Fiber Bragg Grating Dynamic Extensometry on Metallic Samples submitted to High Pulse Power Magnetic Fields

Sylvain Magne (1) , Simon Nehr (1) , Nicolas Roussel (1) , Guillaume Laffont (1) , G. Le Blanc (2) , Yohan Barbarin (2) , J. Luc (2) , O. Lassalle (2) , F. Sinatti (2)

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

Isentropic compression of metallic samples under High Pulse Powers (HPPs) are performed at CEA-Gramat. Large strains and high strain rates are obtained under intense magnetic field-driven Laplace forces. On account on electromagnetic immunity, a dedicated Fiber Bragg Grating (FBG) mainframe was designed by CEA LIST. Ring aluminum samples with crossed FBGs bonded onto the external surface were tested on the CYCLOPE HPP facility. Dynamic strain measurements were performed along with Photonic-Doppler Velocimetry (PDV). FBG strain data compare well to strain data derived from PDV displacements, leading the way to direct dynamic extensometry in the purpose of improving Magneto-Hydro-Dynamics (MHD) codes.

Keywords: Distributed and Quasi-distributed sensing; Optical Fiber Sensor; sensor; instrumentation; Strain measurement; Fiber Bragg grating; High speed photography; Magnetic fields; Spatial resolution; Spontaneous emission; OCIS codes: (1200120) Instrumentation; measurement; and metrology; (0603735) Fiber Bragg Gratings

Domains: Physics [physics]; Physics [physics]; Instrumentation and Detectors [physics.ins-det]; Physics [physics]; Physics [physics]; Optics [physics.optics]; Physics [physics]; Mechanics [physics]; Solid mechanics [physics.class-ph]

Sylvain Magne, Simon Nehr, Nicolas Roussel, Guillaume Laffont, G. Le Blanc, et al.. Fiber Bragg Grating Dynamic Extensometry on Metallic Samples submitted to High Pulse Power Magnetic Fields. Bragg Gratings, Photosensitivity and Poling in Glass Waveguides and Materials, Jul 2018, Zurich, Switzerland. pp.BM4A.4, ⟨10.1364/BGPPM.2018.BM4A.4⟩. ⟨cea-01919666⟩