Resonance Raman Spectroscopy Detection System and Method Based on Small Ultraviolet Frequency Sweeping Laser

Abstract

The invention discloses a resonance Raman spectrum detection system and method based on a small-scale ultraviolet sweep laser. The system includes a small ultraviolet frequency-sweeping laser, a main controller and a data analysis system. Among them, the small-scale ultraviolet frequency-sweeping laser is composed of pulsed semiconductor laser components, fiber laser components and ultraviolet frequency-sweeping optical components. In the molecular composition of the substance at the test point of the detection object, the intensity of the characteristic Stokes Raman spectral line of the molecule whose corresponding resonance Raman excitation wavelength is the ultraviolet sweep wavelength will be enhanced by tens of thousands to millions due to the resonance Raman effect Times, so it can detect a variety of molecules in the sample at very small concentrations. The beneficial effect of the present invention is that the integrated electronic optical fiber structure is adopted to realize the miniaturization of the ultraviolet frequency-sweeping laser source; the acousto-optic tunable filter is adopted to realize the rapid adjustment of the frequency of the ultraviolet laser; the ultraviolet frequency-sweeping resonance Raman method , while eliminating fluorescence interference, the resonance Raman high-sensitivity detection of various molecules in 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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