Laser-induced breakdown spectroscopy in China

Wang, Zhe; Yuan, Tingbi; Hou, Zongyu; Zhou, Weidong; Lü, Jidong; Ding, Hongbin; Zeng, Xiaoyan

doi:10.1007/s11467-013-0410-0

Cited by 197 publications

(86 citation statements)

References 89 publications

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“…Laser-induced breakdown spectroscopy (LIBS) has been demonstrated its potential in elemental analysis of various samples [1,2]. LIBS offers significant advantages compared to other techniques, since LIBS has multi-element capability, low sample requirements and high speed of acquisition allowing real-time measurements [3].…”

Section: Introductionmentioning

confidence: 99%

A method for improving wavelet threshold denoising in laser-induced breakdown spectroscopy

Zhang

Sun

et al. 2015

Spectrochimica Acta Part B: Atomic Spectroscopy

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Section: Introductionmentioning

confidence: 99%

A method for improving wavelet threshold denoising in laser-induced breakdown spectroscopy

Zhang

Sun

et al. 2015

Spectrochimica Acta Part B: Atomic Spectroscopy

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“…However, it has several decisive disadvantages which have severely restricted its application: the machine itself and its operation cost are very expensive, and its neutron source presents potential health hazards and has strict regulatory demands [1]. As a relative inexpensive and non-harmful technique, laser-induced breakdown spectroscopy (LIBS) has been regarded as a potential leading analytical technology for applications with online or fast analysis demands, including coal analysis, because of its advantages of fast and multi-elemental analyses, with minimal or no sample preparation [2].…”

Section: Introductionmentioning

confidence: 99%

Effects of moisture content on coal analysis using laser-induced breakdown spectroscopy

Chen

Yuan

Hou

et al. 2015

Spectrochimica Acta Part B: Atomic Spectroscopy

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Laser-induced breakdown spectroscopy (LIBS) is regarded as a very promising technique for fast or online coal analysis. However, the analytical performance is greatly influenced by its moisture content. In the present work, the effects of moisture content variations on the properties of the laser-induced plasma and its spectral signals were investigated using the same coal samples mixed with different moisture contents. Plasma morphology and spatially resolved spectra were also obtained to further investigate the effects, and the mechanism of the effects was also discussed. Results showed that most of the spectral line intensities decreased as the moisture content increased, even including those of H and O. Seen from the spatially resolved spectra, the profile of H intensity over the height of plasma showed a higher peak position with increasing moisture content, and the height of the peak of the H intensity profile was slightly higher than those of other elements such as C and Al. The laser ablation process and mechanism underlying the effects of moisture content were proposed as following: part of the moisture was evaporated first under laser radiation and ablated earlier than those of other coal materials. Consequently, the outside layer of the laser-induced plasma was mostly from the dissociation of moisture. Given the earlier evaporation of moisture, part of the energy was used to dissociate and ionize the surrounding water vapor or even reflected by the splashed particle caused by fast expanding moisture, thereby shielding the further absorption of laser energy to the solid coal material. This phenomenon resulted in less coal mass being actually ablated into the plasma with increasing moisture content, hence emitting smaller line intensities. On the other hand, the decrease in H line intensity may be caused by the fact that these elements were pushed to the outside cooler layer.

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“…Some of LIBS unique advantages include the ability to make in situ analysis even in hostile environment, remote sensing, little or no preparation of the sample, and multi-element analysis [10][11][12]. Based on these advantages, LIBS has been extensively investigated on several samples including liquids [13], gases [14] and as well from non-conducting and conducting solids [15].…”

mentioning

confidence: 99%

Influence of laser energy on the electron temperature of a laser-induced Mg plasma

Asamoah

Yao

2016

Appl. Phys. B

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radiations in this process are used for the identification of the elemental composition of the sample [7][8][9].LIBS offers many advantages over other spectroscopic techniques such as mass spectroscopy, electrode spark and inductively coupled plasma. Some of LIBS unique advantages include the ability to make in situ analysis even in hostile environment, remote sensing, little or no preparation of the sample, and multi-element analysis [10][11][12]. Based on these advantages, LIBS has been extensively investigated on several samples including liquids [13], gases [14] and as well from non-conducting and conducting solids [15].LIBS is also a spectroscopic technique for the determination of the density of electron, electron temperature and number densities of the plasma plume [16,17]. Laserinduced plasma temperatures are influenced by various experimental conditions such as ambient surrounding, laser energy and laser pulse width. Most of the studies on LIBS temperatures report that the plasma temperature tends to increase with increasing laser energy, pulse width, laser wavelength and ambient pressure [18][19][20][21].Although LIBS has been employed successfully in several experimental and theoretical works, to analyze the spectroscopic composition of the samples, there are still many aspects which need to be investigated [6]. For example, Barthelemy et al. [22] investigated the influence of the laser parameters of an aluminum-induced plasma. They reported that the temperature slightly decreases at the plasma edge and close to the aluminum surface. This decrease in temperature at the plasma edge is basically caused by radiative cooling, while the decrease in temperature at the aluminum surface is as a result of thermal conduction. The authors also found that at the first microsecond of the ablation plume, the electron density was spatially homogeneous.Zhang et al.[23] also reported on the influence of laser parameters on plasma temperature. Their results predicted Abstract The magnesium plasma induced by a 1064-nm Q-switched Nd:YAG laser in atmospheric air was investigated. The evolution of the plasma was studied by acquiring spectral images at different laser energies and delay times. We observed that the intensities of the spectral lines decrease with larger delay times. The electron temperature was determined using the Boltzmann plot method. At a delay time of 100 ns and laser energy of 350 mJ, the electron temperature attained their highest value at 10164 K and then decreases slowly up to 8833.6 K at 500 ns. We found that the electron temperature of the magnesium plasma increases rapidly with increasing laser energy.

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Laser-induced breakdown spectroscopy in China

Cited by 197 publications

References 89 publications

A method for improving wavelet threshold denoising in laser-induced breakdown spectroscopy

A method for improving wavelet threshold denoising in laser-induced breakdown spectroscopy

Effects of moisture content on coal analysis using laser-induced breakdown spectroscopy

Influence of laser energy on the electron temperature of a laser-induced Mg plasma

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