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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

Abstract

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.

Keywords

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

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