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Simulation of noise within BOTDA and COTDR systems to study the impact on dynamic sensing

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Funnell, A 
Yan, J 
Soga, K 


jats:titleAbstract</jats:title> jats:pReal-time structural health monitoring requires dynamic sensing of distributed strain and temperature. Brillouin Optical Time Domain Analysis (BOTDA) and Rayleigh Coherent Optical Time Domain Reflectometry (COTDR) are promising candidates to achieve dynamic sensing. A noise model with specific parametric simulation of independent laser and detector noise sources has been developed. Although ensemble averaging significantly enhances the signal-to-noise ratio (SNR) in both systems, its time-consuming accumulation procedure prevents dynamic sensing. The sequence of averaging in the signal processing workflow varies the SNR for both systems. The system components should be optimized to reduce averaging times and achieve the required system specifications, including dynamic sensing.</jats:p>



dynamic sensing, noise simulation, BOTDA, COTDR, laser fluctuation, detection, averaging

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International Journal on Smart Sensing and Intelligent Systems

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Walter de Gruyter GmbH
Engineering and Physical Sciences Research Council (EP/I019308/1)
Engineering and Physical Sciences Research Council (EP/K000314/1)
Engineering and Physical Sciences Research Council (EP/L010917/1)
This project was carried out under the UCL-Cambridge Centre for Doctoral Training in Photonic Systems Development, with funding from EPSRC (EP/G037256/1) gratefully acknowledged. The support from the Cambridge Centre for Smart Infrastructure and Construction is also acknowledged. Special acknowledgement to Prof Aldo Minardo for his profound advice and discussion on the BOTDA model.