is 0.5, 1.0 and 2.0 respective...

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Abstract

The invention relates to a gas temperature and concentration online measuring method based on a first harmonic signal, which belongs to the technical field of tunable diode laser absorption spectrum (TDLAS). Online measurement of the gas temperature and concentration is realized through the relation between a first harmonic X-axis signal and a first harmonic Y-axis signal and a gas absorption rate functional integral value. The advantages of a direct absorption method in the TDLAS technology are combined with the wavelength modulation method, so that not only is the difficulty that the direct absorption method cannot be applied in a worse environment and a weak absorption condition solved, but also the difficulty that the gas temperature and the gas concentration are determined through a calibration experiment in the measurement of the wavelength modulation method can be solved. Due to the adoption of the method, the measurement precision of the TDLAS technology in the industrial field can be effectively improved, and the application range can be enlarged.

Description

technical field [0001] The invention relates to an online measurement method of gas temperature and concentration based on a first harmonic signal, in particular to directly measuring the gas temperature and concentration by using the relationship between the first harmonic X-axis and Y-axis signals and the integral value of the gas absorption rate function. Background technique [0002] Tunable laser diode absorption spectroscopy (TDLAS) technology is an advanced, non-contact online measurement technology for gas temperature and concentration developed in recent years. This technology uses a laser with a very narrow bandwidth to scan the absorption line of the gas molecules to be measured, which can effectively remove the interference of other lines, and has extremely high wavelength selectivity and sensitivity. Since the 1990s, researchers at home and abroad have carried out a lot of research work on TDLAS technology and applied it to the online measurement of gas temperat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/39G01D21/02
Inventor 丁艳军彭志敏钱能
Owner 北京新叶科技有限公司
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