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Method and device for automatically eliminating water vapor interference in Fourier transform infrared spectroscopy gas detection

A technology of Fourier transform and infrared spectroscopy, which is applied in the field of automatic elimination of water vapor interference in Fourier transform infrared spectroscopy gas detection, can solve the problem of affecting the practicality of Fourier transform spectroscopy technology, difficult to meet the needs of rapid measurement, and affecting the measurement of pollutants and other problems, to achieve the effects of automatic control, fast water vapor absorption peak interference, and elimination of water vapor absorption peak interference

Inactive Publication Date: 2017-03-29
TSINGHUA UNIV
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Problems solved by technology

So far there is no automatic and fast method to eliminate water vapor interference in gas detection, which seriously affects the practicability of Fourier transform spectroscopy in gas detection
[0008] In summary, water vapor interference is unavoidable in the detection of gas pollutants and will seriously affect the measurement of pollutants
Existing methods to eliminate water vapor interference are difficult to meet the needs of rapid measurement

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  • Method and device for automatically eliminating water vapor interference in Fourier transform infrared spectroscopy gas detection
  • Method and device for automatically eliminating water vapor interference in Fourier transform infrared spectroscopy gas detection
  • Method and device for automatically eliminating water vapor interference in Fourier transform infrared spectroscopy gas detection

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Embodiment Construction

[0033] The implementation of the present invention will be described in detail below in conjunction with the drawings and examples.

[0034] Existing Fourier transform infrared spectroscopy gas detection systems are generally as follows figure 1 shown. It mainly includes a Fourier transform infrared spectrometer with an interferometer unit 1 and a signal receiving and processing unit 3, a gas cell 2, a computer 4, a pure nitrogen storage tank 5, a gas storage tank to be measured 6, a pressure reducing valve 7 and a pressure reducing valve. Pressure valve 2 8, electronically controlled three-way valve 9, etc., wherein the reflector in the gas cell 2 is connected to the interferometer unit 1 and the signal receiving and processing unit 3, one of the gas storage tank 6 to be measured and the electronically controlled three-way valve 9 Ports are connected and there is a pressure reducing valve 2 8 on the connecting pipeline, the pure nitrogen storage tank 5 is connected to the se...

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Abstract

The invention relates to a method for automatically eliminating vapor interference in Fourier transform infrared spectroscopy gas detection. The method is characterized by comprising the steps of monitoring the vapor concentration in a gas cell in real time from a specified waveband by adopting a tunable laser absorption spectrum technology, automatically introducing pure nitrogen into to-be-detected gas in the gas cell according to the vapor concentration, enabling the vapor concentration of mixed gas in the gas cell to reach a predetermined concentration value, subtracting a vapor reference spectrum under the predetermined concentration acquired in the preliminary measurement by utilizing a subtraction method, eliminating the vapor interference, calculating the concentration of each component in the to-be-detected gas diluted by nitrogen, calculating a dilution ratio of the to-be-detected gas caused by nitrogen according to the vapor concentration values of the gas in the gas cell before and after pure nitrogen is introduced, and calculating the concentration of each component in the to-be-detected gas before being diluted. By adopting the method, the capability of the Fourier transform infrared spectroscopy technology for automatically and rapidly eliminating the vapor interference in the gas detection can be realized, and the unknown polluted gas can be rapidly detected.

Description

technical field [0001] The invention belongs to the field of spectral measurement of a Fourier transform infrared spectrometer, in particular to a method and a device for automatically eliminating water vapor interference in Fourier transform infrared spectroscopic gas detection. Background technique [0002] Industrial development has brought about a substantial increase in my country's gas pollution emissions, posing a great threat to people's health. At present, most of my country's industrial enterprises are in the middle and lower reaches of the value chain, and their investment in pollution monitoring is limited. The detection of many pollution sources mainly falls on the shoulders of environmental monitoring units with limited personnel. This puts forward an urgent need for a method that can conveniently and quickly detect different types of industrial waste gas at the pollution site. [0003] Fourier transform infrared spectroscopy has the advantages of multi-chann...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/39
Inventor 王昕李岩尉昊赟
Owner TSINGHUA UNIV
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