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OPTICAL WATER PENETRATION DETECTOR

IP.com Disclosure Number: IPCOM000199448D
Publication Date: 2010-Sep-04
Document File: 5 page(s) / 423K

Publishing Venue

The IP.com Prior Art Database

Abstract

The present invention discloses a method of water detection due to leakage in cable systems. Water is detected with a plastic coated optical fiber. Water that intrudes into the cables is absorbed by the plastic coating of the optical fiber and changes the optical properties of the optical fiber at the location of water penetration. The present method provides a cost effective method of water detection in long distance cable systems. The present invention is suitable to detect water intrusion in sub-sea, buried cable or aircraft cable systems.

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Page 1 of 5

    RP13490

 

OPTICAL WATER PENETRATION DETECTOR

BRIEF ABSTRACT

    The present invention discloses a method of water detection due to leakage in cable systems. Water is detected with a plastic coated optical fiber. Water that intrudes into the cables is absorbed by the plastic coating of the optical fiber and changes the optical properties of the optical fiber at the location of water penetration. The present method provides a cost effective method of water detection in long distance cable systems. The present invention is suitable to detect water intrusion in sub-sea, buried cable or aircraft cable systems.

KEYWORDS

    Water detection, Cable system, Optical Fiber, Leakage, Water intrusion, Water Penetration Location.

DETAILED DESCRIPTION

  Water and humidity penetration is one of the big challenges faced by sub-sea, aircraft and buried cable systems. Water intrusion leads to a destruction of the cable systems and can result in shut down of a power transmission line and cable system failure. An early detection of water intrusion is essential for taking countermeasures for preventing water penetration and shut down of the cable systems. Delayed and costly water detection methods deter sub-sea, aircraft and buried power cable installations.

Page 2 of 5

    RP13490

 

    Conventional water detection systems solve the problem of water penetration by an electrostatic approach. However, disadvantages of the electrostatic approach for water detection systems are a limited lifetime and long-term-stability issues. Further, some methods using the electrostatic approach are applicable only when the cable system is shut down.

   
 
Therefore there is a need in the art for an efficient and cost effective method for water and humidity penetration detection and localization method in cable systems.

    The present invention provides a special designed optical sensing fiber for water detection in cable systems. As illustrated in Figure 1, the optical sensing fiber is coated with a hydrophobe plastic. The sensing fiber is wrapped around the current conducting copper lines in a high-power cable. The optical properties of the sensing fiber change when the sensing fiber comes in contact with water or humidity thus enabling water and humidity detection.

    As illustrated in Figure 2, the...