Development of Leak Detection System of Heat Exchanger using Acoustic Emission Technique

음향방출기법을 이용한 열교환기 누설검출시스템 개발

  • Lee, Min-Rae (Graduate School of Busan National University) ;
  • Lee, Jun-Hyeon (Dept.of Mechanical Engineering, Busan National University)
  • Published : 2002.05.01


Acoustic emission(AE) technique has been applied to not only mechanical property testing but also on-line monitoring of the entire structure or a limit zone only. Although several AE devices have already been developed for on-line monitoring, the price of these systems is very high and it is difficult for the field to apply yet. In this study, we developed a specially designed PC-based leak detection system using A/D board. In this paper, AE technique has been applied to detect leak for heat exchanger by analyzing the characteristics of signal obtained from leak. It was confirmed that the characteristics of the signal generated by the turbulence of gas in the heat exchanger is narrow band signal having between 130-250kHz. Generally, the amplitude of leak signal is increased as the leak size increasing, but showed no significant change at frequency characteristic. Leak source location can be found by determining for the paint of highest signal amplitude by comparing with several fixed sensors. In this paper, AE results are compared with the PC-based leak detection system using A/D board.


Heat Exchanger;Leak Detection;Acoustic Emission;Leak Source Location;PC-Based Leak Detection System


  1. 정희돈, 1994, '음향방출기법의 공학적 이용을 위한 기초,' 대한기계학회지 제 34권 제 1호, pp. 20-28
  2. Rajtar, J.M. and Muthiah, R., 1997, 'Pipeline Leak Detection System for Oil and Gas Flowlines,' J. of Manufacturing Science and Engineering, Vol. 119, pp. 105-109
  3. Pollock, A.A. and Hsu, S.Y., 1982, 'Leak Detection Using Acoustic Emission,' J. of Acoustic Emission, Vol. 1, No. 4, pp. 237-240
  4. Nondestructive Testing Handbook Vol. 5, 1991, 'Acoustic Emission Testing,' pp. 12-19, American Society for Nondestructive Testing
  5. John Reason, 1987, 'Acoustic Leak Detection Provides Early Waring of Piping Failure,' in Power pp. 372-373
  6. Lord, A.E., Jr., Densher, J.N. and Koerner, R.M., 1976, 'Attenuati on of Elastic Waves in Pipelines as Applied to Acoustic Emission Leak Detection,' J. of Materials Evaluation, pp. 49-60
  7. 이진경, 이준현, 이민래, 최홍섭, 2000, 'Cocure/Precure 경화공정에 의해 제조된 Carbon/Epoxy 복합재료의 미시적 파손거동에 대한 AE특성,' 대한기계학회 논문집 A권, Vol. 24, No. 10, pp. 2520-2528
  8. 이진경, 송상헌, 이준현, 2001, '알루미나 세라믹에 대한 열충격 손상의 비파괴적 평가,' 대한기계학회 논문집 A권, Vol. 25, No. 8, pp. 1189-1196
  9. 이민래, 이준현, 1999, '배관의 누설탐지를 위한 음향방출기법 적용에 관한 연구,' 대한기계학회 추계학술대회 논문집 A권, pp. 284-289
  10. 이준현, 이민래, 손명환, 권영길, 2000, '음향방출기법을 이용한 극저온 환경하에서 초전도 계자코일의 ?칭탐지 적용에 관한 연구,' 대한기계학회 논문집 A권, Vol. 24, No. 4, pp. 858-865