Small ultraviolet frequency sweeping laser-based resonance Raman spectrum detection system and method

Abstract

The invention discloses a small ultraviolet frequency sweeping laser-based resonance Raman spectrum detection system method. The small ultraviolet frequency sweeping laser based resonance Raman spectrum detection system comprises a small ultraviolet frequency sweeping laser, a main controller and a data analysis system, wherein the small ultraviolet frequency sweeping laser is composed of a pulse semiconductor laser assembly, an optical fiber laser assembly and an ultraviolet frequency sweeping optical assembly; the testing point of a detected object is located in a molecular composition of a material, has the intensity of a stokes Raman line of molecules with the ultraviolet frequency sweeping wavelength corresponding to the resonance Raman excitation wavelength is enhanced by tens of thousands to millions of times, and thus, multiple molecules of a sample, having extremely low concentration, can be detected. The system has the beneficial effects that an electronic-optical fiber integrated structure is adopted, so that an ultraviolet frequency sweeping laser source is miniaturized; an acousto-optic tunable filter is adopted, and thus, the ultraviolet laser frequency can be rapidly adjusted; and according to the ultraviolet frequency sweeping resonance Raman method, fluorescence interference is eliminated, the high-sensitivity resonance Raman detection of the multiple molecules of the sample can be achieved through fast frequency sweeping.

Description

technical field [0001] The invention relates to a laser spectrum detection method, in particular to a resonance Raman spectrum detection method based on a small-scale ultraviolet sweep laser, and belongs to the field of photoelectric detection. Background technique [0002] When the detection object is irradiated with monochromatic detection light, most of the light will be reflected in the original direction, and a small part will be scattered at different angles to form scattered light. In the vertical direction, in addition to the Rayleigh scattering with the same frequency as the original incident light, there are some symmetrically distributed Raman spectral lines with positive and negative frequency shifts with the frequency of the incident light, called Raman scattering. The intensity and frequency shift of the Raman spectral lines are related to the vibration or rotational energy level of the molecular components of the detection object, so Raman spectral analysis ca...

AI Technical Summary

Problems solved by technology

The ultraviolet resonance Raman technology that combines the two can achieve high-sensitivity detection of a molecular distribution, but it is powerless for the high-sensitivity detection of multiple molecules

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