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김정환(Jung Whan Kim),김무준(Moo Joon Kim),하강열(Kang Lyeol Ha) 한국센서학회 1999 센서학회지 Vol.8 No.1
When a moving piezoelectric transducer detects an object in water, its receiving sensitivity is attenuated by Doppler effect. In this paper, a method for compensating the effect is suggested by using a newly designed condenser of which capacitance is varied according to the moving speed of the transducer. Using the method, the receiving resonant frequency of the transducer can be changed automatically. As a result, there is good agreement between the results of experiment and those of calculation. It is confirmed that the response sensitivity degradation of transducers due to Doppler effect can be compensated in the range of 1∼10m/s moving speed.