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1.发明授权公开(公告)号：US10267741B2
公开(公告)日：2019-04-23
申请号：US16035072
申请日：2018-07-13
Inventor： Xiangyou Li , Jiaming Li , Lianbo Guo , Xiaoyan Zeng , Yongfeng Lu , Zhongqi Hao , Ran Zhou , Yun Tang , Ping Yang
Abstract: The present invention belongs to the field of laser plasma emission spectrometry, and in particular relates to a method for improving the detection sensitivity on a carbon element in laser-induced breakdown spectroscopy. The method specifically comprises the following steps: ablating the surface of a sample to be tested by using a laser beam emitted so as to rapidly heat the surface of the sample and the ambient air close to the surface of the sample into plasma, atomize carbon in the sample and nitrogen in the ambient gas, and combine carbon with the nitrogen into C—N radicals; tuning a wavelength-tunable laser to a wavelength needed by stimulated absorption transition of C—N radicals, and outputting a laser beam to radiate the plasma so that stimulated absorption transition of C—N radicals is carried out, then fluorescent signals are emitted with spontaneous radiative transition; collecting and recording an emission fluorescence spectrum of the C—N radicals; and qualitatively or quantitatively analyzing on carbon element. By adopting the method provided by the invention, in a case of hardly affecting the matrix spectrum, C—N radical signal can be enhanced in high selectivity, thereby avoiding the interference generated by the matrix, and spectrum signals of the carbon element in the plasma can be enhanced, thereby improving the detective sensitivity of LIBS on carbon element.
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公开(公告)号：US09810634B2
公开(公告)日：2017-11-07
申请号：US15182371
申请日：2016-06-14
Inventor： Lianbo Guo , Jiaming Li , Xiangyou Li , Xiaoyan Zeng , Yongfeng Lu , Rongxing Yi , Xinyan Yang , Zhongqi Hao
CPC classification number: G01N21/718 , G01N21/71 , G01N2201/06113
Abstract: Provided is a method for inhibiting self-absorption effect of a LIBS, comprising ablating a to-be-measured sample via a pulse laser thereby generating plasma, and selectively stimulating the plasma using a wavelength-tunable laser beam enabling transition of particles in a ground-state in the plasma to high energy state as stimulated absorption, thereby improving a stimulated absorption transition efficiency of the particles in a ground-state, and preventing plasma spectrum from being influenced by self-absorption effect. The invention is capable of eliminating the self-absorption effect without introducing external interference, obtaining original characteristics of emission spectrum from the center of the plasma, and essentially inhibiting and finally eliminating the self-absorption effect of laser plasma by making use of intrinsic physical property of plasma.
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公开(公告)号：US12105017B2
公开(公告)日：2024-10-01
申请号：US17289241
申请日：2019-12-16
Inventor： Lianbo Guo , Yuyang Ma , Zhenlin Hu , Xiujuan Hu , Weiliang Wang
CPC classification number: G01N21/1702 , G01N29/2418 , G01N2021/1706 , G01N2291/0423
Abstract: The disclosure discloses a laser opto-ultrasonic dual detection method and device using a pulse laser incident on the surface of a sample to generate plasma and the optical emission and ultrasonic waves are generated, to simultaneously analyze the element compositions, structural defects and residual stress of the sample. The detection system includes an excitation unit, a spectrum detection module, an ultrasonic detection module and an analysis control module. The digital delayer generator is connected to the computer, the high-precision 3D displacement platform is electrically connected to the digital delayer generator. The the pulsed laser is focused on and incident onto the surface of the sample to be tested through modulation of the optical path system to generate plasma, which simultaneously generate optical emission and ultrasonic waves. The ultrasonic detection unit is configured to detect the ultrasonic waves. The spectrum detection unit is configured to detect the plasma emission spectrum.
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