Linear array transducer for high-power airborne ultrasound using flextensional structure

To change the direction of ultrasonic irradiation without moving a transducer, a high-power airborne ultrasonic transducer for a one-dimensional phased array system was designed and tested. A flextensional element transducer with higher-mode bending vibration was fabricated to obtain a high vibratio...

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Bibliographic Details
Published in:Japanese Journal of Applied Physics 2015-07, Vol.54 (7S1), p.7
Main Authors: Yamamoto, Jun, Mizuno, Yosuke, Tabaru, Marie, Nakamura, Kentaro
Format: Article
Language:English
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Summary:To change the direction of ultrasonic irradiation without moving a transducer, a high-power airborne ultrasonic transducer for a one-dimensional phased array system was designed and tested. A flextensional element transducer with higher-mode bending vibration was fabricated to obtain a high vibration amplitude over a wide aperture, where a phase-compensating stepped structure was employed. The width of the main lobe at half maximum and the sidelobe level were measured to be 14.3 deg and 0.78, respectively. The maximal sound pressure of 132 dB (0 dB re. 0.02 mPa) was obtained under the applied voltage of 4.0 V. The beam steering characteristics of a phased array using eight elements were compared with the simple theory.
ISSN:0021-4922
1347-4065
DOI:10.7567/JJAP.54.07HE16