Electromagnetic Field Effects in Explosives

Tasker, D.G.; Whitley, V. H.; Lee, R. J.

doi:10.1063/1.3295137

Cited by 7 publications

(6 citation statements)

References 9 publications

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“…This conclusion can be applied to the identification and identification of explosive composition. The closer the distance to the explosion center, the larger the frequency distribution range of the electromagnetic signal, and the electromagnetic frequency distribution in different directions is obviously different [23][24][25].…”

Section: Analysis Of the Frequency-domain Characteristics Of Electrom...mentioning

confidence: 99%

Research on Electromagnetic Radiation Characteristics of Energetic Materials

Cui¹,

Kong²,

Jiang³

et al. 2022

Preprint

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During the explosion of energetic materials, obvious electromagnetic interference will be generated, which will affect the normal operation of surrounding electronic equipment. Experiments are still an important means to study this issue. A set of electromagnetic radiation measurement device based on short-wave omnidirectional antenna and ultra-wideband omnidirectional antenna is designed to measure the electromagnetic radiation generated by the explosion of energetic materials of different masses, and the electromagnetic radiation characteristics are obtained through data processing. The results show that the mass of the energetic material has a significant effect on the time-domain characteristics of the electromagnetic radiation generated by the explosion: the higher the mass of the energetic material, the shorter the delay response of the electromagnetic signal, the longer the duration, and the earlier the peak appears. The frequency of electromagnetic radiation signals generated by the explosion of energetic materials is mainly concentrated below 100 MHz, and the energy is most concentrated in the frequency band of 0~50 MHz. The composition of energetic materials has the greatest influence on the spectral distribution, and the spectral distribution of electromagnetic radiation produced by the explosion of explosives with different compositions has obvious specificity. The electromagnetic radiation intensity generated by the explosion of energetic materials has a strong correlation with the distance from the explosion center, and it decreases with the increase of the distance, and the decreasing range is large. The structure and detonation method of energetic materials can change the geometrical motion mode during the explosion, resulting in the non-uniformity of electromagnetic radiation propagation.

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Section: Analysis Of the Frequency-domain Characteristics Of Electrom...mentioning

confidence: 99%

Research on Electromagnetic Radiation Characteristics of Energetic Materials

Cui¹,

Kong²,

Jiang³

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…Numerous studies in this area have been conducted in the Los Alamos National Laboratory [19][20][21][22][23]. Nemzek [20] analyzed the relationship between the time at which the maximum low-frequency signal was measured and the shock wave propagation and speculated that the low-frequency signal was related to the plasma generated by detonation.…”

Section: Introductionmentioning

confidence: 99%

Study on Electromagnetic Radiation Generated During Detonation

Ren

Chu

2019

Propellants Explo Pyrotec

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Electromagnetic radiation generated by an explosion significantly interferes with devices used in explosion tests. To study this electromagnetic radiation generated during the explosion of explosives, experiments using different masses of composition B explosives were performed, where coils were used to measure electromagnetic pulses generated by the explosion. The acquired signals were de-noised by a wavelet analysis to extract the real signals. Three typical pulses were identified at different times after detonation, which were locally amplified and investigated in detail to differentiate their origins. Based on this analysis, a numerical simulation of the entire explosion process was performed. The EXPLOSION-3D hydrocode was used to simulate the experimental cases, and the prop-agation of the air shock wave over time was modelled. Comparing the experimental and calculated results, we made the following observations. First, an electromagnetic pulse was directly generated by the high-temperature plasma produced by detonation of the composition B explosive; second, an electromagnetic pulse was generated by charged particles, which were in turn generated by the unbalanced and incompletely ionized plasma formed by the shock wave reflected from the ground meeting the front shock wave; and third, an pulse was caused by the shock wave impacting the measuring coils and was considered an experimental artefact and not a result of the explosion.

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“…It has been shown that gaseous ejecta or plasma from detonating high explosives travel at 10 km/s in cylindrical shock tubes [1,[6][7][8] and can be focused in conical shock tubes to achieve impact velocities as high as 25 km/s (this work, framing camera studies). Heat fluxes projected onto target surfaces are estimated to be 1 to 10 GW/m 2 [9] and the damage to targets may be correlated with these thermal effects [10].…”

Section: Introductionmentioning

confidence: 99%

The interaction of explosively generated plasma with explosives

Tasker¹,

Whitley²,

Johnson³

2017

AIP Conference Proceedings

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Abstract.It has been shown that the temperature of explosively generated plasma (EGP) is of the order of 1 eV and plasma ejecta can be focused to achieve velocities as high as 25 km/s. Proof-of-principle tests were performed to determine if EGP could be used for explosive ordnance demolition and other applications. The goals were: to benignly disable ordnance containing relatively sensitive high performance explosives (PBX-9501); and to investigate the possibility of interrupting an ongoing detonation in a powerful high explosive (again PBX-9501) with EGP. Experiments were performed to establish the optimum sizes of plasma generators for the benign deactivation of high explosives, i.e., the destruction of the ordnance without initiating a detonation or comparable violent event. These experiments were followed by attempts to interrupt an ongoing detonation by the benign disruption of the unreacted explosive in its path. The results were encouraging. First, it was demonstrated that high explosives could be destroyed without the initiation of a detonation or high order reaction. Second, ongoing detonations were successfully interrupted with EGP. [LA-UR-15-25350]

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Electromagnetic Field Effects in Explosives

Cited by 7 publications

References 9 publications

Research on Electromagnetic Radiation Characteristics of Energetic Materials

Research on Electromagnetic Radiation Characteristics of Energetic Materials

Study on Electromagnetic Radiation Generated During Detonation

The interaction of explosively generated plasma with explosives

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