Detection of explosives by ultrasonic spectrum upon pulsed laser initiation

Aleksej M. Rodin; Jonas Sarlauskas; Jelena Tamuliene; Augustinas Petrulėnas

doi:10.1117/12.2573678

20 September 2020 Detection of explosives by ultrasonic spectrum upon pulsed laser initiation

Aleksej M. Rodin, Jonas Sarlauskas, Jelena Tamuliene, Augustinas Petrulėnas

Proceedings Volume 11542, Counterterrorism, Crime Fighting, Forensics, and Surveillance Technologies IV; 115420E (2020) https://doi.org/10.1117/12.2573678
Event: SPIE Security + Defence, 2020, Online Only

Abstract

The ability to identify explosives by ultrasonic spectra up to 45 kHz has been investigated for forensic and anti-terror applications. To lower the threshold for laser initiation, nontrivial and well-known azides, CTAP, HMDT, ETN, HMX and other energetic materials have been synthesized. Upon initiation of copper azide by Nd:YAG laser with 11 ns pulsewidth, a threshold of only ~80 μJ was reached, and for 50 μs pulses of laser diode it was ~300 μJ, which is consistent with the thermal initiation nature. Significant differences were found in the spectrum of high-frequency acoustic and ultrasonic vibrations for various energetic materials and bilayer structures. The effective frequency range for the dissociation of copper azide, silver azide and HMTD is limited by ~27 kHz. The spectra of bilayer structures demonstrate suppression of the characteristic lines of copper azide and enrich the spectrum in the ~27 – 45 kHz range: ETN appears in relatively wide bands, while HMX modulates the spectrum with periodic ~3 kHz bands. If successful, the discovered patterns can be used in disaster forensics.

Conference Presentation

Citation Download Citation

Aleksej M. Rodin, Jonas Sarlauskas, Jelena Tamuliene, and Augustinas Petrulėnas "Detection of explosives by ultrasonic spectrum upon pulsed laser initiation", Proc. SPIE 11542, Counterterrorism, Crime Fighting, Forensics, and Surveillance Technologies IV, 115420E (20 September 2020); https://doi.org/10.1117/12.2573678

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