Distributed Fibre Optic Sensor System for Temperature and Strain Monitoring Based on Brillouin Optical-Fibre Frequency-Domain Analysis

We report on the development of a distributed fibre optic monitoring system for detection of strain and temperature along single-mode fibres. The system is based on the Brillouin optical-fibre frequency-domain analysis (BOFDA). In order to bring down costs of the measuring device, the sideband technique has been implemented for the BOFDA analysis. The use of only one low-cost DFB laser has eliminated the effects of any frequency drift and therefore no tunable laser source has been demanded. We present a BOFDA setup offers digital filtering for enhancement of the dynamic range [1].