Precise alignment of the collection fiber assisted by real-time plasma imaging in laser-induced breakdown spectroscopy

Motto-Ros, Vincent; Nègre, E; Pelascini, Frédéric; Panczer, G.; Yu, Jianhua

doi:10.1016/j.sab.2013.12.008

Cited by 76 publications

(54 citation statements)

References 24 publications

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“…The instrument used to provide the LIBS images has been described in [12] and [13] (laser source was a Nd:YAG emitting 8 ns pulses at 1064 nm with a 100 Hz repetition rate; laser energy was reduced at typically 1.5 mJ; laser pulses were focused onto the sample by a 15× magnification objective resulting in a crater size close to 8 µm). The spatial distributions of Mg and Sr were found to be rather similar in the external layer (Figure 8a and 8c).…”

Section: Photonic Methods and Resultsmentioning

confidence: 99%

Photons and electrons for the study of a white veil covering some walls in prehistoric caves

et al. 2017

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Our research deals with the evolution of wall surfaces in prehistoric caves. The focus of this paper is dedicated to the structural and chemical characterization of a white concretion partially covering some walls in caves. In one of the caves, a non-ornate one which became a laboratory-cave (the Leye cave at Marquay, Dordogne, France) located in the Vézère valley, a set of physical methods has been proposed and tested on the first samples taken: SEM-EDXS, cathodoluminescence and laser-based techniques such as Raman spectroscopy and Laser Induced Breakdown Spectroscopy and LIBS. Thus two facies mainly composed of calcium carbonate crystals have been determined: moonmilk and coralloids. The identification of theses crystalline phases is the first step of an ambitious research project that plans to understand the development of unexpected layers on the cave walls of the famous ornate caves listed as part of the UNESCO cultural heritage sites. This first set of data provides good insight to the structure and the physico-chemical composition of the involved materials. Future works will be dedicated to bring knowledge about the facies chronology, the climatic conditions of environment (temperature, CO<sub>2 </sub>rate and air velocities) over a long period.

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Section: Photonic Methods and Resultsmentioning

confidence: 99%

Photons and electrons for the study of a white veil covering some walls in prehistoric caves

et al. 2017

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“…It has already been described in details elsewhere [37] and only its main components are described in the following. The laser source was a Nd:YAG emitting 5 ns pulses at the fundamental wavelength (1064 nm) with a 10 Hz repetition rate.…”

Section: Libs Imagingmentioning

confidence: 99%

“…In addition, the vertical positioning of the sample was controlled by using a laser pointer focused obliquely on the sample surface. The position of the laser pointer on the sample surface, imaged by the CCD camera, is indeed a direct monitoring of the focusing distance [37]. Homemade software developed in the LabVIEW environment controlled the all system and allowed automated sequences to be set in order to scan the region of interest.…”

Section: Libs Imagingmentioning

confidence: 99%

Quantitative elemental imaging of heterogeneous catalysts using laser-induced breakdown spectroscopy

Trichard

Sorbier

Moncayo

et al. 2017

Spectrochimica Acta Part B: Atomic Spectroscopy

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Nowadays, the use of catalysis is implied in almost all industrial process. Their use allows improving productivity, synthesis yields and waste treatment as well as decreasing the energy costs. The increasingly stringent requirements in terms of reaction selectivity and environmental standards impose an ever more accurate knowledge and control of their operations. However, the characterization techniques struggle to develop and often require equipment with high complexity.In this paper, we demonstrate a novel elemental approach with an all-optical design allowing quantitative space-resolved analysis to be performed with ppm-scale limit of quantification and µm-scale resolution. This approach, based on laser-induced breakdown spectroscopy (LIBS), is distinguished by its simplicity of use, all-optical design, and speed of operation. This work was conducted on palladium-based porous alumina catalyst, used for the selective hydrogenation process in the field of petrochemistry. We report an exhaustive study on the quantification capability of this technique with the possibility to perform imaging measurement over a large dynamical range, typically from few ppm to %. These results offer new insight into the use of LIBS imaging in the industry and paves the way for innumerable applications.2

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“…and Motto-Ros et al, 28 the relationship between the spatial distribution of the plasma and the spectral intensities of several characteristic lines was established. The spatial distributions of aluminium atoms, aluminium ions, argon atoms and argon ions were described.…”

mentioning

confidence: 92%

“…It was proved that the precise alignment of the collection ber, assisted by real-time plasma imaging, is an effective method to control the shape of the plasma and to keep the collecting parameters consistent in the laboratory environment. 28 However, it is hard to change either the position of the samples or the position of the collecting system in on-line applications in the factory environment, because the production line is always xed and the probe designed for industrial application is too large to be accurately controlled in real time. 4 Ni et al 29 presented a spectral normalization method assisted by the synchronous image of the plasma.…”

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confidence: 99%

An intensity correction method combined with plasma position information for laser-induced breakdown spectroscopy

Zhang

Sun

et al. 2017

J. Anal. At. Spectrom.

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The uncertainty of collected spectral data is one of the most important issues for the application of laserinduced breakdown spectroscopy (LIBS) quantitative analysis. The fluctuation of the target surface simultaneously affects both the focus depth of the laser beam and the relative collection position, either of which may lead to severe fluctuation of the spectral signal. Thus, in this study, for detecting and reducing the fluctuation, an imaging system was deployed to monitor the plasma, and a mathematical model was also built based on both spectral signal and positional information. An ICCD camera was used to record the image of the plasma so as to detect the plasma and acquire positional information. Furthermore, the relationship between plasma position and specific spectral line intensity was obtained by the fitting function. Five aluminium alloy samples were employed to validate the reliability of the proposed method.

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Precise alignment of the collection fiber assisted by real-time plasma imaging in laser-induced breakdown spectroscopy

Cited by 76 publications

References 24 publications

Photons and electrons for the study of a white veil covering some walls in prehistoric caves

Photons and electrons for the study of a white veil covering some walls in prehistoric caves

Quantitative elemental imaging of heterogeneous catalysts using laser-induced breakdown spectroscopy

An intensity correction method combined with plasma position information for laser-induced breakdown spectroscopy

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