Optical fiber Raman spectrum gas analysis device

A technology of Raman spectroscopy and gas analysis, which is applied in the field of optical fiber Raman spectroscopy gas analysis devices, can solve the problems of high signal background and low analysis sensitivity of the gas analysis system, so as to avoid Raman fluorescence background, improve signal-to-noise ratio, reduce Effect of signal background and noise

Inactive Publication Date: 2020-07-14
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0005] Aiming at the above defects or improvement needs of the prior art, the present invention provides an optical fiber Raman spectroscopy

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  • Optical fiber Raman spectrum gas analysis device
  • Optical fiber Raman spectrum gas analysis device

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[0032] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0033] Such as figure 1 As shown, the present invention proposes a fiber optic Raman spectroscopic gas analysis device, which includes: a laser 1, a beam coupling device, a gas sample chamber 4, a collimating beam splitting device and a photoelectric imaging receiving device; the beam coupling device It is used to couple the laser light emitted by the laser 1 into the gas sample chamber; the ga...

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Abstract

The invention discloses an optical fiber Raman spectrum gas analysis device, which belongs to the technical field of gas analysis, and comprises a laser, a light beam coupling device, a gas sample chamber, a collimation beam splitting device and a photoelectric imaging receiving device, wherein the light beam coupling device couples the laser into the gas sample chamber; the laser reacts with gasto be detected in the fiber core of the hollow-core optical fiber to generate Raman scattering; the collimation beam splitting device collimates the mixed light beams and then separates out laser, andtransmits the light beams only containing scattering signals to the photoelectric imaging receiving device; and the photoelectric imaging receiving device performs digital spatial filtering on the forward scattering signal to obtain a Raman spectrum of the to-be-detected gas. To-be-detected gas reacts with laser in the hollow-core optical fiber to generate an enhanced Raman scattering signal, thephotoelectric imaging receiving device is used for collecting forward signals and implementing digital spatial filtering, so that background signals of the gas sample chamber are reduced, the problemthat trace components are difficult to detect in Raman gas analysis is solved, and the detection sensitivity of the system is improved.

Description

technical field [0001] The invention belongs to the technical field of gas analysis and detection, and more specifically relates to an optical fiber Raman spectrum gas analysis device. Background technique [0002] The phenomenon in which excitation light is scattered by molecules and the frequency of the scattered light is changed is called Raman scattering. When the intensity of the excitation light is weak, the intensity of the scattered light is proportional to the intensity of the excitation light and the number of scattered molecules. This kind of Raman scattering is often called linear Raman scattering or spontaneous Raman scattering. The linear correlation between the signal intensity and the number of scattered molecules , making Raman scattering widely used in chemical analysis. Due to the relatively small Raman cross-section and molecular number density of gas, the intensity of Raman scattering is very weak, and the gas detection based on Raman spectroscopy is li...

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Application Information

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IPC IPC(8): G01N21/65G01N21/01
CPCG01N21/01G01N21/65
Inventor 白玉思熊东升左都罗王新兵
Owner HUAZHONG UNIV OF SCI & TECH
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