Abstract
Low‐impedance acoustic baffles are often used to shield hydrophones from unwanted noise. However, when the hydrophones must be located close to such low‐impedance surfaces, the resulting loss in signal sensitivity can lead to a decrease in signal‐to‐noise ratio. Several techniques have been devised to maintain the signal sensitivity of hydrophones in these instances. The theoretical performance characteristics of several such signal conditioning techniques have been examined. Results are presented for the following types: (1) mass layer, (2) hydrophone standoff, (3) a single homogeneous absorptive layer, (4) combinations of mass layers, standoff, and tuned compliant layers, and (5) superdirective hydrophones. In every case the low‐frequency signal conditioning performance is determined by the total mass of the signal conditioning treatment.
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