Photon counting Raman spectrometer capable of realizing full spectrum direct-reading performance

A Raman spectrometer and photon counting technology, applied in spectrometry/spectrophotometry/monochromator, instruments, scientific instruments, etc., can solve the problems of high production and operation cost, complex structure, and inability to read the full spectrum directly. , to achieve the effect of low production and operation cost, large linear dynamic range and good operation stability

Active Publication Date: 2012-05-02
深圳世绘林科技有限公司
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0029] 1) Raman spectrometers that use simple "charge integration method" for spectral analysis (such as detectors using CCD or CID or PD arrays, etc.), although the purpose of "full-spectrum direct reading" can be achieved, the corresponding "detection "Sensitivity" and "Data Stability" will be considerably limited, "Reading Accuracy" and "Linear Dynamic Range" will also be affected to a certain extent, and there is a serious signal overflow problem
[0030] 2) A Raman spectrometer that uses a simple "photon counting method" to perform spectral analysis in a scanning manner (for example, the detector uses PMT or APD, etc.), although the corresponding "detection sensitivity" and "data stability" can be greatly improved , "reading accuracy" and "linear dynamic range" can also be optimized to a certain extent, but "full-spectrum direct reading" cannot be achieved, and many adva

Method used

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  • Photon counting Raman spectrometer capable of realizing full spectrum direct-reading performance
  • Photon counting Raman spectrometer capable of realizing full spectrum direct-reading performance
  • Photon counting Raman spectrometer capable of realizing full spectrum direct-reading performance

Examples

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Effect test

Embodiment 1

[0066] like figure 1 As shown, a photon counting full-spectrum direct-reading Raman spectrometer is mainly composed of a laser 1, a spectroscopic system 2, a photon counting imaging detector 3, and information processing and display 4:

[0067] Laser 1 is used to output laser to excite the sample to generate characteristic Raman spectrum;

[0068] Spectroscopic system 2 is a dispersion spectroscopic device capable of dispersing composite light into monochromatic light or spectral intensity distribution images;

[0069] The photon counting imaging detector 3 is an image sensor capable of position-sensitive detection and photon counting;

[0070] Information processing and display 4 is used to receive and process optical images, and express the processing and analysis results in various graphic forms that are easy for people or machines to understand;

[0071] The optical connections between the laser 1 and the sample, between the sample and the spectroscopic system 2, and bet...

Embodiment 2

[0089] This embodiment is basically the same as Embodiment 1, except that: on the basis of the photon counting imaging detector 3 described in Embodiment 1, a semiconductor layer can be added between the MCP output terminal and the position-sensitive anode,

[0090] There is a gap between the MCP output terminal and the semiconductor layer, the semiconductor layer is plated on the insulating substrate, and the DC high-voltage power supply is electrically connected to the semiconductor layer through a high-voltage lead wire or a conductive electrode (such as image 3 shown). At this time, the above step S540, that is, the physical process of collecting the electron cloud by the position-sensitive anode, evolves into: the electron cloud first crosses to the semiconductor layer under the action of the accelerating bias electric field, and then is induced to the position-sensitive anode through charge induction.

Embodiment 3

[0092] This embodiment is basically the same as Embodiment 1, the difference is that: on the basis of the Raman spectrometer described in Embodiment 1, the laser 1 can use a variety of different types of laser output devices, which can not only use a single wavelength output laser, Multi-wavelength output lasers, fixed-wavelength lasers, and wavelength-continuous or discretely tunable lasers can also use other excitation light sources that can provide high-intensity light output, thereby deriving a variety of photons based on different lasers or other excitation light sources Counting full-spectrum direct-reading Raman spectrometer.

[0093] For example: when a continuously adjustable wavelength laser is used, the characteristic Raman spectral lines produced by a single material component can be analyzed at a time; when a fixed multi-wavelength laser is used, multiple pairs of characteristic Raman spectral lines produced by multiple material components can be analyzed at the sa...

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Abstract

The invention provides a photon counting Raman spectrometer capable of realizing full spectrum direct-reading performance. The Raman spectrometer is mainly composed of a laser, a beam splitting system, a photon counting imaging detector, and information processing and display. The laser outputs laser to excite a sample to generate a characteristic Raman spectrometer; the beam splitting system carries out dispersion on incident composite light containing the characteristic Raman spectrometer so as to form a spectral intensity distribution image; on the basis of the position sensing detection and photon counting, photon counting imaging detector reconstructs a spectral intensity distribution image in a digitlization mode; and the information processing and display carries out a qualitative quantitative analysis on a sample according to positions and light intensity of all pixels in the digital spectral intensity distribution image. According to the invention, advantages of a photon counting property and a full spectrum direct-reading property are combined; therefore, advantages of low detecting limit, high reading precision, good data stability and large linear dynamic range are realized; and moreover, a plurality of substance components can be analyzed simultaneously; all spectral lines in a working wavelength range can be fully utilized; the working speed is fast; the structure is simple; and the operation stability is good.

Description

technical field [0001] The invention relates to a brand-new Raman spectrometer, that is, a photon counting full-spectrum direct-reading Raman spectrometer based on a "photon counting imaging detector". [0002] The invention is especially suitable for qualitative, quantitative and structural analysis of molecules, crystals and other substances, and can be widely used in many industries and technical fields such as environmental monitoring, food safety, bio-optics, metallurgy and chemical engineering, geological exploration, medicine and health. Background technique [0003] When light irradiates a substance, elastic scattering and inelastic scattering will occur: the scattered light of elastic scattering has the same wavelength as the excitation light, and this scattering is also called Rayleigh scattering; the scattered light of inelastic scattering has a component with a longer wavelength than the excitation light , there are also short components, the long ones are called...

Claims

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Application Information

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IPC IPC(8): G01J3/44
Inventor 缪震华刘敏敏吕权息朱柏方黄涛尹延静杨萍赖胜波
Owner 深圳世绘林科技有限公司
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