Acoustic transducer
- Cedar Crest, NM
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.
- Research Organization:
- Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA (United States)
- DOE Contract Number:
- AC04-94AL85000
- Assignee:
- Sandia Corporation (Albuquerque, NM)
- Patent Number(s):
- US 5703836
- OSTI ID:
- 871300
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
transducer
comprising
one-piece
hollow
mandrel
outer
surface
formed
recess
perpendicular
central
axis
separated
distance
bottom
parallel
plurality
washer-shaped
discs
piezoelectric
material
disc
temperature-compensating
captured
pre-stressed
interference
fit
typically
2000
psi
compressive
stress
power
supply
means
connect
measurement
device
intended
telemetry
located
downhole
oil
gas
construction
stronger
fewer
joints
leak
fluids
holding
elements
found
previous
transducers
interference fit
piezoelectric element
acoustic transducer
central axis
outer surface
power supply
piezoelectric material
electric element
piezoelectric elements
compressive stress
device located
hollow mandrel
acoustic transducers
measurement device
transducer comprising
electric elements
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