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.