Acoustic transducer for sending and receiving acoustic communica

Details Acoustic transducer for sending and receiving acoustic communica Acoustic transducer for sending and receiving acoustic communica

1991-10-03

1992-10-27

Pihulic, Daniel T.

Communications, electrical: acoustic wave systems and devices

Underwater system

Analog speech communication

367134, 367165, H04B 1100

Patent

active

051595800

ABSTRACT:
A uniquely designed acoustic transducer comprising a stack of piezoceramic elements (other piezoelectric materials may be used) mounted upon a tuned, shaped transmit/receive head made of hardened metal alloy. The ceramic stack is preloaded to the head via a stress bolt. Insulator electrodes used in the ceramic stack are selected to minimize compliance in the stack for maximum efficiency. All the material properties, sizes, weights, etc., as well as the overall transducer design are carefully selected to act in combination to match the impedance of the load (i.e. metal structural framework). The diameter of the tip of the tuned, shaped driving head is sized such that when clamped to a metal framework, the base metal of the material just under the tip is compressed to or slightly beyond its yield point. This eliminates the requirement for surface preparation because any coatings will be displaced under the applied pressure and any surface irregularities will be flattened out. The underside of the clamping member used to hold the transducer assembly in place consists of a half wave length reflecting waveguide designed to reflect any absorbed energy back into the load. Thus, the attachment points for both the reflector and the transducer head of the clamping device effectively appear invisible to the driving transducer under load.

REFERENCES:
patent: 2172066 (1939-09-01), Logsdon et al.
patent: 4213199 (1980-07-01), Labaw et al.

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