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Raman spectroscopic detection apparatus

A Raman spectrum detection and spectrometer technology, applied in the field of spectrum detection, can solve problems such as unusable, infeasible, weak signal, etc., and achieve the effects of increasing receiving efficiency, improving receiving efficiency, and increasing sensitivity

Active Publication Date: 2017-08-04
CHINA JILIANG UNIV
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Problems solved by technology

Since the signal of Raman scattering itself is very weak, and the direction of Raman scattering light includes all directions in space, in general, when the scattered light is received by the detector, only a small part of the scattered light can be received , the reception efficiency of scattered light is very low
[0003] Increasing the intensity of the laser can increase the intensity of the Raman signal proportionally, however, this method is usually not feasible, because too high laser intensity will severely damage the sample, making the Raman spectrum unstable or even completely unusable

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Embodiment approach

[0042] As a first embodiment of the radially polarized light generator 104, the radially polarized light generator 104 of the present invention is composed of two groups of cone prisms with the same cone angle. The two groups of tapered prisms are concave tapered prism 301 and convex tapered prism 302 respectively. The material of the tapered prism is ordinary optical glass or quartz optical glass. The tapered surface of the tapered prism is coated with a multi-layer film system. The multi-layer film system is composed of multi-layer high-refractive-index films with high refractive index and multi-layer low-refractive-index films with low refractive index. The material of the high refractive index film is one of tantalum pentoxide, titanium dioxide or zirconia. The material of the low refractive index film is one of silicon dioxide, silicon monoxide, aluminum oxide or magnesium fluoride.

[0043] When the power-adjusted excitation beam is incident on the conic line of a sec...

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Abstract

The invention discloses a Raman spectroscopic detection, comprising an excited laser, a narrow-band interference filter, a power-attenuating optical filter, a radial polarized light generator, reflectors, a Rayleigh optical filter, a microscopic lens, a Raman enhanced substrate, a co-focusing pin hole and a receiving spectrometer. According to the invention, a cylindrical light beam generated by the excited laser is converted into directional radial polarized laser light by using the radial polarized light generator; the directional radial polarized laser light is scattered by the Raman enhanced substrate so as to generate directionally-distributed directional Raman scattered light; most of the directional Raman scattered light can be received by the microscopic lens so as to allow the receiving intensity of the scattered light to be increased by 10<2> to 10<4> times compared with the receiving intensity of diffuse scattered light; so the receiving efficiency of Raman scattered light is improved, and the sensitivity of Roman detection is enhanced.

Description

technical field [0001] The invention relates to the technical field of spectrum detection, in particular to a Raman spectrum detection device. Background technique [0002] Raman detection is a fast-growing spectral detection method, which is widely used in chemistry, materials, archaeology, counterfeiting, criminal investigation and other fields. The mechanism of Raman scattering, simply put, is that a beam of laser light is irradiated on the sample to be tested, and then the sample to be tested scatters Raman scattered light, and the Raman scattered light is received by the detector and processed for signal. Since the signal of Raman scattering itself is very weak, and the direction of Raman scattering light includes all directions in space, in general, when the scattered light is received by the detector, only a small part of the scattered light can be received , the reception efficiency of scattered light is very low. [0003] Increasing the intensity of the laser can ...

Claims

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Application Information

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IPC IPC(8): G01N21/65
Inventor 金尚忠井绪峰金怀洲姜丽徐睿陈义孟彦龙
Owner CHINA JILIANG UNIV
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