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Raman spectrum acquisition system with low background noise

A Raman spectrum and acquisition system technology, applied in Raman scattering, material excitation analysis, etc., can solve the problems of Raman spectrum information flooding and interference, and achieve the effects of reducing interference, increasing luminous flux, and improving signal-to-noise ratio

Inactive Publication Date: 2015-09-09
TIANJIN UNIV
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  • Claims
  • Application Information

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Problems solved by technology

However, the intensity of Raman scattered light is only 10 of the excitation light intensity -6 Therefore, when the traditional Raman spectrum acquisition system collects forward or backward Raman scattered beams, it is easily interfered by strong background noise mainly composed of excitation beams, causing Raman spectral information to be submerged in strong background noise

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Embodiment 1

[0030] A Raman spectroscopy acquisition system with low background noise, see figure 1 , including: continuous laser 1, first filter 2, first converging lens 3, plane mirror 4, sample cell 5, second converging lens 6, third converging lens 7, second filter 8, slit 9. A spectroscopic device 10 and an array detector 11 .

[0031] The CW laser 1 generates a high-power, narrow-linewidth excitation beam, and the first filter 2 is a band-pass filter for filtering the stray light of the CW laser 1 itself. The first converging lens 3 converges the excitation beam, and bends the excitation beam through the plane mirror 4, so that the excitation beam is vertically incident on the sample from above (preferably directly above) the sample cell 5, and the excitation beam is excited at the sample cell 5. Mann scattered beams.

[0032] The linear excited region at the sample cell 5 is imaged at the slit 9 through the second converging lens 6 and the third converging lens 7, the height of th...

Embodiment 2

[0035] A Raman spectroscopy acquisition system with low background noise, see figure 1 with figure 2 , including: continuous laser 1, first filter 2, first converging lens 3, plane mirror 4, sample cell 5, second converging lens 6, third converging lens 7, second filter 8, slit 9. A spectroscopic device 10 and an array detector 11 .

[0036] The continuous laser 1 generates an excitation beam with a center wavelength of 532nm, a power not less than 50mW and a linewidth not greater than 0.6nm. The first optical filter 2 is a bandpass optical filter, which is used to filter out the stray light of the CW laser 1 itself. The first converging lens 3 converges the excitation beam, and bends the excitation beam through the plane mirror 4, so that the excitation beam is vertically incident on the sample from above (preferably directly above) the sample cell 5, and the excitation beam is excited at the sample cell 5. Mann scattered beams. The subsequent optical path mainly collect...

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Abstract

The invention discloses a Raman spectrum acquisition system with low background noise. By collecting side Raman scattering beams, the Raman spectrum acquisition system acquires a Raman spectrum with low background noise. Through non-coaxial design of excitation light path and Raman scattering light collecting light path, the invention overcomes the problem that the traditional Raman spectrum acquisition system is likely to be interfered by excitation beam dominated strong background noise while collecting forward or backward or Raman scattering beams. At the same time, by means of vertically downward incidence of excitation beams from the position over a sample, a linear excited region can be configured, and the linear excited region matches with a slit in height. The Raman spectrum acquisition system provided by the invention makes full use of the effective range of an array detector's detection surface, increases the luminous flux of Raman scattering beams incident to the array detector, and enhances the signal to noise ratio.

Description

technical field [0001] The invention relates to the technical field of spectrum analysis instruments, in particular to a Raman spectrum acquisition system with low background noise. Background technique [0002] Raman spectroscopy is an important molecular spectroscopic detection technology with remarkable features, including: no contact with samples, non-destructive testing, suitable for detection of black samples and water-containing samples, adaptable to harsh detection environments such as high temperature, low temperature and high pressure, etc. Imaging is fast, easy, real-time, and more. At present, Raman spectroscopy is widely used in medicine and pharmacy, chemistry and material science, food science, environmental protection, geological archaeology, forensic identification and other fields, and has become a reliable detection method. [0003] Raman spectroscopy is a spectral detection technology based on the Raman scattering effect. According to the inelastic scatt...

Claims

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Application Information

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IPC IPC(8): G01N21/65
Inventor 王慧捷王洋国宏伟李奇峰
Owner TIANJIN UNIV
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