Focal Length Controllable Ultrasonic Transducer Using Bimorph-Type Bending Actuator

Autor:	Kang-Lyeol Ha, Moo-Joon Kim, Chai-Bong Lee, Min-Ku Chae
Rok vydání:	2003
Předmět:	Materials science Physics and Astronomy (miscellaneous) Acoustics General Engineering General Physics and Astronomy Bimorph Curvature Polyvinylidene fluoride Piezoelectricity chemistry.chemical_compound Transducer chemistry Focal length Ultrasonic sensor Actuator
Zdroj:	Japanese Journal of Applied Physics. 42:3091-3092
ISSN:	1347-4065 0021-4922
DOI:	10.1143/jjap.42.3091
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::839c158ca4b30548d1894d254924a118 https://doi.org/10.1143/jjap.42.3091 Zobrazit plný text záznamu