대한전자공학회논문지 (Journal of the Korean Institute of Telematics and Electronics)

대한전자공학회 (The Institute of Electronics and Information Engineers)
권호 표지

압전형 초음파 Transducer의 내부 손실이 그 성능에 미치는 영향

The Effects of the Internal Losses of a Piezoelectric Ultrasonic Transducer on Its Performances

  • 이종현 (한국과학기술원 기계공학과) ;
  • 이병호 (한국과학기술원 기계공학과) ;
  • 박송배 (한국과학기술원 전자공학과)
  • Ih, Jong Hyun (Dept. of Mechanical Eng., KAIST) ;
  • Lee, Byung Ho (Dept. of Mechanical Eng., KAIST) ;
  • Park, Song Bai (Dept. of Elec. Eng., KAIST)
  • 발행 : 1986.04.01
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

Performances of a piezoelectric ultrasonic transducer are analyzed considering the internal losses of a piezoleelctric material and fabricated layers. The KLM-model is adopted for the equivalent circuit of a piezoelectric resonator, and the attenuation coefficient is introduced to represent the internal losses of the transducer. The attenuation coefficient of a piezoelectric resonator is inversely proportional to the maximum value of the input electrical resistance, and is confirmed to be an efficient parameter for the analysis of the considerable lossy piezo-electric resonator operating in a thickness mode. Also, the experimentla RTII is obtained by pulse-echo method. The experimental result is deviated from the predicted one within 3 dB over the 20dB frequency bandwidth.

키워드