Curvature monitoring of power grid wires based on anti-resonant reflecting guidance in hollow core fibers

Abstract

The curvature condition of power cables is monitored by a fiber sensor based on anti-resonant reflecting guidance mechanism in hollow core optical fibers. The sensor head is simple, which only consists of a section of hollow core fiber fusion spliced between single mode fibers. Multiple transmission dips are observed in the transmission spectrum, which arise from the anti-resonant reflecting effect in the silica ring cladding. The curvature of a power wire can be detected by attaching the fiber sensor to the cable. The transmitted intensity at resonant wavelengths rises as curvature applied on the power cable increases, and a sensitivity of 3.414 dB/m-1 is achieved. The temperature response of the sensor is also investigated, and the results indicate that such a sensor has low temperature cross-sensitivity of 0.002 m−1/oC.