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Title: Acoustic transducer

Abstract

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.

Inventors:
 [1]
  1. (Cedar Crest, NM)
Publication Date:
Research Org.:
SANDIA CORP
OSTI Identifier:
873382
Patent Number(s):
US 6147932
Assignee:
Sandia Corporation (Albuquerque, NM) SNL
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
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; /367/

Citation Formats

Drumheller, Douglas S. Acoustic transducer. United States: N. p., 2000. Web.
Drumheller, Douglas S. Acoustic transducer. United States.
Drumheller, Douglas S. Sat . "Acoustic transducer". United States. doi:. https://www.osti.gov/servlets/purl/873382.
@article{osti_873382,
title = {Acoustic transducer},
author = {Drumheller, Douglas S.},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Jan 01 00:00:00 EST 2000},
month = {Sat Jan 01 00:00:00 EST 2000}
}

Patent:

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