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Monday, July 8 • 11:40 - 12:00
MEASUREMENT AND RECONSTRUCTION OF UNDERWATER ACOUSTIC DISTRIBUTION USING OPTICAL AND TOMOGRAPHIC TECHNIQUES

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The distribution of underwater acoustic field is traditionally measured by a scanning hydrophone or a hydrophone array, which would both perturb the acoustic field. Optical technique provides an alternative way to measure underwater acoustic noninvasive. As such, an optical measurement system for underwater acoustic field is implemented in an anechoic water tank. This system is based on the so-called acousto-optic interaction between an optical beam and the acoustic field, and it uses a laser Doppler vibrometer (LDV) to measure the rate of change of optical path length caused by the presence of the acoustic field. Then processed by a tomographic technique, the underwater acoustic field could be reconstructed without perturbation. Three piston transducers covering the frequency range 100 to 500 kHz are utilized to validate the optical measurement system. The reconstructed acoustic distributions obtained by the LDV are also compared with the scanning results of a hydrophone at the same plane, and good agreements are observed in the frequency range of interest.


Monday July 8, 2019 11:40 - 12:00 EDT
Westmount 5
  T12 Underwater & marit. noise, SS01 … underwater snd measur & monit