Characterization of high-explosive detonations using broadband infrared external cavity quantum cascade laser absorption spectroscopy
AuthorPhillips, Mark C.
Bernacki, Bruce E.
Harilal, Sivanandan S.
Brumfield, Brian E.
Schwallier, Joel M.
Glumac, Nick G.
AffiliationUniv Arizona, Coll Opt Sci
MetadataShow full item record
PublisherAMER INST PHYSICS
CitationJ. Appl. Phys. 126, 093102 (2019); https://doi.org/10.1063/1.5107508
JournalJOURNAL OF APPLIED PHYSICS
RightsCopyright © 2019 Author(s).
Collection InformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at firstname.lastname@example.org.
AbstractInfrared 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 operating in the mid-wave infrared (MWIR) spectral region is used to measure transmission through explosive fireballs generated from 14g charges of 4 different explosive types detonated in an enclosed chamber. Analysis of time-resolved transmission and emission at a 2 mu s sampling rate shows the evolution of fireball infrared opacity in the first 10ms after detonation. Broadband high-resolution absorption spectra acquired over the spectral range of 2050-2300cm(-1) (4.35-4.88 mu m) at a 100Hz rate are used to measure properties of fireball evolution over longer time scales out to 100s. 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. 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.
Note12 month embargo; published online: 3 September 2019
VersionFinal published version
SponsorsNational Nuclear Security Administration, Defense Nuclear Nonproliferation RD Office; U.S. Department of Energy (DOE)United States Department of Energy (DOE) [DE-AC05-76RL01830]