Engineered Acoustic Sensors for Underwater Applications Based on Coated Fiber Bragg Gratings
In this work, we report on experimental results obtained with hydrophones based on fiber-Bragg-grating (FBG) for underwater acoustic detection in the frequency range 4–35kHz. The investigated optical hydrophones consist of FBG sensors coated with cylindrically-shaped coatings with different diameters and materials. Coating materials have been selected through an appropriate choice of their acousto-mechanical properties to provide mechanical amplification of sound pressure in specific frequency ranges. Experimental results demonstrated the expected resonant behavior of such devices (recently demonstrated via numerical simulations but not yet validated experimentally) and their excellent capability to detect acoustic waves in the investigated frequency range.
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