The article discusses the sensing characteristics embedded in optical fibre that are set to create a new trend in monitoring the health of utility network, civil infrastructure as major elements of Smart cities…
Fibre sensing technologies mentioned in this article are for Utility/Structural/Infra health monitoring that STL can leverage being in fibre business. This feature details on the sensing characteristics embedded in optical fibre that are set to become trendsetters in monitoring the health of civil infrastructure, especially for upcoming technologies like bullet trains & smart cities for utility pipelines, dams, tunnels, bridges, residential & commercial complexes. One great add-on value with such fibre is that it not only serves as sensor but also acts as a communication media to send down the signals to central command centres.
Sensing via Optical fibre technology
Sensory fibres can be classified on the basis of Light characteristics (such as intensity, wavelength, phase or polarisation; whether sensing segment is inside or outside of fibre, and local, if it is quasi or fully distributed). Optical Fibre sensors are majorly of two types: intension-metric and interfero-metric. Intension metric sensors rely on variations of the radiant power transmitted through an optical fibre to the home. For examples a micro-bend sensor is a common intension-metric sensor, while interfero-metric sensors rely on measured induced phase change in light propagating through the optical fibre such as Fabry-Perot and Bragg grating. The Smart City Project involves Sterlite’s Cat 5 cables which are suited for enhanced performance for transmission of high- speed data.
The optical fibre sensing distribution can be of two types: spatial and fully distributed sensing techniques. For spatially distributed way of monitoring use technique Fibre Bragg Gratings (FBG) and for fully distributed sensing technique Raman DTS (Distributed temperature sensor) and Brillouin Optical Time Domain Reflectometry (BOTDR) can be used even for infra more than 100 Km with the ability to measure temperature & strain at thousands of point in a single fibre. The fibre broadband is paving the way for the smart cities with successful results.