Abstract
A new rigid 24-element acoustic source receiver array in the 10 to 15 kHz frequency band has recently been developed [Folegot et al., submitted to OCEANS2005-Europe]. Despite of a height of 10 m, it has been specified to be easily deployed from a pier and to allow low cost at-sea experiments with water depth up to 12 m. The array has been deployed in a pool of 50 m length and 10 m depth, where calibrated surface plane waves have been generated. The objective of the trial was to undertake a first deployment of the system, to calibrate the instrument and provide some scientific results based on time reversal in a very controlled experimental setup. The Time Reversal Operator has been measured in several configurations. Subsequently, its eigenvectors associated with target reflections have been emitted by the mirror in order to focus separately on each target. The sensitivity of the method against target depth, target type, emission basis, and surface roughness has been investigated. The collected data will help to improve the understanding of environmental factors affecting acoustic propagation in the 10–15 kHz range and will make an important contribution to the development of advanced acoustic communications methods and tomographic capabilities.
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