A Simple Device for Lens-to-Sample Distance Adjustment in Laser-Induced Breakdown Spectroscopy (LIBS)

Cortez, Juliana; Filho, Benedito B. Farias; Fontes, Laiane M.; Pasquini, Célio; Raimundo, Ivo M.; Pimentel, Maria Fernanda; Borba, Flávia de Souza Lins

doi:10.1177/0003702816687571

Cited by 15 publications

(8 citation statements)

References 17 publications

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“…They pointed out that fs laser-produced plasma(LPP) expansion appears to be approximately two times faster than ns LPP expansion for the their experimental conditions. Until recent years, there also have many studies related to the laser focusing conditions effect on laser-induced plasma [19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Lens-to-sample distance effect on the quantitative analysis of steel by laser-induced breakdown spectroscopy

Wang¹,

Li²,

Li³

et al. 2020

J. Phys. D: Appl. Phys.

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The focusing position of the laser affects the characteristics of the laser-induced plasma, which in turn influences the signal stability and the quantitative analysis of laser-induced breakdown spectroscopy. In this study, six standard alloy steels are used as the samples, and the trace elements including Si, Mn, Cr are quantitatively analyzed by internal standard method. The variations of line intensity, background noise intensity, signal-to-background ratio (SBR), detecting sensitivity and detection of limit (LOD) of the element with lens-to-sample distance (LTSD) were investigated. The results show that both the intensities of the analytical line and the background noise reached a maximum when the LTSD is 94 mm. While the corresponding SBR is relatively low. For quantitative analysis, it is observed that the change of the detection sensitivity with LTSD has the similar trend with that of SBR. That is, the detection sensitivity has a lower value when the LTSD is 94 mm. However, when the LTSD changes from 93 mm to 99 mm, LODs of the three elements are maintained at a small value. The present results indicate that for quantitative analysis of LIBS, the intensities of the analytical line and the background noise should be comprehensively considered when optimizing the laser focusing position.

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Section: Introductionmentioning

confidence: 99%

Lens-to-sample distance effect on the quantitative analysis of steel by laser-induced breakdown spectroscopy

Wang¹,

Li²,

Li³

et al. 2020

J. Phys. D: Appl. Phys.

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show abstract

“…Thus, the emission spectrum detected in the early regimes is not a true representation of the plasma emission. With time, the initial plasma expands radially into a larger localized region in the ambient gas and then cools, lowering the background level and yielding to a more reliable atomic emission spectrum from the constituents of the irradiated sample and the ambient gas [21,22,23,24,25,26,27,28,29,30,31,32]. The plasma temperature was estimated using the following Boltzmann two-line method [32,33],…”

Section: Resultsmentioning

confidence: 99%

“…The physical characteristics of laser induced plasma, such as the emission spectra profile, electron number density, and plasma temperature, determine the LIBS analytical performance. Moreover, the experimental parameters, including the pressure of the ambient gas, energy of the laser pulse, and probing position of the collection optical fiber, strongly influence the analytical performance of LIBS [18,19,20,21]. Thus, a better understanding of the plasma characteristics is essential for assuring a better LIBS reliability and effectiveness.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of laser induced breakdown investigated by a compact, nongated optical multichannel analyzer system and its potential application

Idris

Lahna

Ramli

et al. 2020

Heliyon

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Laser induced breakdown is a highly temporally and spatially dynamic phenomenon, normally studied using a highly temporally resolved optical detector system. In this work, a compact, low cost optical multichannel analyzer (OMA) system without a built-in temporal gating device and thus operated under a free running mode was used to investigate the characteristics of laser induced plasma. A Nd-YAG laser beam was used as the excitation source from several samples, namely, copper, zinc, and aluminum plates. The characteristics of the plasma emission produced under various experimental parameters, including the pulse energy, surrounding gas pressure, and collection fiber position, were examined. It was found that the essential features of emission spectra can be investigated even using the ungated, compact OMA system even without a highly temporally resolved gating system. The plasma emission characteristics critically depend on the experimental parameters. A quality emission spectrum, featuring a high intensity with a low background, can be obtained using the ungated, compact OMA system under optimized conditions, namely, a pulse energy of approximately 8 mJ, a surrounding gas pressure of 10 Torr, and a collection fiber position of more than 5 mm above the surface of the sample. The features of the emission spectra detected under optimized conditions are only similar to those obtained using a sophisticated, gated OMA system. The characteristics of the emission spectra are in good agreement with the previous assumption of the shockwave role in plasma excitation. Having quality emission spectra under the optimized conditions, a preliminary practical laser induced breakdown spectroscopy (LIBS) analysis using the ungated, compact OMA system was performed on several samples, such as standard brass, commercial pure gold, and natural stone samples. The aluminum emission lines are strongly detected from the standard brass sample (C1118) containing aluminum at 2.8%. The LIBS system also unequivocally revealed a qualitatively abandoned impurity presence in the purportedly pure commercial gold sample. It also effectively confirmed qualitatively a Cu presence in the blinking spots of the natural stone collected from a traditional mining site in Aceh. This result implies the effectiveness of the LIBS using the ungated, compact OMA system for quick, practical analysis.

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“…By analyzing the spot offset of different focusing positions captured by a CCD, Ashrafkhani et al 19 realized a system with automatic focusing. Cortez et al 20 designed an optical system based on two laser pointers for autofocus. However, these structures not only increase the difficulty of installation, but also require pre-ablation, which is time-consuming.…”

Section: Introductionmentioning

confidence: 99%

Classification of uneven steel samples by laser induced breakdown spectroscopy based on a Bessel beam

Yan

Zhu

et al. 2023

J. Anal. At. Spectrom.

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A Simple Device for Lens-to-Sample Distance Adjustment in Laser-Induced Breakdown Spectroscopy (LIBS)

Cited by 15 publications

References 17 publications

Lens-to-sample distance effect on the quantitative analysis of steel by laser-induced breakdown spectroscopy

Lens-to-sample distance effect on the quantitative analysis of steel by laser-induced breakdown spectroscopy

Characteristics of laser induced breakdown investigated by a compact, nongated optical multichannel analyzer system and its potential application

Classification of uneven steel samples by laser induced breakdown spectroscopy based on a Bessel beam

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