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Three-gas-chamber switching device of spectrograph and gas online spectrum testing method

A switching device and spectrometer technology, applied in the direction of color/spectral characteristic measurement, measuring device, instrument, etc., can solve the problem of spectral data loss, and achieve the effect of reducing missed measurement data, improving online real-time performance, and improving analysis accuracy

Active Publication Date: 2014-07-02
XI AN JIAOTONG UNIV
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Problems solved by technology

If the measuring cell is cleaned with background gas and then the background spectrum is scanned again, obviously, due to the long cleaning time, this will lead to loss of spectral data

Method used

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  • Three-gas-chamber switching device of spectrograph and gas online spectrum testing method
  • Three-gas-chamber switching device of spectrograph and gas online spectrum testing method
  • Three-gas-chamber switching device of spectrograph and gas online spectrum testing method

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Embodiment Construction

[0037] Below in conjunction with figure, the present invention is described in further detail:

[0038] Referring to Fig. 2 to Fig. 3, a three-gas chamber switching device of a spectrometer of the present invention includes a first measuring gas chamber 1, a second measuring gas chamber 11 and a background gas chamber 6; the materials, structures and The size is exactly the same, the three gas chambers are all cylindrical, and are all arranged along the detection optical path of the spectrometer; the first measurement gas chamber 1 and the second measurement gas chamber 11 are connected in parallel through the air inlet 20 and the gas outlet 24 on the side of the gas chamber Between the air inlet pipe 4 and the air outlet pipe 5; the air inlets 20 of the first measuring air chamber 1 and the second measuring air chamber 11 are respectively connected in series with a solenoid valve 2 and connected in parallel, and connected with the air inlet pipe 4 through a tee 3 Pass; after ...

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Abstract

The invention discloses a three-gas-chamber switching device of a spectrograph and a gas online spectrum testing method and solves the problems in a spectrum scanning process that a spectrum is not stable due to the change of gas concentrations, an analyzing result is not accurate and baseline drift is caused. The device is provided with three gas chambers which are completely the same, including a gas chamber, another gas chamber and a gas chamber of the gas chamber. In a spectrum scanning process, if one gas chamber is arranged in a light path, a ventilation valve of the gas chamber is closed so that gas in the gas chamber is not at a flowing state; flowing gas to be analyzed passes through the gas chamber to update the gas in the gas chamber. When the spectrum scanning in the gas chamber is finished, the gas chamber is switched into the light path; the ventilation valve of the gas chamber is closed and a valve of the gas chamber of the gas chamber is opened to realize gas updating. If a baseline has the distortion, the gas chamber which is fully filled with background gas is switched into the light path and a background spectrum is scanned again so as to eliminate the change of the background spectrum, caused by environmental changes.

Description

technical field [0001] The invention belongs to the field of online spectrum analysis of gas components and concentrations, and in particular relates to a three-gas chamber switching device of a spectrometer and a gas online spectrum testing method. Background technique [0002] Fourier transform infrared spectroscopy can realize the quantitative analysis of almost all polar gases, and the infrared spectrometer does not consume any materials and does not bring any pollution during the working process, so it is called a "green" instrument. With the development of computer technology and data analysis and processing technology, in recent years, infrared spectrometer has begun to be used in the field of online analysis of gas composition and concentration. However, when the spectral resolution is high and the number of scans is large, the spectral scanning time is longer. For example, a spectral resolution of 1 cm -1 , when the number of scans is 8, the time required to obtai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/01G01N21/31
Inventor 汤晓君程刚寇福林张徐梁刘君华
Owner XI AN JIAOTONG UNIV
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