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US 3,947,802 AGranted
Omnidirectional low noise piezoelectric transducer
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorsAllan C. Tims, Theodore A. Henriquez
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Abstract
A piezoelectric ceramic transducer assembly for broadband noise-measuring drophone. A longitudinally polarized lead zirconate-titanate cylinder provided with end caps is sealed by O-rings within a circumferentially polarized lead zirconate-titanate cylinder providing high sensitivity, smooth response, omnidirectionality, and stability with temperature and hydrostatic pressure variations.
Claims2
An electroacoustic transducer which comprises,
- a circumferentially polarized piezoelectric cylinder,
- a longitudinally polarized piezoelectric cylinder sealingly capped by two concentric imperforate diaphragms,
- and isolation means sealingly mounting said longitudinally polarized cylinder and diaphragms concentrically within said circumferentially polarized cylinder,
- said isolation means cooperating only radially between said diaphragms and the inner ends of said circumferentially polarized cylinder.
1 more element
Dependencies are inferred from the claim text.