100-MHz ultrasonic linear array transducers based on polyurea-film

Eight- and 32-element ultrasonic array transducers using polyurea films are fabricated and experimentally tested in this study. Aromatic polyurea thin films, prepared by vapor deposition polymerization, are suitable for use as an ultrasonic transducer. In this paper, we present two types of polyurea...

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Bibliographic Details
Published in:Acoustical Science and Technology 2015/02/01, Vol.36(2), pp.139-148
Main Authors: Nakazawa, Marie, Tabaru, Masaya, Takayasu, Toshiki, Aoyagi, Takahiro, Nakamura, Kentaro
Format: Article
Language:English
Subjects:
Arrays
Electrodes
High-frequency
Lithography
Miniature
Phased array
Piezoelectric polymer
Polymerization
Polyurea film
Polyureas
Thin films
Transducers
Ultrasonic array transducer
Vapor deposition
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Summary:Eight- and 32-element ultrasonic array transducers using polyurea films are fabricated and experimentally tested in this study. Aromatic polyurea thin films, prepared by vapor deposition polymerization, are suitable for use as an ultrasonic transducer. In this paper, we present two types of polyurea array transducer with 20 and 200 μm pitches. The polyurea films were prepared through vapor deposition polymerization, and miniature electrode arrays were fabricated by a lithographic technique. Resonance frequencies of approximately 30, 65, and 100 MHz were observed in the electrical admittance. To examine the performances of the prototype array transducers, a pulse/echo test and phased array experiment were performed. From the experimental results, we found that the polyurea array transducers fabricated by the proposed method correctly operated as expected.
ISSN:1346-3969
1347-5177
DOI:10.1250/ast.36.139