Optical emissions from spherical charges

Nick G. Glumac, Allen L. Kuhl

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Optical emissions from 50 and 100-g spherical charges were investigated. When the detonation products (DP) expand, they act like a spherical piston-driving a spherical blast wave into the atmosphere. Emissions from this blast wave come from: shock-heated air molecules, detonation-products molecules, combustion products molecules, and carbon particles formed in the detonation wave. Six HEs were studied: TNT, Comp B, PBX-N5, Comp A5, Tritonal, and AP-NM. HE powder was pressed in hemispherical molds. For TNT and Tritonal, a central booster of PBXN-5 and a RP-80 were used to detonate the charges. Experiments were conducted in air versus N2 to control combustion, and at different pressures (1, 0.1 and 0.01 bars) to control emissions from the shock-heated air. Emission histories were measured with an Andor fast kinetics spectrometer. In the visible regime, emission spectra were well fit by a Planckian function-thereby allowing us to compute the evolution of the emission temperature of the fireball. Maximum temperatures in the 1st peak correlate with CJ temperature of the particular explosive. Estimated temperatures fall due to the adiabatic expansion of the fireball gases. The 2nd optical peak was caused by re-heating of the fireball and carbon particles by the shock reflections from the chamber floor.

Original languageEnglish (US)
Title of host publicationShock Compression of Condensed Matter - 2019
Subtitle of host publicationProceedings of the Conference of the American Physical Society Topical Group on Shock Compression of Condensed Matter
EditorsJ. Matthew D. Lane, Timothy C. Germann, Michael R. Armstrong, Ryan Wixom, David Damm, Joseph Zaug
PublisherAmerican Institute of Physics Inc.
ISBN (Electronic)9780735440005
StatePublished - Nov 2 2020
Event21st Biennial American Physical Society Conference on Shock Compression of Condensed Matter, SCCM 2019 - Portland, United States
Duration: Jun 16 2019Jun 21 2019

Publication series

NameAIP Conference Proceedings
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616


Conference21st Biennial American Physical Society Conference on Shock Compression of Condensed Matter, SCCM 2019
Country/TerritoryUnited States

ASJC Scopus subject areas

  • General Physics and Astronomy


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