A CYLINDRICAL PARABOLIC REFLECTOR FOR USE WITH PIEZOELECTRIC CYLINDRICAL TRANSDUCERS, AS APPLIED TO LATERAL ECHO UNDERWATER SURVEY
COLUMBIA UNIV DOBBS FERRY NY HUDSON LABS
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A parabolic lead reflector designed for creating a narrow sound beam at an underwater frequency of 30.5 kHz from an array of cylindrical ceramic piezoelectric crystals is described. The reflector consists of sheet lead 14- in. thick, backed by an aluminum stiffener sheet, 18-in. thick. Brackets for supporting the cylindrical crystal assembly are positioned at three points along the focal axis of the reflector. Clamping brackets for holding the cylindrical transducer are used to secure the transducer to the mounting brackets along the reflector axis. The cylindrical transducer assembly consists of 18 ceramic, lead zirconate cylinders, 1-12 in. O.D. and 2-12 in. long. The cylinders are cemented end to end to form a single, long, cylinder transducer. The oil reservoir maintains pressure balance in the transducer as the transducer is raised or lowered or varies in depth during submerged towing.
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