公开(公告)号：US20190003887A1

公开(公告)日：2019-01-03

申请号：US15771338

申请日：2017-04-24

Applicant: HUAZHONG UNIVERSITY OF SCIENCE AND TECHNOLOGY

Inventor： Xiangyou LI ,  Meng SHEN ,  Zhongqi HAO ,  Xinyan YANG ,  Jiaming LI ,  Xiaoyan ZENG ,  Yongfeng LU

IPC: G01J3/02 ,  G01J3/443 ,  G01J3/18

Abstract: The present invention belongs to the technical field of elemental analysis, and more particularly, relates to a dynamic calibration method for echelle spectrometer in laser-induced breakdown spectroscopy, comprising: S1: collecting a standard light source by using an echelle spectrometer; S2: in combination with a calibration function, calculating a pixel position coordinate ({circumflex over (x)}, ŷ) corresponding to a spectral wavelength ŵ; S3: performing dynamic searching and filtering near the pixel position coordinate ({circumflex over (x)}, ŷ) to obtain a set D of all pixel position coordinates, and adjusting all original intensity values in the set D to obtain intensity values F(Ix,y), and S4: calculating a spectral line intensity value after dynamic calibration by summing the adjusted intensity values F(Ix,y), thereby completing dynamic calibration of the result of the echelle spectrometer. The method in the present invention can overcome the shortcoming, i.e., the existing echelle spectrometer is only calibrated before measurement without solving the spectral line drift during use, increasing the absolute intensity of the wavelength and reducing the detection limit of the quantitative analysis, as well as improving the precision of the quantitative analysis of an element to be analyzed.

公开(公告)号：US20180335388A1

公开(公告)日：2018-11-22

申请号：US16035072

申请日：2018-07-13

Applicant: Huazhong University of Science and Technology

Inventor： Xiangyou LI ,  Jiaming LI ,  Lianbo GUO ,  Xiaoyan ZENG ,  Yongfeng LU ,  Zhongqi HAO ,  Ran ZHOU ,  Yun TANG ,  Ping YANG

IPC: G01N21/71 ,  G01N21/75 ,  G01J3/10

CPC classification number: G01N21/718 ,  G01J3/10 ,  G01N21/6402 ,  G01N21/75

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.

公开(公告)号：US20170010215A1

公开(公告)日：2017-01-12

申请号：US15182371

申请日：2016-06-14

Applicant: HUAZHONG UNIVERSITY OF SCIENCE AND TECHNOLOGY

Inventor： Lianbo GUO ,  Jiaming LI ,  Xiangyou LI ,  Xiaoyan ZENG ,  Yongfeng LU ,  Rongxing YI ,  Xinyan YANG ,  Zhongqi HAO

IPC: G01N21/71

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.

Abstract translation: 本发明提供一种抑制LIBS自吸收效应的方法，包括通过脉冲激光烧蚀待测样品从而产生等离子体，以及使用波长可调的激光束选择性地刺激等离子体，使得能够在地面中转移颗粒 - 将等离子体状态置于高能态作为受激吸收，从而提高基态中颗粒的刺激吸收转变效率，并防止血浆光谱受自吸收效应的影响。 本发明能够在不引入外部干扰的情况下消除自吸收效应，从等离子体的中心获得发射光谱的原始特性，并且通过利用固有的物理性质基本上抑制并最终消除激光等离子体的自吸收效应 的等离子体。