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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 (BASEL, SWITZERLAND) 2020; 20:s20041026. [PMID: 32074991 PMCID: PMC7070336 DOI: 10.3390/s20041026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/13/2020] [Revised: 02/06/2020] [Accepted: 02/10/2020] [Indexed: 06/10/2023]
Abstract
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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Affiliation(s)
- Yohan Barbarin
- CEA, DAM, GRAMAT, BP 80200, F-46500 Gramat, France; (A.L.); (V.C.); (L.J.); (T.E.); (A.O.); (J.L.)
| | - Alexandre Lefrançois
- CEA, DAM, GRAMAT, BP 80200, F-46500 Gramat, France; (A.L.); (V.C.); (L.J.); (T.E.); (A.O.); (J.L.)
| | - Vincent Chuzeville
- CEA, DAM, GRAMAT, BP 80200, F-46500 Gramat, France; (A.L.); (V.C.); (L.J.); (T.E.); (A.O.); (J.L.)
| | - Sylvain Magne
- CEA, LIST, Laboratoire Capteurs Fibres Optiques, F-91191 Gif-sur-Yvette, France;
| | - Laurent Jacquet
- CEA, DAM, GRAMAT, BP 80200, F-46500 Gramat, France; (A.L.); (V.C.); (L.J.); (T.E.); (A.O.); (J.L.)
| | - Thomas Elia
- CEA, DAM, GRAMAT, BP 80200, F-46500 Gramat, France; (A.L.); (V.C.); (L.J.); (T.E.); (A.O.); (J.L.)
| | - Karol Woirin
- Formerly at ArianeGroup\CRB, F-91710 Vert-le-Petit, France; (K.W.); (C.C.)
| | - Christelle Collet
- Formerly at ArianeGroup\CRB, F-91710 Vert-le-Petit, France; (K.W.); (C.C.)
| | - Antoine Osmont
- CEA, DAM, GRAMAT, BP 80200, F-46500 Gramat, France; (A.L.); (V.C.); (L.J.); (T.E.); (A.O.); (J.L.)
| | - Jérôme Luc
- CEA, DAM, GRAMAT, BP 80200, F-46500 Gramat, France; (A.L.); (V.C.); (L.J.); (T.E.); (A.O.); (J.L.)
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