Using Multiple Reference Points in Raman Based Distributed Temperature Sensor for Eliminating DC Interference

In this paper, the multiple reference points methods for eliminating dc interference in Raman scattering based distributed temperature sensors (DTSs) are presented and their performance comparison for eliminating dc interference is also made under two different test conditions. The experimental results show that the dual reference points temperature interrogating methods can calculate dc offsets in real time and improve the performance of DTS systems efficiently under mutative dc offsets condition. Meanwhile, more than two reference points cannot improve the system in performance, and the single reference point method is suitable for working under constant dc offsets condition.