Study of Sensitivity Distribution Along the Contour of a Fiber-Optic Sensor Based on a Sagnac Interferometer

Gritsenko, T. V.; Dyakova, N. V.; Zhirnov, A. A.; Stepanov, K. V.; Khan, R. I.; Koshelev, K. I.; Pnev, A. B.; Karasik, V. E.

doi:10.1134/s002044122305010x

Cited by 3 publications

(1 citation statement)

References 22 publications

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“…The interference leads to maxima and minima in the intensity changes in time, which is the interference pattern. The sensitivity of the system is greater in intensity peaks and minimal in low-intensity zones [20]. Further, random multibeam interference causes nonlinearity of the transfer function of the system, which differs from the two-beam interference simple sinewave, which is observed, e.g., when two waves are reflected from a pair of wFBGs.…”

Section: Mathematical Model Of the Signal-formation Process In A Dist...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: Mathematical Model Of the Signal-formation Process In A Dist...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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Manufacture of Microstructured Optical Fibers: Problem of Optimal Control of Silica Capillary Drawing Process

Vladimirova,

Pervadchuk,

Konstantinov

2024

Computation

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The effective control of any technological process is essential in ensuring high-quality finished products. This is particularly true in manufacturing knowledge-intensive and high-tech products, including microstructured photonic crystal fibers (PCF). This paper addresses the issues of stabilizing the optimal control of the silica capillary drawing process. The silica capillaries are the main components of PCF. A modified mathematical model proposed by the authors is used as the basic model of capillary drawing. The uniqueness of this model is that it takes into account the main forces acting during drawing (gravity, inertia, viscosity, surface tension, pressure inside the drawn capillary), as well as all types of heat transfer (heat conduction, convection, radiation). In the first stage, the system of partial differential equations describing heat and mass transfer was linearized. Then, the problem of the optimal control of the drawing process was formulated, and optimization systems for the isothermal and non-isothermal cases were obtained. In the isothermal case, optimal adjustments of the drawing speed were obtained for different objective functionals. Thus, the proposed approach allows for the constant monitoring and adjustment of the observed state parameters (for example, the outer radius of the capillary). This is possible due to the optimal control of the drawing speed to obtain high-quality preforms. The ability to control and promptly eliminate geometric defects in the capillary was confirmed by the analysis of the numerical calculations, according to which even 15% deviations in the outer radius of the capillary during the drawing process can be reduced to 4–5% by controlling only the capillary drawing speed.

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A Study on Sensitivity Improvement of the Fiber Optic Acoustic Sensing System Based on Sagnac Interference

Tang,

Zhao,

Feng

et al. 2024

Sensors

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A new pickup structure was introduced and modified to improve the resolution of the linear Sagnac optical fiber acoustic sensing system. The maximum strains corresponding to the material, diameter, wall thickness, and height of the pickups were analyzed by simulation. An aluminum cylinder with a diameter of 110 mm, a wall thickness of 3 mm, and a height of 120 mm was chosen as the basic pickup. A four-groove pickup with a vertical width of 80 mm and a horizontal width of 20 mm was introduced to improve the sensitivity of the system. The experiments showed that the average peak-to-peak sensitivity of the four-groove pickup increased by 215.54% to 106.806 mV/Pa. The improved pickup can be applied in areas to monitor the situation of invasion of the Sagnac optical fiber acoustic sensing system.

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Study of Sensitivity Distribution Along the Contour of a Fiber-Optic Sensor Based on a Sagnac Interferometer

Cited by 3 publications

References 22 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

Manufacture of Microstructured Optical Fibers: Problem of Optimal Control of Silica Capillary Drawing Process

A Study on Sensitivity Improvement of the Fiber Optic Acoustic Sensing System Based on Sagnac Interference

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