Direct monitoring of underwater ultrasonic transducers in the near field using fibre Bragg grating sensors

Flockhart, Gordon M. H.; McGuire, Michelle; Pierce, S. Gareth; Thursby, Graham; Stewart, George; Hayward, G.; Culshaw, Brian

doi:10.1117/12.835468

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“…The fiber Bragg grating (FBG) strain sensor has been investigated for measurement of ultrasonics in water [4][5][6]. Fabry-Perot sensors based on an air-backed diaphragm formed on the tip of an optical fiber have been reported for measurement of blast-driven shock waves in air [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Characterization of laser-driven shock waves in solids using a fiber optic pressure probe

et al. 2013

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Measurement of laser-driven shock wave pressure in solid blocks of polymethyl methacrylate is demonstrated using fiber optic pressure probes. Three probes based on a fiber Fabry-Perot, fiber Bragg grating, and interferometric fiber tip sensor are tested and compared. Shock waves are generated using a high-power laser focused onto a thin foil target placed in close proximity to the test blocks. The fiber Fabry-Perot sensor appears capable of resolving the shock front with a rise time of 91 ns. The peak pressure is estimated, using a separate shadowgraphy measurement, to be 3.4 GPa.

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