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Long-range high-spatial-resolution distributed Brillouin sensing enabled by correlation-domain encoding
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DOI：10.1364/OL.485004.png)
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Abstract
En 中文
A hybrid aperiodic-coded Brillouin optical correlation domain analysis (HA-coded BOCDA) fiber sensor is pro-posed to achieve long-range high-spatial-resolution distrib-uted measurement. It is found that high-speed phase modu-lation in the BOCDA actually forms a special energy trans-formation mode. This mode can be exploited to suppress all detrimental effects parasitized in a pulse coding-induced cascaded stimulated Brillouin scattering (SBS) process and thereby enable the HA-coding to reach its full potential to improve the BOCDA performance. As a result, under a low system complexity and an enhanced measurement speed, a 72.65-km sensing range and a 5-cm spatial resolution are achieved with a temperature/strain measurement accuracy of 2celcius/40 & mu;& epsilon;. & COPY; 2023 Optica Publishing Group
Keywords:
DPP-BOTDA