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Title: Characterization of high-explosive detonations using broadband infrared external cavity quantum cascade laser absorption spectroscopy

Abstract

Infrared laser absorption spectroscopy provides a powerful tool for probing physical and chemical properties of high explosive detonations. A broadly-tunable swept-wavelength external cavity quantum cascade laser (ECQCL) operating in the mid-wave infrared (MWIR) spectral region is used to measure transmission through explosive fireballs generated from 14 g charges of 4 different explosive types detonated in an enclosed chamber. Analysis of time-resolved transmission and emission at a 2 µs sampling rate shows the evolution of fireball infrared opacity in the first 10 ms after detonation. Broadband high-resolution absorption spectra acquired over the spectral range 2050-2300 cm -1 (4.35-4.88 µm) at a 100 Hz rate are used to measure properties of fireball evolution over longer time scales out to 100 s. Path-integrated concentrations of combustion products CO, CO 2, H 2O, and N 2O are measured and show evolutions over multiple time scales and significant differences between explosive types. Spectral analysis is used to characterize gas temperature and to measure broadband attenuation from absorption and scattering of particulates. In conclusion, analysis of the results provides information on the MWIR optical properties, gaseous detonation/combustion products, and particulates throughout the explosive process including initial detonation, fireball expansion and cooling, and diffusive mixing in themore » chamber.« less

Authors:
 [1];  [2]; ORCiD logo [2];  [2];  [3];  [3]
  1. Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Univ. of Arizona, Tucson, AZ (United States); Opticslah, LLC, Albuquerque, NM (United States)
  2. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  3. Univ. of Illinois at Urbana-Champaign, Urbana, IL (United States)
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1572941
Alternate Identifier(s):
OSTI ID: 1560252
Report Number(s):
PNNL-SA-144770
Journal ID: ISSN 0021-8979
Grant/Contract Number:  
AC05-76RL01830
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 126; Journal Issue: 9; Journal ID: ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE; laser; explosives; infrared

Citation Formats

Phillips, Mark C., Bernacki, Bruce E., Harilal, Sivanandan S., Brumfield, Brian E., Schwallier, Joel M., and Glumac, Nick G. Characterization of high-explosive detonations using broadband infrared external cavity quantum cascade laser absorption spectroscopy. United States: N. p., 2019. Web. doi:10.1063/1.5107508.
Phillips, Mark C., Bernacki, Bruce E., Harilal, Sivanandan S., Brumfield, Brian E., Schwallier, Joel M., & Glumac, Nick G. Characterization of high-explosive detonations using broadband infrared external cavity quantum cascade laser absorption spectroscopy. United States. doi:10.1063/1.5107508.
Phillips, Mark C., Bernacki, Bruce E., Harilal, Sivanandan S., Brumfield, Brian E., Schwallier, Joel M., and Glumac, Nick G. Tue . "Characterization of high-explosive detonations using broadband infrared external cavity quantum cascade laser absorption spectroscopy". United States. doi:10.1063/1.5107508. https://www.osti.gov/servlets/purl/1572941.
@article{osti_1572941,
title = {Characterization of high-explosive detonations using broadband infrared external cavity quantum cascade laser absorption spectroscopy},
author = {Phillips, Mark C. and Bernacki, Bruce E. and Harilal, Sivanandan S. and Brumfield, Brian E. and Schwallier, Joel M. and Glumac, Nick G.},
abstractNote = {Infrared laser absorption spectroscopy provides a powerful tool for probing physical and chemical properties of high explosive detonations. A broadly-tunable swept-wavelength external cavity quantum cascade laser (ECQCL) operating in the mid-wave infrared (MWIR) spectral region is used to measure transmission through explosive fireballs generated from 14 g charges of 4 different explosive types detonated in an enclosed chamber. Analysis of time-resolved transmission and emission at a 2 µs sampling rate shows the evolution of fireball infrared opacity in the first 10 ms after detonation. Broadband high-resolution absorption spectra acquired over the spectral range 2050-2300 cm-1 (4.35-4.88 µm) at a 100 Hz rate are used to measure properties of fireball evolution over longer time scales out to 100 s. Path-integrated concentrations of combustion products CO, CO2, H2O, and N2O are measured and show evolutions over multiple time scales and significant differences between explosive types. Spectral analysis is used to characterize gas temperature and to measure broadband attenuation from absorption and scattering of particulates. In conclusion, analysis of the results provides information on the MWIR optical properties, gaseous detonation/combustion products, and particulates throughout the explosive process including initial detonation, fireball expansion and cooling, and diffusive mixing in the chamber.},
doi = {10.1063/1.5107508},
journal = {Journal of Applied Physics},
number = 9,
volume = 126,
place = {United States},
year = {2019},
month = {9}
}

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