A novel method for correcting the effect of the lens-to-sample distance change on the signal intensity in laser-induced breakdown spectroscopy

Ling, Yongsheng; Wang, Yu; Jia, Wenbao; Qing, Shan; Hei, Daqian; Zhang, Jiandong; Zhang, Zhichao; Wang, Zi

doi:10.1039/d3ay00280b

Cited by 3 publications

(3 citation statements)

References 24 publications

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“…The next paper in this section, by Ling et al , described a method for correcting the lens to sample distance change on the signal intensity in LIBS . 86 A correction formula that fits the relationship between the obtained signal intensity and the deviation between the lens to sample distance and the focal length was constructed through a series of experiments based on 18 standard coal samples and validated with three types of unknown coal samples. Compared with the original signal intensity the relative errors between the corrected signal intensity and the signal intensity when the lens to sample distance is equal to the focal length decreased by a factor of more than ten for almost all the elements in the three samples.…”

Section: Organic Chemicals and Materialsmentioning

confidence: 99%

Atomic spectrometry update: review of advances in the analysis of metals, chemicals and materials

Clough,

Fisher,

Gibson

et al. 2023

J. Anal. At. Spectrom.

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Section: Organic Chemicals and Materialsmentioning

confidence: 99%

Atomic spectrometry update: review of advances in the analysis of metals, chemicals and materials

Clough,

Fisher,

Gibson

et al. 2023

J. Anal. At. Spectrom.

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show abstract

“…Therefore, LIBS-based spectrochemical analysis requires understanding the complexity of the interaction between a focused laser pulse and a material surface exposed to air, especially to determine the LIBS signals complicated by the flatness effect. In fact, previous works [8][9][10][11][12][13][14][15][16][17] have been indirectly focused on the effect investigation using a planished surface of a sample to simulate its various flatness via adjusting the laser Focal plane To the Surface Distance (FTSD). As discussed previously [10][11][12][13], changing the surface flatness (namely, changing the FTSD parameter) leads to a difference in laser spot size on the material surface and therefore to a difference in spatial energy distribution of the laser pulse near and on the surface.…”

Section: Introductionmentioning

confidence: 99%

Laser-induced breakdown spectroscopy as a method for millimeter-scale inspection of surface flatness

YE 叶,

LI 李,

ZHANG 张

et al. 2024

Plasma Sci. Technol.

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A non-contact method for millimeter-scale inspection of materials’ surface flatness via Laser-Induced Breakdown Spectroscopy (LIBS) is investigated experimentally. The experiment is performed using a planished surface of an alloy steel sample to simulate its various flatness, ranging from 0 to 4.4 mm, by adjusting the laser focal plane to the surface distance with a step length of 0.2 mm. It is found that LIBS measurements are successful in inspecting the flatness differences among these simulated cases, implying that the method investigated here is feasible. It is also found that, for achieving the inspection of surface flatness within such a wide range, when univariate analysis is applied, a piecewise calibration model has to be constructed due to the complex dependence of plasma formation conditions on the surface flatness, which inevitably complicates the inspection procedure. To solve the problem, a multivariate analysis with the help of Back-Propagation Neural Network (BPNN) algorithms is applied to further construct the calibration model. By detailed analysis of the model performance, we demonstrate that a unified calibration model can be well established based on BPNN algorithms for unambiguous millimeter-scale range inspection of surface flatness with a resolution of about 0.2 mm.

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“…The spectrum of the Al alloy standard sample contained a large amount of characteristic line information. By comparing with the National Institute of Standards and Technology (NIST)[33] database, the characteristic lines of Si, Fe, Mn, Zn, Sn, Pb, Ni, Ti, Cr, and Sr elements in the Al alloy standard sample were identified. The characteristic lines of the major element Al and trace element Na (Na I 588.95/…”

mentioning

confidence: 99%

Research on batch multielement rapid quantitative analysis based on the standard curve-assisted calibration-free laser-induced breakdown spectroscopy method

HAN 韩,

SUN 孙,

ZHANG 张

et al. 2024

Plasma Sci. Technol.

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This paper proposes a batch rapid quantitative analysis method for multi-element by combining the advantages of standard curve (SC) and calibration-free laser induced breakdown spectroscopy (CF-LIBS) technology to achieve synchronous, rapid, and accurate measurement of elements in a large number of samples, namely SC-assisted CF-LIBS. Al alloy standard samples, divided into calibration and test samples, were applied to validate the proposed method. The SC was built on the basis of the characteristic line of Pb, Cr in the calibration sample, and the content of Pb, Cr in the test sample was thereby calculated with a relative error of 6% and 4%, respectively. The SC built by Cr with multiple characteristic lines has better calculation results. The relative contents of 10 elements were calculated by CF-LIBS in the test sample. Subsequently, the SC-assisted CF-LIBS was executed, with the majority of calculation relative errors falling within the range of 2%–5%. Finally, the contents of Al, Na were predicted in the Al alloy. The results demonstrate that it effectively enables the rapid and accurate quantitative analysis of multi-element after a single element SC analysis of the tested samples. Furthermore, this quantitative analysis method was successfully applied to soil and astragalus samples, realizing the accurate calculation of the contents of multi-element. It is thus important to advancing LIBS quantitative analysis and its related applications.

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A novel method for correcting the effect of the lens-to-sample distance change on the signal intensity in laser-induced breakdown spectroscopy

Abstract: Laser-induced breakdown spectroscopy (LIBS) is a promising technique for real-time online coal analysis. The lens-to-sample distance (LTSD) significantly affects the obtained signal intensity as well as the accuracy of the...

Cited by 3 publications

References 24 publications

Atomic spectrometry update: review of advances in the analysis of metals, chemicals and materials

Atomic spectrometry update: review of advances in the analysis of metals, chemicals and materials

Laser-induced breakdown spectroscopy as a method for millimeter-scale inspection of surface flatness

Research on batch multielement rapid quantitative analysis based on the standard curve-assisted calibration-free laser-induced breakdown spectroscopy method

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