Acoustic transducer with piezoelectric elements having different polarities
AssigneeHalliburton Energy Services, Inc.
InventorsJiajun Zhao, Jing Jin, Ruijia Wang, Chung Chang
Life of this patent
Estimating the term…
Abstract
An acoustic transducer includes a substrate element having a first side, and a second side opposite the first side. The acoustic transducer also includes first and second piezoelectric elements coupled to the first side, and third and fourth piezoelectric elements coupled to the second side. The first piezoelectric element has a first polarity, and the second piezoelectric element has a second polarity different than the first polarity. The third piezoelectric element has a third polarity, and the fourth piezoelectric element has a fourth polarity different than the third polarity.
Claims20
An acoustic transducer, comprising:
- a substrate element having a first side and a second side, wherein the second side is opposite the first side;
- a first piezoelectric element coupled to the first side, the first piezoelectric element having a first polarity;
- a second piezoelectric element coupled to the first side, the second piezoelectric element having a second polarity, wherein the second polarity is different than the first polarity;
- a third piezoelectric element coupled to the second side, the third piezoelectric element having a third polarity;
- a fourth piezoelectric element coupled to the second side, the fourth piezoelectric element having a fourth polarity, wherein the fourth polarity is different than the third polarity;
- a first constraining layer on an outer surface of the first piezoelectric element;
- a second constraining layer on an outer surface of the second piezoelectric element;
- a third constraining layer on an outer surface of the third piezoelectric element;
- and
- a fourth constraining layer on an outer surface of the fourth piezoelectric element.
A method utilizing an acoustic logging tool within a borehole, the method comprising:
- deploying the acoustic logging tool into the borehole, the acoustic logging tool having an
- acoustic transducer including:
- a substrate element having a first side and a second side, wherein the second side is opposite the first side;
- a first piezoelectric element coupled to the first side, the first piezoelectric element having a first polarity;
- a second piezoelectric element coupled to the first side, the second piezoelectric element having a second polarity, wherein the second polarity is different than the first polarity;
- a third piezoelectric element coupled to the second side, the third piezoelectric element having a third polarity;
- a fourth piezoelectric element coupled to the second side, the fourth piezoelectric element having a fourth polarity, wherein the fourth polarity is different than the third polarity;
- a first constraining layer on an outer surface of the first piezoelectric element;
- a second constraining layer on an outer surface of the second piezoelectric element;
- a third constraining layer on an outer surface of the third piezoelectric element;
- and
- a fourth constraining layer on an outer surface of the fourth piezoelectric element;
- providing a same voltage signal to each of the first through fourth piezoelectric elements to produce an acoustic force along the borehole;
- and
- processing a received acoustic response to the produced acoustic force to determine properties of formations surrounding the borehole.
Dependencies are inferred from the claim text.