Dynamic Measurements of Physical Quantities in Extreme Environment using Fiber Bragg Grating

Yohan Barbarin (1) , A. Lefrançois (1) , Sylvain Magne (2) , V. Chuzeville (1) , M. Balbarie (1) , L. Jacquet (1) , F. Sinatti (1) , A. Osmont (1) , J. Luc (1)

1 DAM/GRAMAT - GRAMAT
2 LCFO - Laboratoire Capteurs Fibres Optiques

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.

Keywords: detonation; instrumentation; Optical Fiber Sensor; sensor; Distributed and Quasi-distributed sensing; Shock; High pressure; High Explosives; Velocimetry; Dynamic Spectrometer; Spectrometry; detonics; Chirped FBG; Fiber Bragg Grating

Domains: Instrumentation and Detectors [physics.ins-det]; Optics / Photonic; Structural mechanics [physics.class-ph]

Yohan Barbarin, A. Lefrançois, Sylvain Magne, V. Chuzeville, M. Balbarie, et al.. Dynamic Measurements of Physical Quantities in Extreme Environment using Fiber Bragg Grating. 25th International Conference on Optical Fiber Sensors, Apr 2017, Jeju, South Korea. pp.103234K, ⟨10.1117/12.2265670⟩. ⟨cea-02549087⟩