Experimental study on wideband electromagnetic radiation from plasma cloud

Qing, 戴晴 Dai; Jianguo, 何建国 He; Shangwu, 王尚武 Wang; Chuanlu, 李传胪 Li

doi:10.3788/hplpb20102206.1399

Cited by 4 publications

(1 citation statement)

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“…Therefore, when studying the electromagnetic radiation of energetic materials, as long as the parameters of m, Mc, f, B, and D are considered, u(f ), v(f ), and u are considered equivalently. In electromagnetism, E = q 4πεr 2 when measuring the electromagnetic radiation of energetic materials, the electric field intensity E, the dielectric constant of air ε, and the distance between antenna and explosion center r must be considered [12][13][14][15][16].…”

Section: Experimental Principlementioning

confidence: 99%

Research on Electromagnetic Radiation Characteristics of Energetic Materials

et al. 2022

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During the explosion of energetic materials, electromagnetic interference is generated, which can affect the normal operation of surrounding electronic equipment. Therefore, an electromagnetic radiation measurement device based on a short-wave omnidirectional antenna and ultra-wideband omnidirectional antenna was designed to measure the electromagnetic radiation generated by the explosion of energetic materials of different masses, and the electromagnetic radiation characteristics were obtained through data processing. The results showed that the electromagnetic signal can still be collected hundreds of milliseconds after the explosive is detonated, and the electromagnetic radiation generated by the explosion is continuous and intermittent, which is a phenomenon that has not been found in this field at present. The mass of the energetic material had a significant effect on the time-domain characteristics of the electromagnetic radiation generated by the explosion: the higher the mass of the energetic material was, the shorter the delay response of the electromagnetic signal was, the longer the duration was, and the earlier the peak appeared. The frequency of electromagnetic radiation signals generated by the explosion of energetic materials was mainly concentrated below 100 MHz, and the energy was most concentrated in the frequency band of 0~50 MHz. The composition of energetic materials had the greatest influence on the spectral distribution, and the spectral distribution of electromagnetic radiation produced by the explosion of explosives with different compositions had obvious specificity. The electromagnetic radiation intensity generated by the explosion of energetic materials had a strong correlation with the distance from the explosion center, and it significantly decreased as the distance increased. The structure and detonation method of energetic materials changed the geometrical motion pattern during the explosion, resulting in the non-uniformity of electromagnetic radiation propagation.

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Section: Experimental Principlementioning

confidence: 99%

Research on Electromagnetic Radiation Characteristics of Energetic Materials

et al. 2022

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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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