Embedded fiber optic Bragg grating (FBG) detonation velocity sensor

Jerry Benterou; Corey V. Bennett; Garrett Cole; D. E. Hare; Chadd May; Eric Udd; Stephen J. Mihailov; Ping Lu

doi:10.1117/12.819208

27 April 2009 Embedded fiber optic Bragg grating (FBG) detonation velocity sensor

Jerry Benterou, Corey V. Bennett, Garrett Cole, D. E. Hare, Chadd May, Eric Udd, Stephen J. Mihailov, Ping Lu

Proceedings Volume 7316, Fiber Optic Sensors and Applications VI; 73160E (2009) https://doi.org/10.1117/12.819208
Event: SPIE Defense, Security, and Sensing, 2009, Orlando, Florida, United States

Abstract

In order to fully calibrate hydrocodes and dynamic chemistry burn models, initiation models and detonation models of high explosives, the ability to continuously measure the detonation velocity within an explosive is required. Progress on an embedded velocity diagnostic using a 125 micron diameter optical fiber containing a chirped fiber Bragg grating is reported. As the chirped fiber Bragg grating is consumed by the moving detonation wave, the physical length of the unconsumed Bragg grating is monitored with a fast InGaAs photodiode. Experimental details of the associated equipment and data in the form of continuous detonation velocity records within PBX-9502 are presented. This small diameter fiber sensor has the potential to measure internal detonation velocities on the order of 10 mm/μsec along path lengths tens of millimeters long.

Citation Download Citation

Jerry Benterou, Corey V. Bennett, Garrett Cole, D. E. Hare, Chadd May, Eric Udd, Stephen J. Mihailov, and Ping Lu "Embedded fiber optic Bragg grating (FBG) detonation velocity sensor", Proc. SPIE 7316, Fiber Optic Sensors and Applications VI, 73160E (27 April 2009); https://doi.org/10.1117/12.819208

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