Raman optical spectrum detecting system

Abstract

The invention relates to a Ramon optical spectrum detecting system which comprises laser pulses, a laser focusing part, a Raman scattered light collecting part, an optical grating light split part, an electronic control rotary table and a detecting part, wherein the laser pulses are focused by the laser focusing part and then irradiate a sample; the Raman scattered light collecting part collects excited Raman scattered lights; after being collimated and expanded, the excited Raman scattered lights are incident on the optical grating light split part; the optical grating light split part splits incident lights into different wavelengths and then converges the lights into a point; the optical grating light split part comprises an optical grating which is a splicing optical grating and is fixed on the electronic control rotary table; the electronic control rotary table controls the optical grating to rotate; and the detecting part is arranged at a focus point of emergency rays of the optical grating light split part for detection so as to obtain the light intensity distribution of all spectrums. As the Ramon optical spectrum detecting system adopts the splicing grating, the spectral resolution is increased with the same cost. The system is integrated on a platform, can be used for detecting gas and liquid and has good convenience and generality.

Description

technical field [0001] The invention relates to a spectrum detection system, in particular to a Raman spectrum detection system, which belongs to the field of spectrum detection. Background technique [0002] Raman scattering is an inelastic scattering mechanism in which molecules undergo internal energy changes under the action of strong laser light to change the frequency of scattered light. It belongs to the molecular vibration spectrum, which is related to the type of material and can reflect the characteristic molecular structure of the scattering material. The characteristic peak of Raman scattering spectrum is narrow, which is an important means of substance detection. [0003] However, Raman scattering is an extremely weak process, and its intensity is generally only 10 of the incident light intensity. -10 , so it is very difficult to detect Raman scattering for low concentration substances. Usually some surface enhancement methods are used to detect Raman scatteri...

AI Technical Summary

Problems solved by technology

[0003] However, Raman scattering is an extremely weak process, and its intensity is generally only 10 of the incident light intensity. -10 , so it is very difficult to detect Raman scattering for low concentration substances

Usually some surface enhancement methods are used to detect Raman scattering, but for gases and liquids, these methods are not universal

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