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Device for regulating test atmosphere of microscope Raman spectrometer

A micro-Raman and spectrometer technology, applied in the direction of Raman scattering, material excitation analysis, etc., can solve the problems of inappropriateness and loss of Raman signal, and achieve fast and convenient sampling, improve the detection intensity of Raman signal, and change the atmosphere environmental effects

Inactive Publication Date: 2011-04-27
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, the window material itself will also lose the Raman signal from the sample. Therefore, it is obviously inappropriate to use a window-type sample stage to adjust the atmosphere of the sample to be tested for Raman spectroscopy with weak intrinsic signals.

Method used

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  • Device for regulating test atmosphere of microscope Raman spectrometer
  • Device for regulating test atmosphere of microscope Raman spectrometer
  • Device for regulating test atmosphere of microscope Raman spectrometer

Examples

Experimental program
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Effect test

Embodiment 1

[0023] The device of the present invention is used in a HR800 microscopic Raman spectrometer, a 325nm laser is selected, the objective lens is a 50 times UV-transparent objective lens, the numerical aperture N.A=0.8, and the working distance is about 0.3mm. Low-wavenumber Raman signal measurements were performed in a helium atmosphere. Fix the sealing cover on the objective lens, place the sample to be tested, and pre-focus. Fix and seal the sealing flange under the sealing cover and the base of the sample stage with quick-installation screws. The specific gravity of helium is smaller than that of air. Set the air inlet port as the air inlet, and the lower port as the exhaust port. Open the air valve and adjust the flow meter. The helium gas is passed into the sample stage for purging, and the gas flow rate is set to 0.1-0.5L / min, after about 5 minutes, the helium atmosphere in the sample stage reaches a relatively high purity, completely eliminating the interference of air....

Embodiment 2

[0025] The device of the present invention is used in a JY-T64000 three-stage Raman spectrometer system to perform low-wavenumber Raman signal testing in an argon atmosphere. A 633nm laser is used as the excitation light source, a 100x objective lens is selected, the numerical aperture N.A=0.9, and the working distance is about 0.2mm. The specific gravity of argon is greater than that of air, so the lower gas port is set as the argon inlet, and the upper gas port is the exhaust port. Open the gas path valve, set the gas flow rate to 0.1-0.5L / min, and after about 5 minutes, the argon atmosphere with relatively high purity will be reached in the sample stage, completely eliminating the interference of air. Turn on the laser light path, focus and test its Raman spectrum. There is no interference peak of air below 150cm-1.

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Abstract

The invention provides a device for regulating test atmosphere of a microscope Raman spectrometer, and relates to the technical field of microscope Raman spectrometers. The device comprises a sample stage base and an objective lens, wherein a seal flange is fixed on the sample stage base, and a seal ring is arranged between the seal flange and the sample stage base; a seal cover is made of a flexible transparent material, one end of the seal cover is connected with the objective lens, and the other end of the seal cover is fixed on the seal flange; and an air passage upper port is arranged onthe seal cover, and an air passage lower port is arranged on the sample stage base. The device realizes that the objective lens with high numerical aperture and ultra-short work distance can be used in the Raman spectrum test in different atmospheres and intensifies the detection intensity of a Raman signal; a mobile seal embedded sample stage structure design is adopted to ensure that a closed space can be formed between the sample stage and the objective lens, and the sample stage and the objective lens can freely move relatively in three-dimensional direction without any window barrier, and the objective lens can be directly attached to the sample surface; and the upper and lower air passage ports can meet the requirement that gases in different specific gravities sweeping from different directions.

Description

technical field [0001] The invention relates to the technical field of micro-Raman spectrometer testing, in particular to a device for controlling the testing atmosphere of a micro-Raman spectrometer under normal temperature and normal pressure. Background technique [0002] Raman spectroscopy is an important modern spectroscopic technique, which is widely used in physics, chemistry, biology, material science, environmental science, petrochemical and other fields, and is a powerful tool for studying the molecular structure of substances. Raman spectroscopy has the characteristics of less sample demand, less sample damage, simple sample preparation, and micro-optical system can be used to detect micro-regions of samples, and has been increasingly valued by scientific researchers. As a conventional testing instrument, many units in China currently have micro-Raman spectrometers. [0003] When the Raman spectrometer measures a sample with a weak Raman signal at a low wavenumbe...

Claims

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Application Information

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IPC IPC(8): G01N21/65
Inventor 席小庆潘伟
Owner TSINGHUA UNIV
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