Element isotope analysis system and method based on laser-induced plasma

A plasma and laser-induced technology, applied in thermal excitation analysis, material excitation analysis, material analysis through optical means, etc., can solve problems such as low efficiency, lengthy and complicated detection and analysis process, high sample quality requirements, etc., to solve detection difficulties , analysis results are rapid and accurate, and the process is controllable

Active Publication Date: 2022-01-25
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of this, in order to solve the problems of long and complicated detection and analysis process, low efficiency and high requirements on sample quality in the existing element isotope analysis technology, the present invention proposes an element isotope analysis system and method based on laser-induced plasma

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  • Element isotope analysis system and method based on laser-induced plasma
  • Element isotope analysis system and method based on laser-induced plasma
  • Element isotope analysis system and method based on laser-induced plasma

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Embodiment 1

[0082] like figure 1 As shown, the present invention provides an elemental isotope analysis system based on laser-induced plasma, including an ablation laser light source 1, a detection laser light source 2, a digital synchronous sequence controller, a computer, a mobile platform 5, a spectrum acquisition component 4, a first Optical fiber 8, first photodiode 7, oscilloscope 6 and sample 3.

[0083]The detection laser light source 2 is used as the detection light source, its optical axis coincides with the optical axis of the spectrum acquisition component 4 and is focused on the ablation point where the ablation laser light source 1 ablates the sample. The mobile platform 5 can be controlled by a computer to move along a serpentine path at a constant speed, so as to continuously expose new surfaces at the focal point for laser ablation to generate plasma 30, so as to prevent the ablated surface from being oxidized and affecting the analysis effect. After the pulse of the abl...

Embodiment 2

[0111] Adding paraxial optics to normalize the signal improves the stability of the analysis system

[0112] In order to avoid ablation laser light source 1 (this embodiment adopts Nd:YAG laser 10) during the ablation process, due to the pulse energy, the shaking when the mobile platform 5 is moving, and the unevenness of the surface of the sample 3, the difference in the ablation amount will cause the difference in the spectrum. For the instability of signal strength, this embodiment adds a paraxial optical path 9 to enhance the stability of the detection system.

[0113] like Image 6 As shown, the paraxial optical path 9 includes a beam splitter 91 , a concave lens 92 , a third polarizer 93 , a fourth polarizer 94 , a third convex lens 95 , a second optical fiber 96 and a second photodiode 97 .

[0114] In this embodiment, the detection laser light source 2 adopts a femtosecond laser 20. In the paraxial optical path 9, the femtosecond laser is divided into two beams by a b...

Embodiment 3

[0117] The present invention provides a method for element isotope analysis based on laser-induced plasma, comprising the following steps:

[0118] S1. Assembly of various instruments of the element isotope analysis system

[0119] like figure 1 As shown, an Nd:YAG laser 10 is used as the ablation laser light source 1, and a femtosecond laser 20 is used as the detection laser light source 2. The diode 7 and the oscilloscope 6 are installed in sequence.

[0120] according to figure 2 As shown, the mobile platform 5 is adjusted and connected to a computer, and the mobile platform 5 is returned to zero through computer control. In the present invention, a serpentine moving path is adopted, and the speed and acceleration are respectively set to 5mm / s and 20mm / s 2 , the path spacing is set to 5mm, and the width can be set according to the standard sample diameter. Place the sample 3 on the biaxial manual tilting table 54 and align the optical axis of the Nd:YAG laser 10 with ...

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Abstract

The invention discloses an element isotope analysis system and method based on laser-induced plasma. The system comprises an ablation laser light source, a detection laser light source, a mobile platform, a spectrum acquisition assembly, an optical fiber, a photodiode and an oscilloscope; after the pulse of the ablation laser light source acts on the sample, the surface of the sample is heated, evaporated and expanded, so that a small amount of substances are ejected out, a gaseous substance is formed above the sample, plasma is generated under the collision of free electrons and the subsequent action of the laser pulse, and after the plasma is subjected to 1-2 microseconds, when the plasma in the excited state jumps back to the ground state or the number of thelow-energy-level particlesreaches the maximum, at the moment, the detection laser light source emits a laser pulse, the specific wavelength part of the pulse is absorbed by the ground state or low-energy-level particles, and the intensity of the absorption peak can reflect the abundance of the specific isotope in the sample. The detection process is non-contact, the operation is simple, the process is controllable, and the analysis result is rapid and accurate.

Description

technical field [0001] The invention relates to the technical field of element isotope analysis, in particular to an element isotope analysis system and method based on laser-induced plasma. Background technique [0002] Isotope analysis is widely used in medicine, chemistry, archaeology, geology, materials science, nuclear energy engineering, etc., and provides solutions for research, exploration and solving related problems in these fields. For example, carbon isotope analysis can be used to analyze the environmental evolution based on the carbon cycle, and it can also be used in archaeology or geology to conduct historical and empirical research on human beings or the earth through radiocarbon. In the field of clinical medicine, carbon isotopes 14 C-labeled compounds can be used to evaluate the efficacy of drugs in vivo. In the field of environment and chemical industry, isotopic halogenated compound analysis technology can be used for traceability analysis of organic p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/71
CPCG01N21/718Y02E30/10
Inventor 李嘉铭覃禹智张宁张博元马琼雄郭亮张庆茂
Owner SOUTH CHINA NORMAL UNIVERSITY
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