TY - JOUR
T1 - Hyperspectral Imaging for Temperature Measurements of Hot Spots in Shocked Plastic-Bonded Explosives
AU - Sellan, Dhanalakshmi
AU - Valluri, Siva Kumar
AU - Dlott, Dana D.
N1 - Publisher Copyright:
© 2024 American Institute of Physics Inc.. All rights reserved.
PY - 2024/12/9
Y1 - 2024/12/9
N2 - Hot spots are formed when energetic microstructures are shocked, and they play a critical role in shock sensitivity. It is important to know both the time-dependent size and temperature of the hot spots, in order to generate a kinetic model to describe reaction growth in plastic-bonded explosives (PBX). Here we use a recently developed technique where PBX is fabricated in the form of a thin wafer, embedded within a transparent polymer binder, and shocked with a laser-launched flyer plate that produces pressures of about 30 GPa range. In this method, every crystal of the cyclotetramethylene-tetranitramine (HMX)-based PBX can be observed during the shock. Hot spots can be seen via their thermal emission, which is detected with both a 32-channel optical pyrometer, which gives spatial-average temperatures and emissivities, and an eight-frame nanosecond camera that images hot spots directly with 2 um resolution. Using hyperspectral imaging, we acquire four pairs of time-resolved images using red and blue filters. With simultaneous two-color imaging we can watch temperature and emissivity change with time.
AB - Hot spots are formed when energetic microstructures are shocked, and they play a critical role in shock sensitivity. It is important to know both the time-dependent size and temperature of the hot spots, in order to generate a kinetic model to describe reaction growth in plastic-bonded explosives (PBX). Here we use a recently developed technique where PBX is fabricated in the form of a thin wafer, embedded within a transparent polymer binder, and shocked with a laser-launched flyer plate that produces pressures of about 30 GPa range. In this method, every crystal of the cyclotetramethylene-tetranitramine (HMX)-based PBX can be observed during the shock. Hot spots can be seen via their thermal emission, which is detected with both a 32-channel optical pyrometer, which gives spatial-average temperatures and emissivities, and an eight-frame nanosecond camera that images hot spots directly with 2 um resolution. Using hyperspectral imaging, we acquire four pairs of time-resolved images using red and blue filters. With simultaneous two-color imaging we can watch temperature and emissivity change with time.
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U2 - 10.1063/12.0032375
DO - 10.1063/12.0032375
M3 - Conference article
AN - SCOPUS:85213295077
SN - 0094-243X
VL - 3066
JO - AIP Conference Proceedings
JF - AIP Conference Proceedings
IS - 1
M1 - 490020
T2 - 23rd Biennial Conference of the APS Topical Group on Shock Compression of Condensed Matter, SCCM 2023
Y2 - 19 June 2023 through 23 June 2023
ER -