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Laser-induced breakdown spectrum signal enhancement method

A laser-induced breakdown and signal enhancement technology, which is applied in the field of laser induction and spectral analysis technology, can solve the problems of increasing device complexity and instrument construction costs, and achieve the effects of spectral signal enhancement, easy manufacturing, and low cost

Inactive Publication Date: 2020-01-17
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above methods achieve the effect of enhancing the sensitivity of LIBS technology by enhancing the spectral signal of LIBS technology. However, although these methods can obtain a certain enhancement effect, they need to add expensive experimental devices, which increases the complexity of the device and the construction of the instrument. cost

Method used

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Embodiment 1

[0040] A laser-induced breakdown spectrum signal enhancement method is a simple and effective laser-induced breakdown spectrum signal enhancement method, which can be used for actual sample analysis. When signalling, the micro plasma is used as an auxiliary excitation source, and the excitation source is ignited to act on the surface of the sample to be tested to achieve LIBS signal enhancement. When performing sample detection and analysis, in order to enhance the laser-induced breakdown spectrum signal, it is only necessary to set the prepared micro plasma in the avoidance of the sample, and the capacitive micro plasma can realize LIBS signal enhancement.

Embodiment 2

[0042]This embodiment is further optimized on the basis of the above-mentioned embodiments. Further, in order to better realize the present invention, the following arrangement is adopted in particular: the micro-plasma chamber of the micro-plasma adopts a heat-resistant support material, and the micro-plasma The electrode of the body is made of metal, preferably a corrosion-resistant metal, and the micro-plasma uses an inert gas as an excitation carrier gas. When performing micro-plasma production, the micro-plasma cavity of the micro-plasma is made of a heat-resistant support material, preferably arranged in a cubic cavity structure, and the cross-sectional area of ​​the micro-plasma cavity is preferably set to 0.45mm 2 ; The micro-plasma chamber is set facing the sample surface, and one side is equipped with a port for gas input; at the same time, two opposite electrodes are made of corrosion-resistant metal on the upper and lower surfaces of the micro-plasma chamber, and an...

Embodiment 3

[0044] This embodiment is further optimized on the basis of any of the above-mentioned embodiments. In order to better realize the present invention, the following arrangement is adopted in particular: the heat-resistant supporting material is made of ceramic materials, organic polymer materials, glass materials, Any of the quartz materials, when making a micro-plasma cavity, the heat-resistant support material can be made of any one or more of materials such as ceramic materials, organic polymer materials, glass materials, and quartz materials; preferred The heat-resistant support material is made of ceramic material.

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Abstract

The invention discloses a laser-induced breakdown spectrum signal enhancement method. When laser-induced breakdown of a spectrum signal is performed, microplasma is used as an auxiliary excitation source, which acts on the surface of a sample to be tested with the laser at the same time, so as to realize LIBS signal enhancement; the laser-induced breakdown spectrum signal enhancement method is a method of using the microplasma as a new excitation source to achieve signal enhancement; the microplasma has the advantages of small size, high compactness, easy manufacturing, low gas flow rate, lowpower, low temperature portability and the like, and the spectrum signal enhancement of more than 10 times can be realized without adding an additional device. The method plays the signal enhancementrole on main elements, and obvious spectrum signals can be obtained from low-content elements that are difficult to be detected in the sample via the method.

Description

technical field [0001] The invention relates to the fields of spectrum analysis technology, laser induction technology and the like, and specifically relates to a laser-induced breakdown spectrum signal enhancement method. Background technique [0002] Laser-induced breakdown spectroscopy (LIBS) is an atomic emission spectroscopic analysis technique that can realize long-distance detection, multi-element analysis, in-situ measurement, and does not require complex pretreatment of samples. It has been widely used in geological exploration, metallurgical industry, biological analysis, artwork analysis, environmental monitoring, aerospace and other fields. [0003] Sensitivity has been a bottleneck restricting the development of LIBS for a long time. Generally speaking, the sensitivity of LIBS is directly determined by the analyzed elements, and its detection limit (LOD) is generally between several to hundreds of g / mL. Compared with other spectral analysis techniques, the sens...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/73
CPCG01N21/73
Inventor 王旭温煦段忆翔
Owner SICHUAN UNIV
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