Laser-induced fluorescence in high pressure solid propellant flames

Edwards, Tim; Weaver, D. P.; Campbell, David H.

doi:10.1364/ao.26.003496

Cited by 28 publications

(4 citation statements)

References 15 publications

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“…, 1997, and various spectroscopic probes at different wavelengths (Avouris et al . 1981;Edwards et al . 1987;Eloy & Delpuech 1988;Leeuw et al .…”

Section: Introductionmentioning

confidence: 99%

On the laser ignition and initiation of explosives

Bourne¹

2001

Proc. R. Soc. Lond. A

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Energetic materials are conventionally ignited by the application of heat to some part of an explosive target. This is most often provided by a flame or by electrical heating using a resistive wire. The material responds by thermally heating and starting a burning zone, which spreads out from the ignition point generating gas. In some cases this zone can accelerate (due to the effect of this gas) into a reactive shock wave, termed detonation. Lasers are used in a variety of applications to thermal heat a range of materials, and thus seem an obvious candidate to trigger chemical reaction in energetic ones. A light pulse offers several advantages over an electrical one, since it may be delivered down a path both immune to electrical effects and chemically stable. Thus, the triggering of safety apparatus (such as the firing of bolts on aircraft exits) represents a major thrust in the development of laser-triggered explosive devices. The energy of the pulse may be used in one of two ways to achieve these effects. In the first, the laser is shone directly upon the chemical medium, which absorbs the light at discrete wavelengths. In the second, it is used to vaporize a metallic flyer that is launched to impact on a target creating a high-pressure zone. Either mechanism starts the required reaction. However, when the pulse is delivered directly to the material, detonation is found to proceed immediately with no transition via burning. This makes the process inexplicable using present concepts. This review will address a range of the experiments conducted and theories developed for this novel field. However, it should be emphasized that the fundamental mechanisms remain to be fully explained making the application both academically stimulating as well as industrially important.

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“…, 1997, and various spectroscopic probes at different wavelengths (Avouris et al . 1981;Edwards et al . 1987;Eloy & Delpuech 1988;Leeuw et al .…”

Section: Introductionmentioning

confidence: 99%

On the laser ignition and initiation of explosives

Bourne¹

2001

Proc. R. Soc. Lond. A

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“…Although such high-pressure, high-luminosity, heavily particles laden environment of solid propellant combustion makes optical measurements di©cult, these are required in order to better understand combustion phenomena and to provide data for the validation of modeling and numerical simulations. The LIF technique has been pioneeringly applied by Edwards et al [14] to investigate the §ames of a monopropellant (HMX) and an AP/HTPB propellant at elevated pressures (up to 3.5 MPa). The authors pointed out:…”

Section: Laser Induced Fluorescence Imaging Measurements On Iron Atommentioning

confidence: 99%

Recent progress of laser metrology in chemically reacting flows at onera

Mohamed

Dorval

Vilmart

et al. 2017

Progress in Flight Physics

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This paper presents some of the development actions performed these last years at ONERA using laser spectroscopic techniques to probe chemically reacting §ows. Techniques like laser absorption, laser induced §u-orescence (LIF), and Raman scattering will be described with focus on present drawbacks as well as expectations from new laser technologies (Interband Cascade Lasers (ICL) diodes, Optical Parametrical Oscillators (OPO), frequency comb, and femto/picosecond lasers) before showing some results of recent applications in ground facilities.

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“…An additional application of particular interest to the work presented in this dissertation is seeding alkali metal as an electron donor for microwave-assisted combustion and flame speed enhancement due to low ionization threshold. 11 . It is necessary to understand the decomposition processes and kinetic mechanisms of the solid propellants to establish models 12 .…”

Section: Motivationmentioning

confidence: 99%

“…Solid propellant combustion exhibits both high temperature and multiphase phenomena, which makes it a challenging environment for study 11 . Due to this fact, laser-based combustion diagnostics have potential as non-intrusive, in-situ, and high resolution (temporal and spatial) measurement techniques to study propellant combustion 14 .…”

Section: Literature Reviewmentioning

confidence: 99%

Two-photon laser-induced fluorescence in sodium-doped composite propellant flame

Zhu

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Laser-induced fluorescence in high pressure solid propellant flames

Cited by 28 publications

References 15 publications

On the laser ignition and initiation of explosives

On the laser ignition and initiation of explosives

Recent progress of laser metrology in chemically reacting flows at onera

Two-photon laser-induced fluorescence in sodium-doped composite propellant flame

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