A novel temperature-strain decoupling method for distributed fiber sensing system based on backscattered light

摘要

A novel decoupling method is proposed to tackle the temperature-strain decoupling issue conveniently and economically for distributed fiber temperature and strain sensing systems (DTSS). Because Rayleigh backscattered light is not sensitive to either temperature or strain, a faction of it is taken as a reference light to eliminate the influence from emitting light caused instability and to ameliorate interference factors such as light path's disturbance in the system. On the other hand, using a RF frequency filter, we were able to distinguish factors from Brillouin backscattered light intensity or its frequency shift on the heterodyne signal. In this paper, the working principles and related experiment results are presented. After calibration, the length of the sensing fiber is 13 km and the spatial resolution is 7 m. Other parameters are anticipated as temperature resolution 1°C, and strain resolution 20 εμ in this system.? (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.