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Raman Spectroscopy Liquid Detection Method Based on Laser Frequency Doubling and Double Hollow-core Fiber

A hollow-core optical fiber and detection method technology, applied in the field of Raman spectroscopy detection, can solve problems such as insufficient sensitivity, error, focusing on a glass slide, etc., and achieve the effects of high measurement efficiency, good coherence, and high reliability

Active Publication Date: 2020-04-21
BEIJING INFORMATION SCI & TECH UNIV
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Problems solved by technology

[0003] However, Raman scattering is a kind of weak scattering, and there is a problem of insufficient sensitivity in practical operation. At present, it is more typical to adopt the method of multi-reflection enhancement. Although the multi-reflection cavity can greatly improve the Raman scattering intensity, many The secondary reflection cavity is enhanced by two high-reflectivity cavity mirrors, which have high requirements for optical path adjustment and system stability
At the same time, if the measurement object is a transparent organic liquid, it is easy to focus on the glass slide due to inaccurate focus
The common Raman detection method only analyzes a single sample, and because the Raman spectral database cannot be updated in time, it brings certain errors, which greatly reduces the measurement efficiency and reliability

Method used

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  • Raman Spectroscopy Liquid Detection Method Based on Laser Frequency Doubling and Double Hollow-core Fiber
  • Raman Spectroscopy Liquid Detection Method Based on Laser Frequency Doubling and Double Hollow-core Fiber
  • Raman Spectroscopy Liquid Detection Method Based on Laser Frequency Doubling and Double Hollow-core Fiber

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Embodiment Construction

[0030] The objects and functions of the present invention and methods for achieving the objects and functions will be clarified by referring to the exemplary embodiments. However, the present invention is not limited to the exemplary embodiments disclosed below; it can be implemented in various forms. The essence of the description is only to help those skilled in the relevant art comprehensively understand the specific details of the present invention.

[0031] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the drawings, the same reference numerals represent the same or similar components, or the same or similar steps.

[0032] figure 1 and figure 2 A system composition diagram 100 and a step flow chart 200 of the liquid detection method based on the fiber laser pumping of the hollow core fiber enhanced Raman spectroscopy of the present invention are shown respectively. The system composition diagram 10...

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Abstract

The invention provides a Raman spectrum liquid detection method based on laser frequency doubling and dual hollow-core fibers. A continuous laser with the wavelength of 915 or 976 nanometers is used as a light source, a laser resonant cavity comprising a first fiber Bragg grating and a second fiber Bragg grating is used, narrow-line-width 532 nanometer laser is further acquired by an active fiber and lithium triborate frequency doubling crystals, and reference liquid and liquid to be detected in the dual hollow-core fibers are respectively excited to generate Raman scattering light. Besides, the liquid detection method has the advantages of less longitudinal modes, good coherence, high measuring efficiency, high reliability and the like.

Description

technical field [0001] The invention relates to a Raman spectrum detection method, in particular to a Raman spectrum liquid detection method based on laser frequency doubling and double hollow-core optical fibers. Background technique [0002] Raman spectrum is a kind of scattering spectrum. Raman spectroscopy is based on the Raman scattering effect discovered by Indian scientist C.V. Raman (Raman). It analyzes the scattering spectrum different from the frequency of the incident light to obtain molecular vibration and rotation information, and is applied to the study of molecular structure. a method of analysis. In terms of liquid detection, Raman spectroscopy has technical advantages such as short analysis period, simple device, and the ability to detect multiple liquids at the same time. be widely used. [0003] However, Raman scattering is a kind of weak scattering, and there is a problem of insufficient sensitivity in practical operation. At present, it is more typica...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/65
CPCG01N21/658
Inventor 张雯祝连庆姚齐峰娄小平董明利李红何巍
Owner BEIJING INFORMATION SCI & TECH UNIV
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