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Sensors 2017, 17(2), 248;

Ultrafast Fiber Bragg Grating Interrogation for Sensing in Detonation and Shock Wave Experiments

Los Alamos National Laboratory, Laboratory for Ultrafast Materials and Optical Science, MS K771, Los Alamos, NM 87545, USA
Los Alamos National Laboratory, DARHT Experiments and Diagnostics, MS P940, Los Alamos, NM 87545, USA
Author to whom correspondence should be addressed.
Received: 13 December 2016 / Accepted: 21 January 2017 / Published: 27 January 2017
(This article belongs to the Special Issue Recent Advances in Fiber Bragg Grating Sensing)
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Chirped fiber Bragg grating (CFBG) sensors coupled to high speed interrogation systems are described as robust diagnostic approaches to monitoring shock wave and detonation front propagation tracking events for use in high energy density shock physics applications. Taking advantage of the linear distributed spatial encoding of the spectral band in single-mode CFBGs, embedded fiber systems and associated photonic interrogation methodologies are shown as an effective approach to sensing shock and detonation-driven loading processes along the CFBG length. Two approaches, one that detects spectral changes in the integrated spectrum of the CFBG and another coherent pulse interrogation approach that fully resolves its spectral response, shows that 100-MHz–1-GHz interrogation rates are possible with spatial resolution along the CFBG in the 50 µm to sub-millimeter range depending on the combination of CFBG parameters (i.e., length, chirp rate, spectrum) and interrogator design specifics. Results from several dynamic tests are used to demonstrate the performance of these high speed systems for shock and detonation propagation tracking under strong and weak shock pressure loading: (1) linear detonation front tracking in the plastic bonded explosive (PBX) PBX-9501; (2) tracking of radial decaying shock with crossover to non-destructive CFBG response; (3) shock wave tracking along an aluminum cylinder wall under weak loading accompanied by dynamic strain effects in the CFBG sensor. View Full-Text
Keywords: fiber Bragg grating; fiber sensing; shock waves; detonation; high-speed interrogatio fiber Bragg grating; fiber sensing; shock waves; detonation; high-speed interrogatio

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Rodriguez, G.; Gilbertson, S.M. Ultrafast Fiber Bragg Grating Interrogation for Sensing in Detonation and Shock Wave Experiments. Sensors 2017, 17, 248.

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