Portable laser raman spectrometer based on prismatic decomposition

Abstract

The invention relates to a portable laser raman spectrometer based on prismatic decomposition. The portable laser raman spectrometer comprises a laser, an optical filter, a prismatic decomposition system, a converging lens group, an area array CCD, an electrical control module, a computer, a power supply and a shell, wherein the laser emitted by the laser irradiates a substance to be tested, the scattered light in the horizontal direction passes through the optical filter to enter the prismatic decomposition system to be subjected to chromatic dispersion, the scattered light subjected to chromatic dispersion is converged on the light sensitive surface of the area array CCD, the area array CCD records a spectrum image, the spectrum image is input into the computer through the electrical control module to be processed into a one-dimensional raman spectrum. According to the spectrometer, the raman scattering light excitation efficiency is improved by adopting 405nm laser, meanwhile, the sensitivity and the signal to noise ratio of the laser raman spectrometer are effectively enhanced by utilizing the characteristics of high utilization rate of prismatic decomposition light, high resolution at a short wave section, and the parallel analysis capability of the area array CCD.

Description

technical field [0001] The invention relates to a Raman spectrum measuring instrument, in particular to a portable laser Raman spectrometer based on prism spectroscopy. Background technique [0002] Raman scattering is a kind of inelastic scattering of incident photons by medium molecules, which was first discovered by C.V. Raman in 1928. Since the Raman spectral features are directly related to the vibration or rotational energy levels of medium molecules, Raman spectral analysis technology has become an effective means for studying the molecular structure of substances and identifying substances. This method does not require pretreatment of the sample and is used for qualitative and quantitative analysis without damage. It has the advantages of simple operation, fast measurement speed, and low sensitivity. It has been widely used in materials, chemicals, petroleum, polymers, biology, and environmental protection. , geology and other fields. [0003] Raman spectrometers a...

AI Technical Summary

Problems solved by technology

As a spectroscopic element, the grating has the advantages of high resolution and the formation of a uniform spectrum for calibration and correction, but at the same time there are disadvantages such as large loss of light energy, overlapping spectral levels, and prone to false spectral lines.

At the same time, this type of Raman spectrometer also has the disadvantages of bulky, complex structure and high cost.

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