Huazhong University of Science and Technology

Xinyan Yang

Xiaoyan Zeng

Xiangyou Li

Zhongqi Hao

Jiaming Li

Yongfeng Lu

Lianbo Guo

Rongxing Yi

Meng Shen

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)},&#x177;) corresponding to a spectral wavelength &#x175;; S3: performing dynamic searching and filtering near the pixel position coordinate ({circumflex over (x)},&#x177;) 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(I), and S4: calculating a spectral line intensity value after dynamic calibration by summing the adjusted intensity values F(I), 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.

Dynamic calibration method for echelle spectrometer in laser-induced breakdown spectroscopy

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.

Method for inhibiting self-absorption effect in laser-induced breakdown spectroscopy

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Hubei, China

Xinyan Yang