On the Initiation of High Explosives by Laser Radiation

Rubenchik, Alexander M.

doi:10.1002/prep.200700031

Cited by 19 publications

(14 citation statements)

References 6 publications

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“…These results suggest that chemical reactions with atmosphere initiated by the addition of the long IR pulse of DP-LIBS can create enhanced molecular emission [43,44], but enhancement may depend on the initial mechanisms of breakdown [39]. For the two cases here, a given IR power density likely facilitated the evaporation and explosive decomposition or burning of TNT, which has been personally observed by the current authors and others studying this effect [45][46][47], but polystyrene simply fragmented due to better chemical stability, as evidenced by the melting and boiling points of these two materials. Trinitrotoluene has an 80 °C melting point and a 240°C explosive boiling point; polystyrene has a melting point greater than 100°C m.p.…”

Section: Introductionsupporting

confidence: 53%

Mid-IR enhanced laser ablation molecular isotopic spectrometry

Brown

Ford

Akpovo

et al. 2016

Spectrochimica Acta Part B: Atomic Spectroscopy

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A double-pulsed laser-induced breakdown spectroscopy (DP-LIBS) technique utilizing wavelengths in the mid-infrared (MIR) for the second pulse, referred to as double-pulse LAMIS (DP-LAMIS), was examined for its effect on detection limits compared to single-pulse laser ablation molecular isotopic spectrometry (LAMIS). A MIR carbon dioxide (CO2) laser pulse at 10.6 μm was employed to enhance spectral emissions from nanosecond-laser-induced plasma via mid-IR reheating and in turn, improve the determination of the relative abundance of isotopes in a sample. This technique was demonstrated on a collection of 10 BO and 11 BO molecular spectra created from enriched boric acid (H3BO3) isotopologues in varying concentrations. Effects on the overall ability of both LAMIS and DP-LAMIS to detect the relative abundance of boron isotopes in a starting sample were considered. Least-squares fitting to theoretical models was used to deduce plasma parameters and understand reproducibility of results. Furthermore, some optimization for conditions of the enhanced emission was achieved, along with a comparison of the overall emission intensity, plasma density, and plasma temperature generated by the two techniques.

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Section: Introductionsupporting

confidence: 53%

Mid-IR enhanced laser ablation molecular isotopic spectrometry

Brown

Ford

Akpovo

et al. 2016

Spectrochimica Acta Part B: Atomic Spectroscopy

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“…ffi ffi ffi ffi ffi ffi at r p r expðÀ y 2 0 À z r erfc ðy 0 Þ " # ; (14) DT s ¼ T s À T 0 ¼ 2q 0 l ffi ffi ffi ffi ffi ffi at r p r : (15) Taking this solution into account, equation (12) can be rewritten in the following form…”

Section: Effect Of Decomposition Of Cuo Film On Ignition Of Organic Ementioning

confidence: 99%

“…As a result, to initiate organic EM with an open surface by a light pulse in a given spectral range, a high-power laser is needed [10]. In practice, to reduce the ignition threshold, the sample is usually covered with a transparent glass plate, and light absorbing particles ("hot spots") are introduced into the samples or laser absorbing films are applied to the EM surface [11][12][13][14][15][16][17]. Recently, works have appeared on the ignition of EM by metal particles heated to high temperatures, simulating the ignition of EM by ultrashort laser pulses, see, for example, [18].…”

Section: Introductionmentioning

confidence: 99%

Effect of Decomposition of CuO Film on Ignition of Organic Explosives by a Laser Pulse

Khaneft

Mitrofanov

Зверев

2019

Propellants Explo Pyrotec

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This work presents experimental results of the PETN ignition in a three-layer system: glass -copper oxide ( CuO) -explosive materials (EM) and results of numerical simulations of the ignition of PETN, RDX, HMX, and TATB with a CuO film heated by a YLS-150 fiber laser with a pulse duration of 20 ms. In the numerical simulations, the endothermic reaction of decomposition of the CuO film and decomposition reaction of EM were taken into account. It has been established that the endothermic effect of the CuO decomposition reaction increases the dynamic ignition delay time of EM. The expression for an estimation of width of a reaction layer in EM at heating by a constant heat stream is obtained. Calculations have shown that the dynamic threshold of ignition of organic explosives by laser pulse in a three-layer system (glass -CuO -EM) has a minimum for the thickness of the copper oxide film of 5 mm. The density of the critical ignition energy of an explosive laser pulse increases in the sequence of PETN, RDX, HMX, and TATB. The calculated dependence of the PETN dynamic ignition delay time on the thickness of the CuO film is consistent with the experimental data.

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“…There have been many reports [2][3][4][5] providing analytical solutions to Equation 10.16, under various conditions and simplifying assumptions. (corresponding to the ignition energy, ign = (I ign × l ) -that is, the threshold value of laser energy required for achieving sustained combustion (or detonation in the case of explosives under confined condition), relating to some experimentally measureable laser and sample parameters.…”

Section: Heat Transfer Theorymentioning

confidence: 99%