Distributed Fiber-Optic Hot-Spot Sensors

Abstract

This paper describes recent developments in hot-spot detection using distributed fiber-optic sensing systems (DFOSS) and special sensitized polymeric coatings. The work has particular relevance to the electrical power industry for monitoring stator bars, transformers and overhead/underground high-voltage transmission lines. Two types of material are discussed which show interesting optical switching properties. The materials so far investigated are more applicable to hot-spot sensing. However, further work is required to extend the dynamic range so that temperatures may be sensed.