An optical fibre hydrophone for the measurement and detection of ultrasound is described. The active sensing element consists of a low finesse Fabry-Perot polymer film interferometer bonded to the tip of an optical fibre, of 50 µm core diameter and 0.25 mm outer diameter. Sensitivity was found to be 114 mV/MPa with an acoustic noise floor of 15 kPa over a 25 MHz bandwidth.
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Beard et al. (1997) studied this question.
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