Peak-tracking BOTDA with dynamic ternary search

Abstract

We propose a peak-tracking BOTDA (PT-BOTDA) equipped with an efficient dynamic Brillouin frequency shift (BFS) searching scheme based on ternary search. The proposed scheme establishes a feedback loop between the selected frequency and the corresponding Brillouin gain to reduce the required number of scanning frequencies in one measurement. We also demonstrate the performance evaluation of the proposed scheme under scenarios with different searching granularities and dynamic sensing ranges. Experimental results indicate that in all situations, the proposed PT-BOTDA can achieve at least 85% and 97% reduction in the number of scanning frequencies for 1-MHz and 0.1-MHz frequency steps, respectively, with a 3-meter spatial resolution, while maintaining a convincing BFS searching accuracy under sufficient SNR condition using a smaller searching interval.

Performance Enhancement in a Few-Mode Rayleigh-Brillouin Optical Time Domain Analysis System Using Pulse Coding and LMD Algorithm

“…Brillouin optical time domain analysis (BOTDA) can be used to measure parameters such as temperature, strain, and vibration, and it is capable of continuous monitoring over long distances, with high spatial resolution and measurement accuracy [1][2][3][4]. It has broad application prospects in areas such as electric power, petroleum, aviation, and health monitoring of large structures [5,6]. BOTDA sensing technology includes two main structures: double-ended and single-ended.…”