Acoustic transducer

Details Acoustic transducer Acoustic transducer

1996-03-21

1997-12-30

Lobo, Ian J.

Communications, electrical: acoustic wave systems and devices

Signal transducers

Underwater type

367 82, 367157, H04R 1700

Patent

active

057038368

ABSTRACT:
An acoustic transducer comprising a one-piece hollow mandrel into the outer surface of which is formed a recess with sides perpendicular to the central axis of the mandrel and separated by a first distance and with a bottom parallel to the central axis and within which recess are a plurality of washer-shaped discs of a piezoelectric material and at least one disc of a temperature-compensating material with the discs being captured between the sides of the recess in a pre-stressed interference fit, typically at 2000 psi of compressive stress. The transducer also includes a power supply and means to connect to a measurement device. The transducer is intended to be used for telemetry between a measurement device located downhole in an oil or gas well and the surface. The transducer is of an construction that is stronger with fewer joints that could leak fluids into the recess holding the piezoelectric elements than is found in previous acoustic transducers.

REFERENCES:
patent: 3673442 (1972-06-01), Sonderegger
patent: 3968473 (1976-07-01), Patton et al.
patent: 4518888 (1985-05-01), Zabcik
patent: 5222049 (1993-06-01), Drumheller
patent: 5357486 (1994-10-01), Pearce

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