Acoustic transducer with damping means

Electrical generator or motor structure – Educational or construction units or kits

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340 8FT, 310 92, 310 97, 310 87, H01L 4108

Patent

active

039899659

ABSTRACT:
An ultrasonic transducer specifically suited to high temperature sodium applications is described. A piezoelectric active element is joined to the transducer faceplate by coating the faceplate and juxtaposed active element face with wetting agents specifically compatible with the bonding procedure employed to achieve the joint. The opposite face of the active element is fitted with a backing member designed to assure continued electrical continuity during adverse operating conditions which can result in the fracturing of the active element. The fit is achieved employing a spring-loaded electrode operably arranged to electrically couple the internal transducer components, enclosed in a hermetically sealed housing, to accessory components normally employed in transducer applications.
Two alternative backing members are taught for assuring electrical continuity. The first employs a resilient, discrete multipoint contact electrode in electrical communication with the active element face. The second employs a resilient, elastomeric, electrically conductive, damped member in electrical communication with the active element face in a manner to effect ring-down of the transducer. Each embodiment provides continued electrical continuity within the transducer in the event the active element fractures, while the second provides the added benefit of damping.

REFERENCES:
patent: 1588176 (1926-06-01), Ellis
patent: 2728869 (1955-12-01), Pohlman
patent: 2803129 (1957-08-01), Bradfield
patent: 3299301 (1967-01-01), Heilmann et al.
patent: 3376438 (1968-04-01), Colbert
patent: 3409869 (1968-11-01), McCool
patent: 3586889 (1971-06-01), Kolter
patent: 3794866 (1974-02-01), McElroy et al.

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