New $\phi$-OTDR system enhances acoustic sensing with Sagnac interferometer

Researchers have developed a new Sagnac-assisted enhanced phase-sensitive optical time-domain reflectometry ($\phi$-OTDR) system to improve distributed acoustic sensing (DAS). This architecture addresses performance degradation issues like polarization-induced fading and environmental interference by using a Sagnac interferometer to supplement $\phi$-OTDR data. A standardized benchmark framework was also created to evaluate different event recognition models, with a dual-branch fusion model achieving 89.79% accuracy on a 10-km fiber with six acoustic event classes. AI

IMPACT Introduces a novel sensing architecture and benchmark for acoustic event recognition, potentially improving performance in distributed sensing applications.

RANK_REASON This is a research paper detailing a new technical framework and evaluation of a specific sensing technology. [lever_c_demoted from research: ic=1 ai=0.4]

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• dual-branch fusion model
• Sagnac-assisted enhanced $\phi$-OTDR

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