Setup for Acoustic Sensitivity Measurements of Fiber Optic Cables Based on Weak FBGs

Zhirnov, A. A.; Khan, Roman I.; Koshelev, Kirill I.; Stepanov, K. V.; Choban, T.V.; Chernutsky, Anton O.; Pnev, Alexey B.; Lopunov, A.I.; Butov, Oleg V.

doi:10.1109/iclo54117.2022.9840080

Cited by 1 publication

(1 citation statement)

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“…The Rayleigh backscatter signal generated by natural refractive index inhomogeneities in a common sensing fiber has a naturally low intensity, which results in a low signal-tonoise ratio in the output of a microphone based on a φ-OTDR. To increase the scattering level [23,24], which improves the quality of speech recognition, a fiber with wFBGs can be used [25]. The back-reflected signal power fraction arriving at the PD for a wFBG with a reflection coefficient of 0.1% is 10 −3 , while for Rayleigh scattering in a common fiber, the power fraction is 10 −6 , 3 orders of magnitude weaker.…”

Section: Principles Of the Signal-formation Process In A Distributed ...mentioning

confidence: 99%

Detection and Recognition of Voice Commands by a Distributed Acoustic Sensor Based on Phase-Sensitive OTDR in the Smart Home Concept

Gritsenko,

Orlova,

Zhirnov

et al. 2024

Sensors

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In recent years, attention to the realization of a distributed fiber-optic microphone for the detection and recognition of the human voice has increased, whereby the most popular schemes are based on φ-OTDR. Many issues related to the selection of optimal system parameters and the recognition of registered signals, however, are still unresolved. In this research, we conducted theoretical studies of these issues based on the φ-OTDR mathematical model and verified them with experiments. We designed an algorithm for fiber sensor signal processing, applied a testing kit, and designed a method for the quantitative evaluation of our obtained results. We also proposed a new setup model for lab tests of φ-OTDR single coordinate sensors, which allows for the quick variation of their parameters. As a result, it was possible to define requirements for the best quality of speech recognition; estimation using the percentage of recognized words yielded a value of 96.3%, and estimation with Levenshtein distance provided a value of 15.

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Section: Principles Of the Signal-formation Process In A Distributed ...mentioning

confidence: 99%

Detection and Recognition of Voice Commands by a Distributed Acoustic Sensor Based on Phase-Sensitive OTDR in the Smart Home Concept

Gritsenko,

Orlova,

Zhirnov

et al. 2024

Sensors

View full text Add to dashboard Cite

show abstract

Setup for Acoustic Sensitivity Measurements of Fiber Optic Cables Based on Weak FBGs

Cited by 1 publication

References 3 publications

Detection and Recognition of Voice Commands by a Distributed Acoustic Sensor Based on Phase-Sensitive OTDR in the Smart Home Concept

Detection and Recognition of Voice Commands by a Distributed Acoustic Sensor Based on Phase-Sensitive OTDR in the Smart Home Concept

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