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Development of a Shock and Detonation Velocity Measurement System Using Chirped Fiber Bragg Gratings

Dynamic measurements of shock and detonation velocities are performed using long chirped fiber Bragg gratings (CFBGs). Such thin probes, with a diameter of typically 125 µm or even 80 µm can be directly inserted into high-explosive (HE) samples or simply glued laterally. During the detonation, the w...

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Autores principales: Barbarin, Yohan, Lefrançois, Alexandre, Chuzeville, Vincent, Magne, Sylvain, Jacquet, Laurent, Elia, Thomas, Woirin, Karol, Collet, Christelle, Osmont, Antoine, Luc, Jérôme
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7070336/
https://www.ncbi.nlm.nih.gov/pubmed/32074991
http://dx.doi.org/10.3390/s20041026
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author Barbarin, Yohan
Lefrançois, Alexandre
Chuzeville, Vincent
Magne, Sylvain
Jacquet, Laurent
Elia, Thomas
Woirin, Karol
Collet, Christelle
Osmont, Antoine
Luc, Jérôme
author_facet Barbarin, Yohan
Lefrançois, Alexandre
Chuzeville, Vincent
Magne, Sylvain
Jacquet, Laurent
Elia, Thomas
Woirin, Karol
Collet, Christelle
Osmont, Antoine
Luc, Jérôme
author_sort Barbarin, Yohan
collection PubMed
description Dynamic measurements of shock and detonation velocities are performed using long chirped fiber Bragg gratings (CFBGs). Such thin probes, with a diameter of typically 125 µm or even 80 µm can be directly inserted into high-explosive (HE) samples or simply glued laterally. During the detonation, the width of the optical spectrum is continuously reduced by the propagation of the wave-front, which physically shortens the CFBG. The light power reflected back shows a ramp-down type signal, from which the wave-front position is obtained as a function of time, thus yielding a detonation velocity profile. A calibration procedure was developed, with the support of optical simulations, to cancel out the optical spectrum distortions from the different optical components and to determine the wavelength-position transfer function of the CFBG. The fitted slopes of the X–T diagram give steady detonation velocity values which are in very good agreement with the classical measurements obtained from discrete electrical shorting pins (ESP). The main parameters influencing the uncertainties on the steady detonation velocity value measured by CFBG are discussed. To conclude, different HE experimental configurations tested at CEA (Commissariat à l’Energie Atomique et aux Energies Alternatives) are presented: bare cylindrical sticks, wedges for shock-to-detonation transitions (SDT), spheres, a cast-cured stick around a CFBG, and a detonation wave-front profile configuration.
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spelling pubmed-70703362020-03-19 Development of a Shock and Detonation Velocity Measurement System Using Chirped Fiber Bragg Gratings Barbarin, Yohan Lefrançois, Alexandre Chuzeville, Vincent Magne, Sylvain Jacquet, Laurent Elia, Thomas Woirin, Karol Collet, Christelle Osmont, Antoine Luc, Jérôme Sensors (Basel) Article Dynamic measurements of shock and detonation velocities are performed using long chirped fiber Bragg gratings (CFBGs). Such thin probes, with a diameter of typically 125 µm or even 80 µm can be directly inserted into high-explosive (HE) samples or simply glued laterally. During the detonation, the width of the optical spectrum is continuously reduced by the propagation of the wave-front, which physically shortens the CFBG. The light power reflected back shows a ramp-down type signal, from which the wave-front position is obtained as a function of time, thus yielding a detonation velocity profile. A calibration procedure was developed, with the support of optical simulations, to cancel out the optical spectrum distortions from the different optical components and to determine the wavelength-position transfer function of the CFBG. The fitted slopes of the X–T diagram give steady detonation velocity values which are in very good agreement with the classical measurements obtained from discrete electrical shorting pins (ESP). The main parameters influencing the uncertainties on the steady detonation velocity value measured by CFBG are discussed. To conclude, different HE experimental configurations tested at CEA (Commissariat à l’Energie Atomique et aux Energies Alternatives) are presented: bare cylindrical sticks, wedges for shock-to-detonation transitions (SDT), spheres, a cast-cured stick around a CFBG, and a detonation wave-front profile configuration. MDPI 2020-02-14 /pmc/articles/PMC7070336/ /pubmed/32074991 http://dx.doi.org/10.3390/s20041026 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Barbarin, Yohan
Lefrançois, Alexandre
Chuzeville, Vincent
Magne, Sylvain
Jacquet, Laurent
Elia, Thomas
Woirin, Karol
Collet, Christelle
Osmont, Antoine
Luc, Jérôme
Development of a Shock and Detonation Velocity Measurement System Using Chirped Fiber Bragg Gratings
title Development of a Shock and Detonation Velocity Measurement System Using Chirped Fiber Bragg Gratings
title_full Development of a Shock and Detonation Velocity Measurement System Using Chirped Fiber Bragg Gratings
title_fullStr Development of a Shock and Detonation Velocity Measurement System Using Chirped Fiber Bragg Gratings
title_full_unstemmed Development of a Shock and Detonation Velocity Measurement System Using Chirped Fiber Bragg Gratings
title_short Development of a Shock and Detonation Velocity Measurement System Using Chirped Fiber Bragg Gratings
title_sort development of a shock and detonation velocity measurement system using chirped fiber bragg gratings
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7070336/
https://www.ncbi.nlm.nih.gov/pubmed/32074991
http://dx.doi.org/10.3390/s20041026
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