Raman spectral liquid detection method based on laser frequency doubling and hollow-core optical fibers

Abstract

The invention provides a Raman spectral liquid detection method based on laser frequency doubling and hollow-core optical fibers. The method adopts a continuous laser device with the wavelength of 915 nm or 976 nm as a light source and adopts a laser resonant cavity composed of a first optical fiber Bragg grating and a second optical fiber Bragg grating, and furthermore, a narrow-line-width 532 nm laser is obtained through an active optical fiber and a lithium triborate frequency doubling crystal and a to-be-detected liquid is stimulated to generate Raman scattering light; at the same time, the liquid detection method also has the advantages of wide application range, high measuring efficiency, high reliability and the like.

Description

technical field [0001] The invention relates to a Raman spectrum liquid detection method, in particular to a Raman spectrum liquid detection method based on laser frequency doubling and hollow-core optical fiber. 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 typical...

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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

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