Acoustic transducer

Patent · Sat Jan 01 00:00:00 EST 2000

OSTI ID:873382

Drumheller, Douglas S ^[1]

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1. Cedar Crest, NM

An active acoustic transducer tool for use down-hole applications. The tool includes a single cylindrical mandrel including a shoulder defining the boundary of a narrowed portion over which is placed a sandwich-style piezoelectric tranducer assembly. The piezoelectric transducer assembly is prestressed by being placed in a thermal interference fit between the shoulder of the mandrel and the base of an anvil which is likewise positioned over the narrower portion of the mandrel. In the preferred embodiment, assembly of the tool is accomplished using a hydraulic jack to stretch the mandrel prior to emplacement of the cylindrical sandwich-style piezoelectric transducer assembly and anvil. After those elements are positioned and secured, the stretched mandrel is allowed to return substantially to its original (pre-stretch) dimensions with the result that the piezoelectric transducer elements are compressed between the anvil and the shoulder of the mandrel.

• 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 6147932
• OSTI ID: 873382
• Country of Publication: United States
• Language: English

Related Subjects

acoustic
transducer
active
tool
down-hole
applications
single
cylindrical
mandrel
including
shoulder
defining
boundary
narrowed
portion
placed
sandwich-style
piezoelectric
tranducer
assembly
prestressed
thermal
interference
fit
base
anvil
likewise
positioned
narrower
preferred
embodiment
accomplished
hydraulic
jack
stretch
prior
emplacement
elements
secured
stretched
allowed
return
substantially
original
pre-stretch
dimensions
result
compressed
interference fit
acoustic transducer
preferred embodiment
piezoelectric transducer
transducer assembly
narrowed portion
cylindrical mandrel
thermal interference
active acoustic
transducer tool
down-hole applications
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