Abstract
Distributed optical fiber sensors (DOFS) based on stimulated Brillouin scattering (SBS) are increasingly gaining popularity due to their vast practical applications. There have been a lot of Brillouin-based distributed fiber sensing methods proposed so far but they suffer from a trade-off between spatial resolution, dynamic range and measurement time. In this paper, we propose a scanning-free Brillouin optical time domain analyzer (BOTDA) based on multiple short pulse stimulated Brillouin scattering. The accumulation of acoustic phonons which are stimulated due to the passage of successive pico-second pulses along the sensing fiber causes the sub-centimeter spatial resolution and kilometer dynamic range can be achieved simultaneously in our proposed technique called multiple short pulse BOTDA (MSP-BOTDA). Moreover, since the effective Brillouin gain bandwidth of pump pulse train is more than the natural SBS bandwidth, a wider range of temperature/strain changes can be detectable by MSP-BOTDA technique compared to conventional BOTDA method.
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