Journal of the Korean Society for Nondestructive Testing (비파괴검사학회지)

The Korean Society for Nondestructive Testing (한국비파괴검사학회)
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Development of Smart Active Layer Sensor (I) : Theory and Concept Study

스마트 능동 레이어 센서 개발 (I): 이론 및 개념 연구

  • Yoon, Dong-Jin (Smart Measurement Group, Korea Research Institute of Standards and Science) ;
  • Lee, Young-Sup (Smart Measurement Group, Korea Research Institute of Standards and Science) ;
  • Kwon, Jae-Hwa (Smart Measurement Group, Korea Research Institute of Standards and Science) ;
  • Lee, Sang-Il (Smart Measurement Group, Korea Research Institute of Standards and Science)
  • 윤동진 (한국표준과학연구원 스마트계측그룹) ;
  • 이영섭 (한국표준과학연구원 스마트계측그룹) ;
  • 권재화 (한국표준과학연구원 스마트계측그룹) ;
  • 이상일 (한국표준과학연구원 스마트계측그룹)
  • Published : 2004.10.30
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Abstract

This paper is the first part of the study on the development of a smart active layer (SAL) sensor, which consists of two parts. In this first part, the theory and concept of the SAL sensor is investigated, which is designed for the detection of elastic waves caused by internal cracks and damages in structures. For the development SAL sensor, (i) the basic theory of elastic waves was studied, (ii) the feasible study of the SAL as an elastic waves detection sensor using the finite element analysis (FEA) with respect to a piezoceramic disc was performed. (iii) the comparison of performances between some piezoceramic sensors and a commercial acoustic emission (AE) sensor was accomplished to ensure the applicability by the experimental means, such as a pencil lead break test. Also, the conceptional study for the SAL sensor, which can be utilized for the effective detection and locating of defects by the arrangement of regularly distributed sensors, was discussed.

본 논문은 두 편으로 구성된 스마트 능동 레이어(smart active layer, SAL) 센서 개발에 관한 첫 번째 논문으로, 구조 내에 발생하는 균열 및 손상에 의한 탄성파 검출을 위한 SAL 센서의 이론 및 개념을 연구하였다. 본 SAL 센서의 개발을 위해, 첫째, 탄성파의 기본 이론을 고찰하였고, 둘째, 이론적 토대 위에 단일 압전 disc의 유한요소해석법(finite element analysis, FEA)을 이용하여 탄성파 검출 센서로서의 가능성을 검증하였고, 셋째, 몇 종류의 압전 disc 센서와 상용 음향방출(acoustic emission, AE) 센서를 연필심 파괴시험을 통해 상호 성능을 비교하여 실험적으로 그 가능성을 확인하였다. 또한 수 개의 센서를 일정한 거리로 분포시켜서 구조물 결함의 효과적 검출 및 위치 표정이 가능한 스마트능동레이어 센서의 개념연구를 수행하였다.

Keywords

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