Journal of the Korean Society for Nondestructive Testing (비파괴검사학회지)

The Korean Society for Nondestructive Testing (한국비파괴검사학회)
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Characteristics of Point-Focus Type Ultrasonic Transducer using PVDF Element

고분자(高分子) PVDF 진동자(振動子)를 이용(利用)한 점집동초음파탐촉자(点集東超音波探觸子)의 특성

  • 한응교 (한양대학교 정밀기계공학과) ;
  • 황석태 (한양대학교 정밀기계공학과 대학원) ;
  • 이범성 (한양대학교 정밀기계공학과 대학원) ;
  • 박준서 (한양대학교 정밀기계공학과 대학원) ;
  • 소창행부 (일본 일립 건설(주))
  • Published : 1992.08.25
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Abstract

In this study, we examine the characteristics of beam and the effect of these characteristics on the flaw detection by using different type of two transducers, which are PZT and PVDF film transducer. Consequently, the detection of infinitesimal flaw is more possible than PZT, since it has beam width at focus of $60%{\sim}65%$ in contrast with PZT's. Moreover we can know PVDF transducer has superiority in detecting ability for sub-surface flaw detection in view of its acoustic impedance is near to water's and its focusing range is narrower than PZT's as $65{\sim}85%$ because it has spherical surface.

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