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Title: Dynamic absorption in optical pyrometry of hot spots in plastic-bonded triaminotrinitrobenzene [Optical Pyrometry of Shock-induced Hot Spots in Plastic-bonded Triaminotrinitrobenzene]

Abstract

Herein we demonstrate a methodology for measuring optical pyrometry in environments which are disadvantageous for typical pyrometery applications by introducing additional fit parameters to account for absorption or emission which convolutes the thermal spectrum. Emission spectra from a plastic-bonded formulation of triaminotrinitrobenzene (TATB) shocked by 2-4 km s -1 impacts with Al flyer plates show significant deviations from graybody behavior. To extract reliable temperatures via optical pyrometry, we fit the spectra to a combination of a graybody and either a Gaussian absorption or emission spectrum. We found that the absorption needed to fit the data corresponds well with the known pressure-dependent absorption of TATB, and that the absorption model gives temperatures and emissivities in line with other explosives. By contrast, emission gives temperatures too low and emissivities that decrease as more material reacts. We conclude the nonthermal part of the spectrum is dominated by the absorption of unreacted TATB, and accurate pyrometry of TATB must use either our graybody plus absorption model or must limit the spectral range of observation to above 650 nm.

Authors:
 [1];  [2]; ORCiD logo [2]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Univ. of Illinois, Urbana-Champaign, IL (United States). School of Chemical Sciences and Fredrick Seitz Materials Research Lab.
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1518575
Report Number(s):
LLNL-JRNL-767687
Journal ID: ISSN 0003-6951; 958066
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 114; Journal Issue: 19; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Bassett, Will P., Johnson, Belinda P., and Dlott, Dana D. Dynamic absorption in optical pyrometry of hot spots in plastic-bonded triaminotrinitrobenzene [Optical Pyrometry of Shock-induced Hot Spots in Plastic-bonded Triaminotrinitrobenzene]. United States: N. p., 2019. Web. doi:10.1063/1.5092984.
Bassett, Will P., Johnson, Belinda P., & Dlott, Dana D. Dynamic absorption in optical pyrometry of hot spots in plastic-bonded triaminotrinitrobenzene [Optical Pyrometry of Shock-induced Hot Spots in Plastic-bonded Triaminotrinitrobenzene]. United States. doi:10.1063/1.5092984.
Bassett, Will P., Johnson, Belinda P., and Dlott, Dana D. Mon . "Dynamic absorption in optical pyrometry of hot spots in plastic-bonded triaminotrinitrobenzene [Optical Pyrometry of Shock-induced Hot Spots in Plastic-bonded Triaminotrinitrobenzene]". United States. doi:10.1063/1.5092984. https://www.osti.gov/servlets/purl/1518575.
@article{osti_1518575,
title = {Dynamic absorption in optical pyrometry of hot spots in plastic-bonded triaminotrinitrobenzene [Optical Pyrometry of Shock-induced Hot Spots in Plastic-bonded Triaminotrinitrobenzene]},
author = {Bassett, Will P. and Johnson, Belinda P. and Dlott, Dana D.},
abstractNote = {Herein we demonstrate a methodology for measuring optical pyrometry in environments which are disadvantageous for typical pyrometery applications by introducing additional fit parameters to account for absorption or emission which convolutes the thermal spectrum. Emission spectra from a plastic-bonded formulation of triaminotrinitrobenzene (TATB) shocked by 2-4 km s-1 impacts with Al flyer plates show significant deviations from graybody behavior. To extract reliable temperatures via optical pyrometry, we fit the spectra to a combination of a graybody and either a Gaussian absorption or emission spectrum. We found that the absorption needed to fit the data corresponds well with the known pressure-dependent absorption of TATB, and that the absorption model gives temperatures and emissivities in line with other explosives. By contrast, emission gives temperatures too low and emissivities that decrease as more material reacts. We conclude the nonthermal part of the spectrum is dominated by the absorption of unreacted TATB, and accurate pyrometry of TATB must use either our graybody plus absorption model or must limit the spectral range of observation to above 650 nm.},
doi = {10.1063/1.5092984},
journal = {Applied Physics Letters},
issn = {0003-6951},
number = 19,
volume = 114,
place = {United States},
year = {2019},
month = {5}
}

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Cited by: 3 works
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