SENSING RANGE EXTENSION OF A SELF-SWEEPING LASER-BASED BOTDA USING SPATIAL AVERAGING WITH ALIGNMENT
A.I. Krivosheev1, F.L. Barkov1, Y.A. Konstantinov1, N.R. Poddubrovskii2, I.A. Lobach2
1Institute of Continuous Media Mechanics, Ural Branch, Russian Academy of Sciences, Perm, Russia
2Institute of Automation and Electrometry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
Keywords: BOTDA, self-sweeping laser, correlation-based method, distributed sensor
Abstract
This paper presents a Brillouin optical time-domain analysis (BOTDA) system based on a self-sweeping laser. The system interrogates a 50 km optical fiber with a frequency error of 1.5 MHz within a 30-second measurement time. Furthermore, it is demonstrated that the sensing range can be extended to 88 km and 96 km using standard and correlation-based signal processing methods, respectively.
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