The combined length of the sewerage and clean water pipe infrastructure in UK is estimated to be about 800,000 km. It prone failure due its age inadequacies current inspection methods. Fibre-optic cable sensing an attractive way continuously monitor this detect critical changes. This paper reviews existing fibre-optic sensor (FOS) technologies suggest that these have better potential than tradi...

The fiber optic sensors (FOSs) are commonly used for large-scale structure monitoring systems for their small size, noise free and low electrical risk characteristics. Embedded fiber optic sensors (FOSs) lead to micro-damage in composite structures. This damage generation threshold is based on the coating material of the FOSs and their diameter. In addition, embedded FOSs are aligned parallel t...

In this work, a corrosion sensor based on an optical time domain reflectometer was presented. The first with bare tip used to measure the process of silica glass fiber. Another deposited silver layer for monitoring in nitric acid. both cases, reflectance at end fiber decreasing immersion time. Thus we can describe stage by level fresnel reflectance. maximum sensitivities analyzed sensors were a...

A novel technique is proposed for measuring the distributed strain and temperature in a fiber with a very high resolution. This technique makes use of the jagged appearance of Rayleigh backscatter traces from a single-mode fiber measured by using a coherent OTDR with a precisely frequency-controlled light source. Our preliminary experiment indicated the possibility of measuring temperature with...