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Multi-probe gas Raman spectrum system and mixed gas quantitative analysis method

A Raman spectroscopy, mixed gas technology, applied in Raman scattering, material excitation analysis, etc., can solve the problems of losing the timeliness of concentration information, unable to respond to gas sample concentration in real time, increasing cost, etc., achieving excellent portability and reducing deviation and error, the effect of reducing cost

Pending Publication Date: 2022-04-12
OCEAN UNIV OF CHINA
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Problems solved by technology

With the extension of the pipeline, the concentration of the gas sample cannot be reflected in real time; in addition, if it is necessary to add multiple instruments for gas detection when multi-position gas or multi-pipeline gas detection is performed, the cost will be greatly increased; if one instrument is used for multiple If there are only one sampling point, it is necessary to perform time-sharing detection on multiple sample points, which will also lose the timeliness of the concentration information.

Method used

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  • Multi-probe gas Raman spectrum system and mixed gas quantitative analysis method
  • Multi-probe gas Raman spectrum system and mixed gas quantitative analysis method
  • Multi-probe gas Raman spectrum system and mixed gas quantitative analysis method

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Embodiment 1

[0049] Embodiment 1, this embodiment proposes a kind of multi-probe gas Raman spectroscopy system, such as figure 1 As shown, it includes a laser 6, a Raman spectrometer 7, a CCD 8, and a plurality of gas Raman spectroscopy probes. The excitation light holes of the plurality of gas Raman spectroscopy probes are connected to the laser 6 through an excitation optical fiber 4, and the gas Raman spectroscopy probes The signal collection optical path is connected with the Raman spectrometer 7 through the signal collection fiber bundle 5, and then transmitted to the CCD8 for imaging;

[0050]Wherein, the excitation optical fiber 4 is a multi-fiber, and the number of excitation optical fibers 4 is consistent with the number of gas Raman spectroscopy probes; one end of the signal collection optical fiber bundle 5 is divided into multiple branches and connected to the gas Raman spectroscopy probes, The other end is longitudinally arranged in a row and connected to the Raman spectromete...

Embodiment 2

[0055] Embodiment 2, aiming at the spectral data measured by the system described in Embodiment 1, this embodiment proposes a method for quantitative analysis of mixed gas. After quantitative calibration of the system, the signal strength of gases with different concentrations can be obtained by measuring standard samples; for the Raman spectrum of mixed gases, this embodiment preprocesses the Raman spectrum signal, aliasing peak position decomposition method, mixed gas concentration Quantitative methods and other aspects of research, to achieve the precise quantification of the concentration of multi-component analytes in complex gas mixtures, such as image 3 shown, including the following steps:

[0056] Step A, first perform spectral preprocessing, including baseline removal, denoising, removal of abnormal points, etc.;

[0057] Step B, after processing the Raman signal, perform peak search for the Raman signal of the gas to be detected, and then perform aliasing peak dec...

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Abstract

The invention discloses a multi-probe gas Raman spectrum system and a mixed gas quantitative analysis method.The system comprises a laser device, a Raman spectrometer, a CCD and a plurality of gas Raman spectrum probes, exciting light through holes of the gas Raman spectrum probes are connected with the laser device through one-to-many exciting light optical fibers; a signal collection light path of the gas Raman spectrum probe is connected with the Raman spectrometer through an all-in-one signal collection optical fiber bundle, and then is transmitted to a CCD (Charge Coupled Device) for partitioned imaging. When data analysis processing is carried out, firstly, spectrum preprocessing is carried out, including baseline removal, denoising, abnormal point removal and the like; after the Raman signals are processed, peak searching is carried out on the Raman signals of the gas to be detected, and then aliasing peak position decomposition is carried out; and finally, carrying out quantitative analysis on the mixed gas based on a two-stage algorithm of a Bayesian model. According to the scheme, the detection sensitivity is high, the detection sensitivity is improved through a cavity enhancement method, the requirements for high sensitivity and portability can be met at the same time, and the high practical application and popularization value is achieved.

Description

technical field [0001] The technical field of gas detection of the present invention particularly relates to a multi-probe gas Raman spectroscopy system and a quantitative analysis method for mixed gas. Background technique [0002] Gas detection has important application value in the petrochemical field. Gas detection methods include mass spectrometry, chromatography, infrared spectroscopy, and some electrochemical sensors. Among them, mass spectrometry and chromatography require sampling and detection, and in-situ monitoring cannot be realized. Infrared spectroscopy and electrochemical sensors Can only respond to a single gas. [0003] At present, the method of gas chromatography is mostly used. Since the gas chromatography instrument can only be tested in the laboratory, it is necessary to introduce the gas sample into the laboratory for detection. With the extension of the pipeline, the concentration of the gas sample cannot be reflected in real time; in addition, if it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65
Inventor 郭金家杨德旺任立辉孔安栋叶旺全
Owner OCEAN UNIV OF CHINA
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