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Directivity Characteristics Control of Ultrasonic Transducer Array Using Two-layered Piezoelectric Transducer  

김정호 (부경대학교 음향진동공학협동과정)
송인진 (부경대학교 음향진동공학협동과정)
하강렬 (부경대학교 물리학과)
김천덕 (부경대학교 전기·제어계측공학부)
김무준 (부경대학교 물리학과)
Publication Information
The Journal of the Acoustical Society of Korea / v.22, no.8, 2003 , pp. 629-636 More about this Journal
Abstract
It will be very convenient if the directivity characteristics of ultrasonic transducer array are controllable by the purpose of use in the fields of sonar system or ultrasonic diagnostic system, In this paper, a control method of the directivity characteristics was suggested. The transducer array was consisted of two-layered piezoelectric vibrators. Efficiency of each vibrator is controlled in 2nd harmonic mode by electrical capacitance. Therefore, the beam width of the transducer array can be controlled by changing the capacitance. The directivity characteristics of the array were analyzed experimentally and theoretically. As the results, it is confirmed that -3 dB beam width of main lobe can be controlled in the range of 7.6°∼16.2°.
Keywords
Two-layered piezoelectric vibrators; Transducer array; Directivity characteristics; Beam width; Amplitude weighting; Efficiency control;
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