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 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.