PVDF 압전초음파 트랜스듀서의 펄스응답특성

이덕출; 박강식

Polymer(Korea), Vol.16, No.6, 631-637, November, 1992

Export Citation

PVDF 압전초음파 트랜스듀서의 펄스응답특성

The Pulse Response Properties of Piezoelectric Ultrasonic Transducer

이덕출, 박강식

초록

고분자 압전재료인 PVDF 필름을 이용하여 초음파용 압전변환기를 제작하였다. 압전변환기에 펄스입력을 가하였을 때 1∼2주기의 응답펄스가 나타났으며 그 응답파형은 세라믹 압전변환기에 비하여 훨씬 빠르게 감쇠가 일어남을 확인할 수 있었다. 이와 같이 감쇠가 빨리 일어나는 응답특성은 고주파용 의용 초음파 영상장치에 사용될 경우 해상도의 증진에 기여할 것으로 생각된다. 또한 변환자의 전극 크기에 따라 공진 주파수가 달라짐을 확인 할 수 있었으며 이와 같은 사실로부터 Low MHz 대에서의 공진은 radial mode 임을 알 수 있었다.

Piezoelectric transducers for ultrasonic sensors were fabricated with piezoelectric PVDF film. When electric impulse waves were applied to the piezoelectric PVDF transducers, transducers produced a single or double pulses with a rapid ringdown and the ringdown time of PVDF transducer was shorter than that of ceramic transducers. These response properties are expected to contribute to the improvement of the resolution of medical ultrasonic imaging system. Resonance frequency of PVDF transducer changed with the electrode size of the transducers. From the result, the resonance of PVDF transducer in low MHz frequency is radial mode.

[References]

Ting RY, Ferroelelctrics, 67, 143 (1986)
Newnham RE, Safari A, Sa-gong G, Giniewiez J, Ultrasonics Symposium, 501 (1984)
Wells PNT, "Biomedical Ultrasonics," pp. 145-282, Academic Press Inc., London, 82 (1977)
Kino GS, "Acoustic Waves: Devices, Imaging, and Analogy Signal Processing," pp. 27-83, Prentice-Hall, Inc., New Jersey (1987)
Kimura K, Hashimoto N, Ohigashi H, IEEE Trans. Sonic Ultrasonics, SU32(4), 566 (1985)
Bui LN, Shaw HJ, Zitelli LT, IEEE Trans. Sonic Ultrasonics, SU24(5), 331 (1977)
Persson HW, Herzt CH, Ultrasonics, 83 (1985)
Goll JH, IEEE Trans. Sonic Ultrasonics, SU24(6), 385 (1978)
Sessler GM, J. Acoustic Soc. Am., 70(6), 1596 (1981)
Mort J, "Electronic Properties of Polymers," pp. 111-150, John Wiley and Sons Inc., New York (1982)

[Referenced By]

[1] Ting RY, Ferroelelctrics, 67, 143 (1986)

[2] Newnham RE, Safari A, Sa-gong G, Giniewiez J, Ultrasonics Symposium, 501 (1984)

[3] Wells PNT, "Biomedical Ultrasonics," pp. 145-282, Academic Press Inc., London, 82 (1977)

[4] Kino GS, "Acoustic Waves: Devices, Imaging, and Analogy Signal Processing," pp. 27-83, Prentice-Hall, Inc., New Jersey (1987)

[5] Kimura K, Hashimoto N, Ohigashi H, IEEE Trans. Sonic Ultrasonics, SU32(4), 566 (1985)

[6] Bui LN, Shaw HJ, Zitelli LT, IEEE Trans. Sonic Ultrasonics, SU24(5), 331 (1977)

[7] Persson HW, Herzt CH, Ultrasonics, 83 (1985)

[8] Goll JH, IEEE Trans. Sonic Ultrasonics, SU24(6), 385 (1978)

[9] Sessler GM, J. Acoustic Soc. Am., 70(6), 1596 (1981)

[10] Mort J, "Electronic Properties of Polymers," pp. 111-150, John Wiley and Sons Inc., New York (1982)