ABSTRACT

Subsea cables protection afforded by burying a cable [beneath the sea bed] also means that the available methods for their survey are drastically reduced. From the existing methods only electromagnetics (EM) detection can penetrate the sea bed and provide an effective means for cable localisation. However, EM waves attenuate faster in conductive media such as sea water. EM localisation is considered a short range detection mechanism requiring the use of autonomous or remotely operated underwater platforms. In this paper, the authors investigate the range of EM detection and test detection distances exceeding one hundred metres. The EM signal was detected at distances around 140 m in sea water during the trials conducted in a ‘real’ environment at Hooe Lake in Plymouth.

摘要

通过将电缆埋在[海床下]提供的海底电缆保护也意味着可用于他们的调查的方法大大减少。从现有方法来看，只有电磁 (EM) 检测可以穿透海床并为电缆定位提供有效手段。然而，电磁波在海水等导电介质中衰减得更快。EM 定位被认为是一种短程检测机制，需要使用自主或远程操作的水下平台。在本文中，作者研究了超过一百米的电磁探测范围和测试探测距离。在普利茅斯胡伊湖的“真实”环境中进行的试验期间，在海水中大约 140 m 的距离处检测到 EM 信号。