Chirped Fiber Bragg Gratings for Distributed Detonation Velocity Measurements

Magne, Sylvain; Laffont, Guillaume; Ferdinand, Pierre; Barbarin, Y.; Lefrançois, Alexandre; Chuzeville, Vincent; Luc, J.; Woirin, Karol

doi:10.1364/bgpp.2016.bm5b.3

Cited by 2 publications

(4 citation statements)

References 5 publications

(5 reference statements)

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“…To avoid *yohan.barbarin@cea.fr; phone +33 5 65 10 55 99 possible light parasites, the reflected signal is filtered in the C-band. For more accuracy, the CFBG are characterized just before the experiments by an OFDR from LUNA Technologies to extract the CFBG chirp [6]. Figure 1.…”

Section: Shock Wave and Detonation Velocity Measurement 21 Concept Amentioning

confidence: 99%

Dynamic measurements of physical quantities in extreme environment using fiber Bragg grating

et al. 2017

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Fiber Bragg Gratings (FBGs) are used to measure shock velocity, detonation velocity, shock wave profile or pressure profile in inert and energetic materials. Such thin probe, with a diameter below 150 µm, can be inserted directly into materials without disturbing the physical phenomena. Chirped FBGs are used to track the shock wave in the grating using wavelengths. The velocity (few km/s) and shock wave profile measurements are realized by recording the CFBG's reflected spectral width. Pressure measurements at few GPa levels use dynamic spectrometers, two approaches are compared: parallel acquisition using an Arrayed-Waveguide-Grating and time-multiplexing by wavelength-to-time conversion using dispersion.

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Section: Shock Wave and Detonation Velocity Measurement 21 Concept Amentioning

confidence: 99%

Dynamic measurements of physical quantities in extreme environment using fiber Bragg grating

et al. 2017

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“…We propose a novel calibration method based on OFDR (optical frequency-domain reflectometry). It was very briefly introduced in Reference [14], and it is extensively presented in Section 4. It makes use of a Luna OBR 4600 equipment and has the advantages of being non-destructive, fast, and accurate in the space domain (0.01 mm).…”

Section: Introductionmentioning

confidence: 99%

“…It makes use of a Luna OBR 4600 equipment and has the advantages of being non-destructive, fast, and accurate in the space domain (0.01 mm). In return, the spatial uncertainty is conditioned by the uncertainty concerning the value of the effective index neff of the guided mode, France (CEA), Israel (NRC Soreq), China (BUAA), and England (AWE + ORC Southampton) reported results [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] over the last two decades. The measurement principle remains the following: a CFBG is either placed along or even inside an HE material as shown in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

“…Different HE material experimental configurations were tested at CEA Gramat and at CRB (Centre de Recherche du Bouchet, ArianeGoup) over the last decade [9,12,[14][15][16][17]25]. New experimental results, with uncertainty calculations, are presented in Section 6 of this paper: bare cylinder, wedges for shock-to-detonation transitions, and sphere configurations.…”

Section: Introductionmentioning

confidence: 99%

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

Barbarin

Lefrançois²,

Chuzeville³

et al. 2020

Sensors

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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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Chirped Fiber Bragg Gratings for Distributed Detonation Velocity Measurements

Cited by 2 publications

References 5 publications

Dynamic measurements of physical quantities in extreme environment using fiber Bragg grating

Dynamic measurements of physical quantities in extreme environment using fiber Bragg grating

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

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