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In-situ high-pressure confocal Raman spectrum measurement system

A spectrum measurement and Raman spectrometer technology, applied in Raman scattering, material excitation analysis, etc., can solve the problems that changes cannot be observed in real time, complicated and laborious maintenance, complicated operation, etc., to reduce the size and weight of equipment, and to maintain convenient and fast maintenance. , the effect of improving the collection efficiency

Active Publication Date: 2021-06-11
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the integrated confocal Raman system is expensive, occupies a large area, and is relatively complicated to operate
The problem with the simple Raman system is that it cannot isolate the influence of ambient light on the Raman signal, and the experiment must be carried out in a dark room, and it is often a single laser, which cannot realize the free switching of multiple lasers
Both the integrated confocal Raman system and the simple Raman system exist in the process of collecting the sample signal, and the changes of the sample irradiated by the laser cannot be observed in real time. Every time a Raman measurement is performed, the sample position needs to be repositioned under the microscope. Once the internal optical path of the Raman spectrometer is shifted due to mechanical vibration, temperature and humidity changes, or human reasons, the signal will weaken, and the maintenance is more complicated and laborious.

Method used

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  • In-situ high-pressure confocal Raman spectrum measurement system
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  • In-situ high-pressure confocal Raman spectrum measurement system

Examples

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Effect test

Embodiment 1

[0024] Embodiment 1 General structure of the present invention

[0025] This embodiment provides an in-situ high-pressure confocal Raman spectroscopy measurement system, including a laser light source, a Raman spectrometer optical path system, a laser switching system, a dispersion system, and a signal acquisition system.

[0026] The laser light source is used to emit Raman spectrum excitation light.

[0027] The optical path system of the Raman spectrometer is used to focus and irradiate the excitation laser light on the sample to be tested, and at the same time collect the Raman scattered light generated on the sample. Raman spectrometer optical path system of the present invention comprises beam expander 14,15,16, reflection mirror ( figure 1 Mirror 1~mirror 5 in the middle), neutral filter 14, dichroic mirror 26, objective lens 27, total inversion prism, edge filter 35,36,37, lens 39; Incident laser light is through focusing, mirror reflection, through Wheel 25, the dic...

Embodiment 2

[0037] Embodiment 2 Objective lens acquisition system

[0038] Such as figure 2 As shown, the scattered light collected by the objective lens 27 passes through a wheel 25 with five dichroic mirrors 26, which are respectively used at different incident wavelengths. Among them, only the 532nm laser has a dichroic mirror, and the remaining two lasers have multiple dichroic mirrors respectively. Has a dichroic mirror for the low wavenumber range. The oblique incident dichroic mirror 26 can filter the stray light that is larger than the laser wavelength band, so as to ensure that the incident laser light is of a single wavelength. The objective lens 27 is used twice in the Raman spectroscopy system of the present invention. Firstly, the laser light is focused on the sample after passing through the objective lens 27 . After the laser hits the sample, it will scatter and excite Raman scattering. Thereafter, the scattered light (including Rayleigh scattering and Raman scattering)...

Embodiment 3

[0041] Embodiment 3 laser switching system

[0042] Such as image 3 As shown, the structure of the laser switching system 3 has an optical cage assembly 31, the optical cage assembly 31 has a scattered light entrance 32 and a Raman scattered light exit 33; the middle position of the optical cage assembly 31 is equipped with three rotating seats 34 side by side, The first edge filter sheet 35, the second edge filter sheet 36, and the third edge filter sheet 37 are respectively installed along its diameter on the three rotating seats 34; the second edge filter sheet 36 both sides installed in the middle are equipped with Translation total inversion prism (edge ​​3 and edge 4), near the first edge filter plate 35 side of scattered light entrance 32 is equipped with translation total inversion prism (edge ​​1), and the other side is equipped with fixed total inversion prism ( Edge 2), one side of the third edge filter 37 near the Raman scattered light outlet 33 is equipped with ...

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Abstract

The invention discloses an in-situ high-pressure confocal Raman spectrum measurement system, and belongs to the technical field of optical equipment. The structure of the system is provided with a laser light source (1), an objective lens acquisition system (2), a laser switching system (3), a Raman spectrometer (4) and a high-voltage system (5) according to a light path sequence. According to the invention, accurate Raman spectrum measurement can be carried out on a to-be-measured sample; various lasers can be freely added; the system is suitable for in-situ detection of samples under high pressure, and the collection efficiency is improved; the light path offset condition can be observed, and the inner light path can be adjusted in an auxiliary manner; and a laser switching system is designed in a light path, stray light can be strictly suppressed through the closed light path, and the signal-to-noise ratio is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of optical equipment, and relates to a spectrum measurement system, in particular to an in-situ high-pressure confocal Raman spectrum measurement system. Background technique [0002] With the development of high pressure technology, the diamond anvil cell (DAC) can provide up to hundreds of GPa (1GPa=10 9 Pa, normal temperature and pressure is 1.01×l0 5 Pa) pressure and complete in-situ physical property measurement, and the transparency of diamond itself provides us with an optical measurement window under high pressure, which can be used for Raman spectrum measurement of materials. Raman spectroscopy is a kind of scattering spectroscopy that can provide structural information on the vibration and rotation of molecular bonds. It relies on the inelastic scattering of monochromatic light (Raman scattering), and the information of the vibration mode in the system under test can be obtained by measuring the...

Claims

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Application Information

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IPC IPC(8): G01N21/65
CPCG01N21/65
Inventor 李芳菲贾曙帆周强
Owner JILIN UNIV