US 9,810,634 B2
Method for inhibiting self-absorption effect in laser-induced breakdown spectroscopy
Lianbo Guo, Hubei (CN); Jiaming Li, Hubei (CN); Xiangyou Li, Hubei (CN); Xiaoyan Zeng, Hubei (CN); Yongfeng Lu, Hubei (CN); Rongxing Yi, Hubei (CN); Xinyan Yang, Hubei (CN); and Zhongqi Hao, Hubei (CN)
Assigned to Huazhong University of Science and Technology, Wuhan, Hubei (CN)
Filed by HUAZHONG UNIVERSITY OF SCIENCE AND TECHNOLOGY, Wuhan, Hubei (CN)
Filed on Jun. 14, 2016, as Appl. No. 15/182,371.
Claims priority of application No. 2015 1 0392450 (CN), filed on Jul. 7, 2015.
Prior Publication US 2017/0010215 A1, Jan. 12, 2017
Int. Cl. G01J 3/30 (2006.01); G01N 21/71 (2006.01)
CPC G01N 21/718 (2013.01) [G01N 21/71 (2013.01); G01N 2201/06113 (2013.01)] 2 Claims
OG exemplary drawing
 
1. A method for inhibiting a self-absorption effect of laser-induced breakdown spectroscopy (LIBS), including 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 a high energy state as stimulated absorption, thereby improving a stimulated absorption transition efficiency of the particles in the ground-state, and preventing the plasma spectrum from being influenced by the self-absorption effect, the method comprising:
determining a spectral line with a lower level of 0, an upper level of E1, and a wavelength of λ as an observation line, and determining another spectral line with a lower level of 0, an upper level of E2, and a wavelength of λ1 as an excitation line by searching in an atomic spectra database of a to-be-measured element in the to-be-measured sample, E2≠E1;
ablating the to-be-measured sample to generate the plasma using a pulse laser;
stimulating the plasma via a wavelength-tunable laser with a wavelength of λ1, and thus particles in the ground-state of the to-be-measured element in the plasma transition to the upper level of E2; and
observing a plasma emission spectrum with a wavelength of λ emitted from the particles in the ground-state in the upper level of E1, thereby inhibiting the self-absorption effect of the plasma emission spectrum.