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

1
CEA, DAM, GRAMAT, BP 80200, F-46500 Gramat, France
2
CEA, LIST, Laboratoire Capteurs Fibres Optiques, F-91191 Gif-sur-Yvette, France
3
Formerly at ArianeGroup\CRB, F-91710 Vert-le-Petit, France
*
Author to whom correspondence should be addressed.
Sensors 2020, 20(4), 1026; https://doi.org/10.3390/s20041026
Received: 13 January 2020 / Revised: 6 February 2020 / Accepted: 10 February 2020 / Published: 14 February 2020
(This article belongs to the Section Optical Sensors)
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. View Full-Text
Keywords: fiber Bragg grating (FBG), chirped FBG; high explosive; shock; detonation; velocity measurement fiber Bragg grating (FBG), chirped FBG; high explosive; shock; detonation; velocity measurement
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Barbarin, Y.; Lefrançois, A.; Chuzeville, V.; Magne, S.; Jacquet, L.; Elia, T.; Woirin, K.; Collet, C.; Osmont, A.; Luc, J. Development of a Shock and Detonation Velocity Measurement System Using Chirped Fiber Bragg Gratings. Sensors 2020, 20, 1026.

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