Compact 266nm short-wave ultraviolet Raman spectrometer

Abstract

The invention provides a compact 266nm short-wave ultraviolet Raman spectrometer which comprises a light source, an external light path, a dispersion system, a receiving system and a signal acquisition system. The light source is an all-solid-state 266nm short-wave ultraviolet laser; the external light path comprises a collimating lens, a first reflector, a dichroscope, a beam expander, an opticalfilter, a relay lens, a coupling optical fiber and a shaping optical fiber bundle, the dispersion system comprises a slit, a second reflector, an off-axis parabolic reflector and a plane reflection type grating, the receiving system is a back-illuminated CCD linear array detector, and the signal acquisition system is a computer. The optical fiber bundle is composed of a plurality of optical fibers, one end of the optical fiber bundle is arranged to be an optical fiber array, the other end of the optical fiber bundle is arranged to be linear, the point-to-line optical fiber bundle improves theluminous flux entering a dispersion system and increases the signal-to-noise ratio of the system, and in addition, the Raman spectrometer dispersion method based on the Littrow structure can effectively reduce spherical aberration and improve the resolution of the spectrometer.

Description

technical field [0001] The invention relates to the technical field of spectral analysis, in particular to a compact 266nm short-wave ultraviolet Raman spectrometer. Background technique [0002] Raman spectroscopy is a molecular vibration spectrum. The information of the molecular structure can be obtained through the analysis of the spectrum. Any gaseous, liquid, or solid sample can be spectroscopically determined. The position and intensity information of the characteristic peaks of different substances are different on the spectrum. Fast, simple, repeatable, and more importantly, non-destructive qualitative and quantitative analysis makes Raman spectroscopy a "fingerprint" for substance identification and an important means for structural analysis of organic compounds. [0003] At present, most portable Raman spectrometers use visible light or near-infrared lasers as the excitation light source. The excitation efficiency of Raman spectroscopy is low, and fluorescence in...

AI Technical Summary

Problems solved by technology

[0004] When the Raman excitation wavelength is a short-wave ultraviolet laser, the resolution of the spectral detection system needs to reach less than 0.1nm. The traditional compact dispersion spectrometer has a low luminous flux, which leads to a decrease in sensitivity and affects the detection accuracy.

In addition, when detecting aqueous solutions, the short-wave ultraviolet excitation light source and Raman spectrum signals are strongly absorbed by water, and the Raman signals collected by traditional fiber optic probes are weak, which affects the test sensitivity

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