전도성 필름 전극을 이용한 수중 내압용기의 누수탐지 방법에 관한 연구

Abstract

Underwater pressure vessel is generally designed and manufactured to resist the water pressure of operating depth. But on account of various unexpected errors in the process of design, manufacture and integration, the pressure vessel can be deformed and water can leak into it at the operating depth. Because there is various equipment taking the roles of control, communication, instrumentation and power source inside the pressure vessel, leakage can occur a fatal influence to the total system. So the leakage detection and notice are very important functions on the underwater pressure vessel. This paper deals with the development of water leakage detector which consists of the conductive adhesive film as a sensing electrode and the ohmmeter as a sensing instrument. To figure out and standardize the shape of water leakage, the underwater pressure vessel having the loose bolts is simulated in the tests at the case of vertical and horizontal position. To find out the effective material of electrode, through the experiment, various kinds of material (aluminum, copper and conductive fabric) as an electrodes are compared to improve sensitivity. Also, to find out the relation between electrodes gap and sensitivity, the experiment was performed and the optimal size of electrode is derived. Though these experiments, small leakage droplet up to 0.1 ㎖ can be detected by optimal design of sensor and these results will be reflected in the development of complete leakage sensing system as a future work.