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Title: Electromechanical transducer for acoustic telemetry system

Abstract

An improved electromechanical transducer is provided for use in an acoustic telemetry system. The transducer of this invention comprises a stack of ferroelectric ceramic disks interleaved with a plurality of spaced electrodes which are used to electrically pole the ceramic disks. The ceramic stack is housed in a metal tubular drill collar segment. The electrodes are preferably alternatively connected to ground potential and driving potential. This alternating connection of electrodes to ground and driving potential subjects each disk to an equal electric field; and the direction of the field alternates to match the alternating direction of polarization of the ceramic disks. Preferably, a thin metal foil is sandwiched between electrodes to facilitate the electrical connection. Alternatively, a thicker metal spacer plate is selectively used in place of the metal foil in order to promote thermal cooling of the ceramic stack.

Inventors:
 [1]
  1. (Cedar Crest, NM)
Issue Date:
Research Org.:
AT & T CORP
OSTI Identifier:
868823
Patent Number(s):
5222049
Assignee:
Teleco Oilfield Services Inc. (Meriden, CT) SNL
DOE Contract Number:  
AC04-76DP00789
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
electromechanical; transducer; acoustic; telemetry; improved; provided; comprises; stack; ferroelectric; ceramic; disks; interleaved; plurality; spaced; electrodes; electrically; pole; housed; metal; tubular; drill; collar; segment; preferably; alternatively; connected; ground; potential; driving; alternating; connection; subjects; disk; equal; electric; field; direction; alternates; match; polarization; foil; sandwiched; facilitate; electrical; thicker; spacer; plate; selectively; promote; thermal; cooling; spaced electrodes; ground potential; electric field; metal foil; electrical connection; acoustic telemetry; electromechanical transducer; mechanical transducer; /367/

Citation Formats

Drumheller, Douglas S. Electromechanical transducer for acoustic telemetry system. United States: N. p., 1993. Web.
Drumheller, Douglas S. Electromechanical transducer for acoustic telemetry system. United States.
Drumheller, Douglas S. Fri . "Electromechanical transducer for acoustic telemetry system". United States. https://www.osti.gov/servlets/purl/868823.
@article{osti_868823,
title = {Electromechanical transducer for acoustic telemetry system},
author = {Drumheller, Douglas S.},
abstractNote = {An improved electromechanical transducer is provided for use in an acoustic telemetry system. The transducer of this invention comprises a stack of ferroelectric ceramic disks interleaved with a plurality of spaced electrodes which are used to electrically pole the ceramic disks. The ceramic stack is housed in a metal tubular drill collar segment. The electrodes are preferably alternatively connected to ground potential and driving potential. This alternating connection of electrodes to ground and driving potential subjects each disk to an equal electric field; and the direction of the field alternates to match the alternating direction of polarization of the ceramic disks. Preferably, a thin metal foil is sandwiched between electrodes to facilitate the electrical connection. Alternatively, a thicker metal spacer plate is selectively used in place of the metal foil in order to promote thermal cooling of the ceramic stack.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1993},
month = {1}
}

Patent:

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