Hydrophone structure with center pin
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United States of America Patent
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-
Oct 14, 1997
Grant Date -
N/A
app pub date -
Dec 27, 1995
filing date -
Dec 27, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An active element in a hydrophone includes a piezoelectric hydrophone crystal mounted to a backing plate. The piezoelectric crystal may divided into separate segments. If so segmented, the polarities of the segments are oriented in the same direction. Whether or not segmented, the center portion or segment of the crystal is supported in part by a center pin at its center. Thus, in the presence of a downward pressure, the end portions or segments develop a concave flexure and the center segment, due to the center pin support, develops a convex flexure. With this reverse flexing phenomenon, the center portion segment develops an electrical signal of opposite polarity from those of the end segments. By carefully selecting the areas of the end segments, and electrically coupling the segments so that the harmonics of the various segments are added out of phase, the distortion introduced the harmonics of the various phases subtract. The relative strengths of the signals from the segments may tailored by adjusting the areas of the segments.
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