Abstract

A method to extend the operation of traditional single-frequency phase-sensitive optical time-domain reflectometry (Phi OTDR) to the monitoring of distributed temperature gradients along an optical fiber is proposed and experimentally validated. The measurement principle is derived from the perturbation response of a single-wavelength Phi OTDR signal, which is analyzed as a unidimensional speckle pattern. The method could be implemented in parallel to standard Phi OTDR systems used for distributed vibration sensing with a close to zero cost and without affecting its operation, as it only requires a low computational cost post-processing of the traces which are already acquired. Frequency scanning of the laser, heterodyning or additional hardware are not required. The distributed detection of a temperature gradient of 2.5 degrees C over 10 min is demonstrated.