Journal of the Korean Society for Nondestructive Testing (비파괴검사학회지)

The Korean Society for Nondestructive Testing (한국비파괴검사학회)
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A Study on Detection of Elastic Wave Using Patch Type Piezo-Polymer Sensor

부착형 고분자 압전센서를 이용한 탄성파 검출 연구

  • Kim, Ki-Bok (Center for Environment & Safety, Korea Research Institute of Standards and Science) ;
  • Yoon, Dong-Jin (Center for Environment & Safety, Korea Research Institute of Standards and Science) ;
  • Kueon, Jae-Hwa (Center for Environment & Safety, Korea Research Institute of Standards and Science) ;
  • Lee, Young-Seop (Center for Environment & Safety, Korea Research Institute of Standards and Science)
  • 김기복 (한국표준과학연구원 환경안전계측센터) ;
  • 윤동진 (한국표준과학연구원 환경안전계측센터) ;
  • 권재화 (한국표준과학연구원 환경안전계측센터) ;
  • 이영섭 (한국표준과학연구원 환경안전계측센터)
  • Published : 2004.06.30
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Abstract

Patch type piezo-polymer sensors for smart structures were experimented to detect elastic wave. The pencil lead braking test was performed to analyze the characteristics of patch-type piezo-polymer sensors such as polyvinyliden fluoride (PVDF) and polyvinylidene fluoride trifluorethylene (P(VDF-TrFE)) for several test specimens with various elastic wave velocities and acoustical impedances. The characteristics of the patch-type piezo-polymer sensor were compared with the commercial PZT acoustic emission (AE) sensor. The vacuum grease and epoxy resin were used as a couplant for the acoustic impedance matching between the sensor and specimen. The peak amplitude of elastic wave increased as the diameter of piezo-film and acoustical impedance of the specimen increased. The frequency detection range of the piezo-film sensors decreased with increasing diameter of the piezo-film sensor. The P(VDF-TrFE) sensor was more sensitive than the PVDF sensor.

스마트 구조물에 적합한 탄성파 검출 센서로서 고분자 압전센서를 이용한 부착형 센서에 대한 연구를 수행하였다. PVDF와 P(VDF-TrFE)에 대하여 센서로서의 특성을 평가하였으며 상용화된 PZT 센서와 비교하였다. 음향임피던스가 서로 다른 여러 가지 재료에 고분자 압전센서를 부착하여 연필심 파괴 시 발생하는 탄성파를 검출하여 분석하였다. 센서의 직경이 증가함에 따라 검출 신호의 최대 진폭 값은 증가하였으나 센서의 주파수 검출한계는 감소하는 것으로 나타났다. 시편의 음향임피던스가 감소할수록 검출신호의 최대 진폭 값은 증가하였으며 주로 저주파수의 주파수 성분의 신호에 민감한 것으로 분석되었다. 전반적으로 P(VDF-TrFE) 센서가 PVDF 센서보다 감도 면에서 다소 양호한 것으로 나타났다.

Keywords

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