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US 6,310,426 B1Granted
High resolution focused ultrasonic transducer, for LWD method of making and using same
AssigneeHalliburton Energy Services, Inc.
InventorsJames R. Birchak, Alvin B. Miller, James W. Stroud
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Abstract
The present invention relates to transducer packages which utilize lenses made of unpoled piezoelectric material or machined metal coupled to an impedance matched backing. The new transducer packages have minimal reverberation which allow for nearer standoff measurements, improved bond measurements, the ability to detect of thinner cement layers behind casing, and provide for better estimations of formation surface texture.
Claims18
A transducer package comprising:
- (a) and active piezoelectric element;
- (b) an unpooled piezoelectric lens bonded to the active pieozoelectric element;
- and
- (c) an epoxy layer surrounding elements (a) and (b),
- wherein the thickness of the epoxy layer is dependent upon and matched to the acoustic impendance of a material being transmitted through.
2 more elements
A transducer package comprising:
- (a) and active piezoelectric element;
- (b) an unpooled piezoelectric lens bonded to the active pieozoelectric element;
- wherein the piezoelectric element and lens comprise a material selected from the group consisting of lead metaniobatye and lead zirconate titanate.
A transducer package comprising:
- (a) and active piezoelectric element;
- (b) a metal faceted lens bonded to the active piezoelectric element;
- and
- (c) an epoxy layer surrounding elements (a) and (b),
- wherein the thickness of the epoxy layer is dependent upon and matched to the impedance of a material being transmitted through.
2 more elements
A multi-element transducer package comprising:
- (a) a first transducer unit comprising a first wedge bonded to a first poled piezoelectric element bonded to a first backing;
- (b) a middle transducer unit comprising a second poled piezoelectric element bonded to a second backing;
- and
- (c) a second transducer unit comprising a second wedge bonded to a third poled piezoelectric element bonded to a third backing;
- wherein the first and second units are bonded to the middle unit such that the piezoelectric elements are isolated from each other;
- and
- wherein the backing material has an acoustic impedance similar to the piezoelectric elements.
4 more elements
Dependencies are inferred from the claim text.