Simultaneous temperature and strain sensing using distributed Raman optical time-domain reflectometry

摘要

A novel method of simultaneous distributed temperature and strain sensing in optical fibers is proposed. The method is based on the dependence of spontaneous Raman scattering intensity on the applied stress. A simple Raman reflectometry arrangement similar to distributed temperature sensors is used. 30 mu strain and 0.02 K root mean square errors of the simultaneously measured strain and temperature, respectively, are demonstrated for a spatial resolution of 2 m. Realization through this method is simple and can compete with the one based on Brillouin scattering for some applications.