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2016 Vol.35, Issue 3 Preview Page
Fabrication of a PMN-PZT needle hydrophone for photoacoustic imaging

광음향 영상화를 위한 PMN-PZT 바늘형 수중청음기 제작

Xiaofeng Fan1
,
Yonggang Cao2
,
Kanglyeol Ha3*
,
Moojoon Kim3
,
Hyun Wook Kang1
,
Junghwan Oh1
Fan Xiaofeng1
,
Cao Yonggang2
,
하 강렬3*
,
김 무준3
,
강 현욱1
,
오 정환1
1부경대학교 의공학과,
2College of Sciences, China Jiliang University
3부경대학교 물리학과
한국해양과학기술원 부설 선박해양플랜트연구소
*교신저자. *Corresponding Author. 
31 May 2016. pp. 175-182
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Abstract

For application to several MHz photoacoustic imaging systems, a needle hydrophone was designed and fabricated by using PMN-PZT piezoelectric single crystal, and its characteristics were evaluated through comparison with a commercial PVDF(Polybinylidene Fluoride) hydrophone of which receiving sensitivity is known. The simulation using the KLM model results show that the peak receiving impulse response for 50 Ω terminating impedance of the fabricated hydrophone is -261.6 dB re 1V/μPa and the frequency response is relatively flat over 2 ~ 12 MHz with fluctuation less than 5 dB. The measurement results using tone burst signals also show that it has higher (ave. 10.9 dB) sensitivity than the commercial hydrophone in 2 ~ 8 MHz, and the receiving sensitivity of -255.8±2.8 dB re 1V/μPa was measured for the fabricated hydrophone. In addition, it is known that the photoacoustic signals and the image of a hair obtained by a mechanical scanned photoacoustic imaging system with the fabricated hydrophone were bigger and better than those obtained with the commercial hydrophone.

Keywords
Photoacoustic effect
Ultrasonic transducer
Piezoelectric crystal PMN-PZT, PVDF (Polyvinylidene Fluoride) piezoelectric film
Ultrasound image

수 MHz의 초음파를 이용하는 저주파 광음향 영상장치에 적용하는 것을 목적으로 압전단결정 PMN-PZT를 사용한 바늘형 수중청음기를 설계 제작하고, 그 특성을 수신감도가 알려져 있는 상용 PVDF(Polyvinylidene Fluoride) 수중청음기와 비교하여 평가하였다. 설계한 수중청음기의 임펄스응답을 KLM 모델에 의해 시뮬레이션한 결과, 50 Ω의 종단 임피던스에 걸리는 최대 전압을 기준으로 한 수신감도는 -261.6 dB re 1V/μPa이며, 2 ~ 12 MHz 대역에서 5 dB 이내의 비교적 평탄한 특성을 가지는 것으로 예측되었다. 제작한 수중청음기의 수신감도를 순음 펄스를 사용하여 측정한 결과, 측정 가능한 2 ~ 8 MHz 대역에서 상용의 수중청음기에 비해 평균 10.9 dB 높게 나타났으며, 그 값은 -255.8±2.8 dB re 1V/μPa이었다. 나아가, 제작한 수중청음기를 기계주사형 광음향 영상장치에 적용하여 머리카락에 대한 영상을 획득하였는바, 수신된 광음향 신호가 상용의 것보다 크고, 영상 또한 우수함을 알았다.

키워드
광음향 효과
초음파 트랜스듀서
압전단결정 PMN-PZT
PVDF 압전막
초음파 영상
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Information
  • Publisher :The Acoustical Society of Korea
  • Publisher(Ko) :한국음향학회
  • Journal Title :The Journal of the Acoustical Society of Korea
  • Journal Title(Ko) :한국음향학회지
  • Volume : 35
  • No :3
  • Pages :175-182
  • Received Date : 2016-02-05
  • Revised Date : 2016-03-02
  • Accepted Date : 2016-04-16
  • DOI :https://doi.org/10.7776/ASK.2016.35.3.175
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