Focal Length Controllable Ultrasonic Transducer Using Bimorph-Type Bending Actuator
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概要
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Using a bimorph-type bending actuator, we propose a new method for controlling the focal length of a transducer by electric DC voltage. We designed two focal length controllable ultrasonic transducers with actuators, a line-focus and a point-focus transducer. The polyvinylidene fluoride (PVDF) piezoelectric type polymer film is used for transmitting and receiving of ultrasonic signals. Using the new method, it is confirmed by investigation of the underwater acoustic field that the focal length can be controlled to within 10% of the radius of the transducer curvature.
- 2003-05-15
著者
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Lee Chai-bong
Division Of Information Systems Engineering Dongseo University
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Ha Kang-lyeol
Department Of Electrical Engineering Faculty Of Engineering Tohoku University
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Kim Moo-joon
Department Of Physics College Of Natural Sciences Pukyong National University
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CHAE Min-Ku
Department of Acoustics and Vibration Engineering, Pukyong National University
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Chae Min-Ku
Department of Acoustics and Vibration Engineering, Pukyong National University, Busan 608-737,Korea
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Lee Chai-Bong
Division of Information Systems Engineering, Dongseo University, Busan 617-833, Korea
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Kim Moo-Joon
Department of Physics, College of Natural Sciences, Pukyong National University, Busan 608-737, Korea
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