압전 횡효과를 이용한 무지향성 주파스가변 초음파트랜스듀서
Frequency Controllable Wide-Beam Ultrasonic Transducer with Transverse Mode
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Abstract
In order to obtain wide-beam characteristics and variable resonant frequency of a ultrasonic transducer for the array source, an electrode of transverse mode piezoelectric vibrator is divided, and an electronic inductance is connected to the divided electrodes. The electronic inductance is made by GIC(General Impedance Converter) circuit. Because the GIC circuit is made of OP-Amps and other passive elements, the value of the inductance can be selected easily. As the results, the electronic inductance is variable in the range from 0.2mH to 1.2mH. Using the inductance, the resonance frequency of the transducer can be changed in the range from 73kHz to 86kHz. In the directivity of the transducer, it is confirmed that the beam width of the transducer is wider than 80° at -3dB in water.
참고문헌 (7)
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