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Raman spectra measuring device for multi-wavelength laser frequency shift excitation

A technology of Raman spectroscopy and measuring devices, which is applied in the field of precision instruments and detection, can solve problems such as not being suitable for integration, and achieve the effects of improving Raman spectrum acquisition performance, stable wavelength, and ensuring stability

Inactive Publication Date: 2015-05-06
XIAMEN UNIV
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  • Application Information

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Problems solved by technology

Mechanically tunable laser devices have moving parts and are not suitable for integration into portable Raman spectroscopy systems

Method used

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  • Raman spectra measuring device for multi-wavelength laser frequency shift excitation
  • Raman spectra measuring device for multi-wavelength laser frequency shift excitation

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Embodiment Construction

[0046] see figure 1 The device of the present invention includes a first laser 1, a second laser 2, a third laser 3, a first laser control module 4, a second laser control module 5, a third laser control module 6, a fiber optic switch 7, and a Raman probe 8 , a sample to be tested 9, a sample cell 10, a grating spectroscopic module 11, a spectral data acquisition module 12, and an algorithm processing module 13. The first laser 1 includes a laser emitting source 1-1, a thermistor temperature sensor 1-2, a semiconductor refrigerator 1-3, and a photodetector 1-4. The second laser 2 includes a laser emitting source 2-1, a thermistor temperature sensor 2-2, a semiconductor refrigerator 2-3, and a photodetector 2-4. The third laser 3 includes a laser emitting source 3-1, a thermistor temperature sensor 3-2, a semiconductor refrigerator 3-3, and a photodetector 3-4.

[0047] The first laser driver module 4 is connected with the laser emission source 1-1 of the first laser 1 for se...

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Abstract

The invention relates to a Raman spectra measuring device for multi-wavelength laser frequency shift excitation. The Raman spectra measuring device comprises at least two semiconductor lasers used for generating lasers with fixed wavelengths, at least two laser control modules used for controlling parameters of the lasers, a fiber-optical switch used for switching light sources of the semiconductor lasers, a Raman probe used for carrying out focusing excitation on a sample to be detected and collecting Raman optical signals generated by the sample, a sample cell used for placing the sample to be detected, a grating splitting module used for dividing the Raman optical signals on space, a spectral data acquisition module used for carrying out photoelectric conversion on the Raman optical signals and an arithmetic processing module used for analyzing and extracting Raman spectra. The Raman spectra measuring device is capable of overcoming the disadvantages of the common tunable laser of instability, complex device or the like, effectively inhibiting fluorescence interference and realizing Raman spectra detection under strong fluorescence background.

Description

technical field [0001] The invention relates to the technical field of precision instruments and detection. Background technique [0002] Raman spectroscopy has outstanding advantages such as fast detection speed and non-destructive detection. It is a powerful tool for molecular structure research and is widely used in food safety, biomedicine, public safety and other fields. However, the Raman spectroscopy detection process of most foods, drugs, and drugs is often accompanied by strong fluorescence interference. For strong fluorescent samples, the fluorescence will overwhelm the Raman signal, and the presence of fluorescence will seriously affect the identification of the characteristic peaks of the Raman spectrum. Therefore, it is very necessary to suppress the fluorescence during the detection of the Raman spectrum. In addition, the noise and dark current of CCD and other detectors also seriously interfere with the identification of some weak Raman peaks. [0003] At pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65
Inventor 吴景林范贤光许英杰卢仙聪汤明阙靖
Owner XIAMEN UNIV
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