Near-MHz temperature and H 2 O measurements in post-detonation fireballs of 25 g hemispherical explosives using scanned-wavelength-modulation spectroscopy
Abstract
A laser absorption spectroscopy diagnostic integrated within a hardened optical probe was used to measure temperature and water mole fraction at 500 kHz in post-detonation fireballs of explosives. In the experiments, an exploding-bridgewire detonator initiated a 25 g hemisphere of explosive (N5 or PETN). This produced a hemispherical fireball that traveled radially towards a hardened measurement probe. The probe contained a pressure transducer and optical equipment to pitch fiber-coupled laser light across a 12.6 cm gap onto a detector. Tunable diode lasers emitting near 7185.6 and were used to measure the absorbance spectrum of utilizing peak-picking scanned-wavelength-modulation spectroscopy with a scan frequency of 500 kHz and modulation frequencies of 35 and 45.5 MHz, respectively. This enabled measurements of temperature and in the shock-heated air and trailing fireball at 500 kHz. Time histories of pressure, temperature, and mole fraction were acquired at different standoff distances to quantify how the fireball evolved in space and time as well as to compare measured quantities between PETN and N5 fireballs. The standard deviation of temperature and during one representative test were found to be 17 K (1.3%) and 0.011 (5%), respectively. These measurements demonstrate this diagnostic’s ability to provide rapid and reliable measurements in harsh, highly transient post-detonation environments produced by solid explosives.
- Authors:
- Publication Date:
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1924599
- Grant/Contract Number:
- NA0003525
- Resource Type:
- Publisher's Accepted Manuscript
- Journal Name:
- Applied Optics
- Additional Journal Information:
- Journal Name: Applied Optics Journal Volume: 62 Journal Issue: 6; Journal ID: ISSN 1559-128X
- Publisher:
- Optical Society of America
- Country of Publication:
- United States
- Language:
- English
Citation Formats
Schwartz, Charles J., Stiborek, Joshua W., Butler, Austin, Chen, Damon, Guildenbecher, Daniel R., Welliver, Marc, Glumac, Nick, and Goldenstein, Christopher S. Near-MHz temperature and H 2 O measurements in post-detonation fireballs of 25 g hemispherical explosives using scanned-wavelength-modulation spectroscopy. United States: N. p., 2023.
Web. doi:10.1364/AO.479882.
Schwartz, Charles J., Stiborek, Joshua W., Butler, Austin, Chen, Damon, Guildenbecher, Daniel R., Welliver, Marc, Glumac, Nick, & Goldenstein, Christopher S. Near-MHz temperature and H 2 O measurements in post-detonation fireballs of 25 g hemispherical explosives using scanned-wavelength-modulation spectroscopy. United States. https://doi.org/10.1364/AO.479882
Schwartz, Charles J., Stiborek, Joshua W., Butler, Austin, Chen, Damon, Guildenbecher, Daniel R., Welliver, Marc, Glumac, Nick, and Goldenstein, Christopher S. Wed .
"Near-MHz temperature and H 2 O measurements in post-detonation fireballs of 25 g hemispherical explosives using scanned-wavelength-modulation spectroscopy". United States. https://doi.org/10.1364/AO.479882.
@article{osti_1924599,
title = {Near-MHz temperature and H 2 O measurements in post-detonation fireballs of 25 g hemispherical explosives using scanned-wavelength-modulation spectroscopy},
author = {Schwartz, Charles J. and Stiborek, Joshua W. and Butler, Austin and Chen, Damon and Guildenbecher, Daniel R. and Welliver, Marc and Glumac, Nick and Goldenstein, Christopher S.},
abstractNote = {A laser absorption spectroscopy diagnostic integrated within a hardened optical probe was used to measure temperature and water mole fraction at 500 kHz in post-detonation fireballs of explosives. In the experiments, an exploding-bridgewire detonator initiated a 25 g hemisphere of explosive (N5 or PETN). This produced a hemispherical fireball that traveled radially towards a hardened measurement probe. The probe contained a pressure transducer and optical equipment to pitch fiber-coupled laser light across a 12.6 cm gap onto a detector. Tunable diode lasers emitting near 7185.6 and 6806 c m − <#comment/> 1 were used to measure the absorbance spectrum of H 2 O utilizing peak-picking scanned-wavelength-modulation spectroscopy with a scan frequency of 500 kHz and modulation frequencies of 35 and 45.5 MHz, respectively. This enabled measurements of temperature and X H 2 O in the shock-heated air and trailing fireball at 500 kHz. Time histories of pressure, temperature, and H 2 O mole fraction were acquired at different standoff distances to quantify how the fireball evolved in space and time as well as to compare measured quantities between PETN and N5 fireballs. The standard deviation of temperature and X H 2 O during one representative test were found to be 17 K (1.3%) and 0.011 (5%), respectively. These measurements demonstrate this diagnostic’s ability to provide rapid and reliable measurements in harsh, highly transient post-detonation environments produced by solid explosives.},
doi = {10.1364/AO.479882},
journal = {Applied Optics},
number = 6,
volume = 62,
place = {United States},
year = {Wed Feb 15 00:00:00 EST 2023},
month = {Wed Feb 15 00:00:00 EST 2023}
}
https://doi.org/10.1364/AO.479882
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