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

Bassett, Will P.; Johnson, Belinda P.; Dlott, Dana D.

doi:10.1063/1.5092984

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

Journal Article · Mon May 13 00:00:00 EDT 2019 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.5092984· OSTI ID:1518575

Bassett, Will P. ^[1]; Johnson, Belinda P. ^[2];

^[2]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Univ. of Illinois, Urbana-Champaign, IL (United States). School of Chemical Sciences and Fredrick Seitz Materials Research Lab.

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.

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Research Organization:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1518575

Report Number(s):: LLNL-JRNL-767687; 958066

Journal Information:: Applied Physics Letters, Vol. 114, Issue 19; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 19 works

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References (15)

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Shock Initiation Microscopy with High Time and Space Resolution Bassett, Will P.; Johnson, Belinda P.; Salvati, Lawrence Propellants, Explosives, Pyrotechnics, Vol. 45, Issue 2 https://doi.org/10.1002/prep.201900222	journal	November 2019
Hot Spot Chemistry in Several Polymer‐Bound Explosives under Nanosecond Shock Conditions Bassett, Will P.; Johnson, Belinda P.; Dlott, Dana D. Propellants, Explosives, Pyrotechnics, Vol. 45, Issue 2 https://doi.org/10.1002/prep.201900249	journal	November 2019

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