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Polarization-eliminating polarization Raman probe and spectrum detecting method

A technology of linearly polarized light and elliptically polarized light is applied in the field of laser excitation spectrum detection, which can solve the problems of high cost and unsuitable high-power laser.

Inactive Publication Date: 2017-01-04
BEIJING HTNOVA DETECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In order to solve the problems of high cost and unsuitability for high-power lasers in the depolarization processing method in the prior art, the present invention provides a depolarization polarization Raman probe and a spectral detection method

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  • Polarization-eliminating polarization Raman probe and spectrum detecting method
  • Polarization-eliminating polarization Raman probe and spectrum detecting method
  • Polarization-eliminating polarization Raman probe and spectrum detecting method

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Embodiment 1

[0060] figure 2 It is the structural diagram of the depolarized polarized Raman probe in the first embodiment. The depolarized polarization Raman probe includes: a laser 1 , an optical path conversion device 2 , a gathering and collecting device 3 , a coupling filter device 4 , a spectrometer 5 , and a wave plate 6 .

[0061] The laser 1 is used to output a collimated and parallel laser beam, which is linearly polarized or elliptically polarized;

[0062] The optical path conversion device 2 is arranged on the output optical path of the laser beam output by the laser 1, and is used to reflect the laser beam;

[0063] The collecting and collecting device 3 is arranged on one side of the optical path converting device 2 in a manner perpendicular to the laser beam reflected by the optical path converting device 2, and is used to gather the beam reflected by the optical path converting device 2;

[0064] The coupling filter device 4 is arranged on the other side of the optical ...

Embodiment 2

[0073] image 3 is the structure diagram of the depolarized polarized Raman probe in the second embodiment. The difference between Embodiment 2 and Embodiment 1 is that the depolarized polarization Raman probe also includes a purification filter 7 arranged between the laser 1 and the optical path conversion device 2 in a manner perpendicular to the laser beam output by the laser 1, The purification filter 7 can purify laser wavelength components and filter out stray light interference. The wave plate 6 is arranged between the laser 1 and the purification filter 7 in a manner perpendicular to the laser beam output by the laser 1, or the wave plate 6 is arranged in the purification filter 7 in a manner perpendicular to the laser beam output by the laser 1 Between the optical path conversion device 2.

Embodiment 3

[0075] Figure 4 is the structural diagram of the depolarized polarized Raman probe in the third embodiment. The difference between embodiment three and embodiment two is that the depolarized polarization Raman probe also includes a notch filter 8 arranged between the optical path conversion device 2 and the coupling filter device 4, and the notch filter 8 It is used to block the collected Rayleigh scattered light, and to eliminate stray light signals in the interference band.

[0076] Another configuration of the depolarized polarized Raman probe is described below. In Embodiments 1, 2, and 3, the wave plate 6 is arranged on the optical path between the laser 1 and the optical path conversion device 2, while in the following embodiments, the wave plate 6 is arranged between the focal point of the optical path conversion device 2 and the collection device 3 on the light path.

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Abstract

The invention discloses a polarization-eliminating polarization Raman probe and a spectrum detecting method. The probe comprises a laser (1), a light path converting device (2), a gathering collecting device (3), a coupling light filter device (4), a spectrograph (5) and a wave plate (6), wherein the laser (1) is used for outputting collimating parallel laser beams which are linear polarization light or elliptical polarization light; the light path converting device (2) is arranged on the outputting light path, for outputting the laser beams, of the laser (1); the wave plate (6) is arranged on the light path between the laser (1) and the light path converting device (2) or the wave plate (6) is arranged on the light path between the light path converting device (2) and the focal point of the gathering collecting device (3). The polarization-eliminating polarization Raman probe has the advantages that polarization eliminating can be effectively performed on the laser beams, low cost is achieved, size requirements of the laser beams are avoided, and a high damage threshold is achieved.

Description

technical field [0001] The invention relates to the technical field of laser excitation spectrum detection, in particular to a depolarized polarization Raman probe and a spectral detection method. Background technique [0002] Raman spectrum is a kind of scattering spectrum. Raman spectroscopy is based on the Raman scattering effect discovered by Indian scientist C.V. Raman (Raman). It analyzes the scattering spectrum different from the frequency of the incident light to obtain molecular vibration and rotation information, and is applied to the study of molecular structure. a method of analysis. Raman spectroscopy has been rapidly developed and widely used in the field of non-invasive detection due to its sensitivity, rapidity and convenient operation. [0003] In polarized Raman theory, when electromagnetic radiation interacts with a system, the polarization state often changes, and this phenomenon is called depolarization. In Raman scattering, this degree of depolarizat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65
CPCG01N21/65
Inventor 熊胜军夏征
Owner BEIJING HTNOVA DETECTION TECH CO LTD