This technology makes it possible to monitor over large or intricate composites at multiple sensing points (2,000+) on a single optical line. The major benefit of optical fibre remains its size and its ability to replicate many traditional strain gauges without the complexity, weight or cost normally associated with electrical sensors. Manufacturers of aircraft wings or wind turbine blades for example are already familiar with this technique for identifying and pinpointing faults within materials. However, as the typical optical fibre is not much bigger than a human hair, this has also introduced some handling difficulties during the storage, preparation and application of the fibre during layup processes. To resolve these difficulties, FBGS has introduced a new strain sensing fibre with a protective GFRP jacket material, making integration with the composite material easier for the technician. Supplied on a convenient spool, it is available in either a tape (SMT-01) or wire (SMW-01) format to suit the application, be it a surface application, embedded or for monitoring civil/geo-technical structures outdoors. With dimensions of only 0,35mm and 1mm, they remain small enough to effectively transfer strain yet offer ease of handling as well as significant mechanical protection for applications in harsh environments. Whilst fibre length, number of sensors and connector type can be specified by the customer, a new fibre is now available for trials and evaluation comprising five sensors over a 6.2m length of the coated fibre. It is now possible for companies in the aerospace, yachting, civil and wind industries to introduce this measuring technique, without the issues sometimes associated with the introduction of new technologies. And if already familiar with the application of traditional electric strain gauges, then this process should be comparatively straightforward. www.fbgs.com
