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:
-
- Cedar Crest, NM
- Issue Date:
- Research Org.:
- AT&T
- OSTI Identifier:
- 868823
- Patent Number(s):
- 5222049
- Assignee:
- Teleco Oilfield Services Inc. (Meriden, CT)
- Patent Classifications (CPCs):
-
B - PERFORMING OPERATIONS B06 - GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL B06B - METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, {e.g.} FOR PERFORMING MECHANICAL WORK IN GENERAL
E - FIXED CONSTRUCTIONS E21 - EARTH DRILLING E21B - EARTH DRILLING, e.g. DEEP DRILLING
- 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 = {Fri Jan 01 00:00:00 EST 1993},
month = {Fri Jan 01 00:00:00 EST 1993}
}