Temperature measurements in a decaying laser-induced plasma in air at elevated pressures

Böker, D.; Brüggemann, Dieter

doi:10.1016/j.sab.2010.11.014

Cited by 26 publications

(7 citation statements)

References 31 publications

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“…High-pressure LIP spectra is characterized by the degradation of the emission signal due to the increase of density and number of quenching collisions in the plasma and the faster transfer of energy from the plasma to the surrounding environment upon increasing gas pressure. For this reason the spectra are dominated by continuum radiation and the emission lines appear broadened as a consequence of the pressure broadening mechanisms and to the increase of the extent of self-absorption [106]. The most interesting cases, in the frame of extreme environment LIP diagnostics, is the LIP produced in liquids [107], because of several applications, including NPs formation, ocean exploration and various medical applications.…”

Section: Perspectivesmentioning

confidence: 99%

Laser-induced plasma emission: from atomic to molecular spectra

Giacomo¹,

Hermann²

2017

J. Phys. D: Appl. Phys.

126

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The aim of this paper is the description of the optical emission spectral features of the plasma produced by laser matter interaction from a fundamental point of view. The laser induced plasma emission spectra are discussed in connection with the basic mechanisms that take place in the plasma phase at different time delays from the laser pulse. Being the laser induced plasma a dynamics system, the hierarchy of the elementary mechanisms changes continuously because the electron number density and the electron temperature decrease during the expansion. As a consequence of this, along the plasma's persistence time, the prevailing emitting species changes from ions to atoms and from atoms to molecules. Both atomic and molecular emission spectroscopy are discussed to convey a complete description of temporal evolution of the laser induced plasma. Current literature, as well as the traditional plasma's theories, are presented and discussed in order to give to the reader a general idea of the potentialities and of the drawbacks of emission spectroscopy for the study of laser induced plasma and the of the various applications.

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Section: Perspectivesmentioning

confidence: 99%

Laser-induced plasma emission: from atomic to molecular spectra

Giacomo¹,

Hermann²

2017

J. Phys. D: Appl. Phys.

126

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“…Various researchers world wide have studied and reported effect of laser irradiation on Cu, Li, Zn, Al, Fe, Pb, Sn, Si and their alloy under ambient pressure, vacuum and using gases like argon and neon. They also studied the END and ET behavior at different laser harmonic, energy level and distances of target material from the laser irradiance by using ranges of spectroscopic methods [17][18][19][20][21][22][23][24][25][26][27][28][29][30]. From last few decades, due to diverse applications as well as ease of utilization, relative simplicity, low cost and highshot-rate capability of laser driven material has became a very important field and the description of material in the form of ET and END has added a substantial curiosity in recent years for the understanding and utilization of these complex matter in daily life.…”

Section: Introductionmentioning

confidence: 99%

Measurement of electron number density and temperature of laser-induced Silver plasma

Musadiq¹,

Iqbal

Amin³

et al. 2012

IJET

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Silver (Ag) plasma generated by second harmonics (532 nm) using Nd:YAG laser has been investigated at 17.6 mJ and 88.6 mJ energy level. The spatial behavior of the END and Electron Temperature (ET) was measured at ambient air pressures at different energy level and distance ranging from 0-4.5 mm form the target metal. The ET's were found to be varies from 17895 K to 10593 K, while END was found to be 2.229  10 15 to 6.44  10 14 cm -3 and 1.76  10 16 to 1.893  10 15 cm -3 for 17.6 mJ and 88.6 mJ energy, respectively. The relationship of END and ET found directly related to laser irradiance, while they were inverse to the distance from the target material surface to laser beam source.

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“…However taking into account any effect of laser radiation on any object would raise very demanding and labor-intensive tasks. For instance, the deposition of energy by the laser and its measurement as well as its effect may be complex as it is shown for laser induced ignition by short pulse lasers in [25] and [26], respectively.…”

Section: Exposure Limits (Els Mpes)mentioning

confidence: 99%

Quantitative laser safety analysis for application of high-energy lasers in a field test

2014

Self Cite

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There is a variety of national and international standards for laser safety analysis requesting for risk reduction of hazards due to laser radiation. A lot of risks are already addressed by the standards. Thus appropriate evaluation methods for calculating dangerous radiation levels and measures for risk reduction are available for certain types of risks. However, when high energy lasers are applied in outdoor environments a variety of additional risks may arise. Due to high laser energy and varying outdoor environmental conditions, appearance and options of risks increase. Assuming that radiation can be held below certain Maximum Permissible Exposure (MPE) levels anywhere in the unmonitored surrounding is impracticable when high energy lasers (HEL) are applied in outdoor environments. Therefore, an adjusted approach of methodology and appropriate materials, i.e. data and algorithms for risk assessment, is necessary.In the study reported here, we conduct a probabilistic risk assessment (PRA) focused on an application of HEL radiation in outdoor field tests. Thus we identify hazards within a particular field test environment and estimate the risks associated to these hazards using a probabilistic approach. The risks are assessed for being acceptable by probability of occurrence and severity. General risk management processes then demand that risks that exceed an acceptable level need to be reduced through appropriate risk reduction measure that either reduce the probability of occurrence or the consequences of an accident associated to that hazard. After having verified that all our recommended measures are implemented to a sufficient extend, field tests may be conducted.

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Temperature measurements in a decaying laser-induced plasma in air at elevated pressures

Cited by 26 publications

References 31 publications

Laser-induced plasma emission: from atomic to molecular spectra

Laser-induced plasma emission: from atomic to molecular spectra

Measurement of electron number density and temperature of laser-induced Silver plasma

Quantitative laser safety analysis for application of high-energy lasers in a field test

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