Influence of the optical fiber deformations for a recirculation period in the optoelectronic perimeter security systems

  • Dmitrii G. Sakhonchik Belarusian State University, 4 Niezaliežnasci Avenue, Minsk 220030, Belarus
  • Alexander V. Polyakov Belarusian State University, 4 Niezaliežnasci Avenue, Minsk 220030, Belarus
DOI: https://doi.org/10.33581/2520-2243-2019-2-112-124

Abstract

The operation algorithm of the underground recirculation fiber optic system for perimeter protection using WDM-technology of spectral separation of information channels is described. The experimental results of the transverse deformation magnitude of an optical fiber depending on the hardness of the polyurethane foam elastic base, the number of deformation points and the mass of the walking or crawling intruder are presented. A mathematical model of changing time intervals between circulating pulses depending on the magnitude of optical fiber deformations has been developed. This model allows to calculate the value of additional losses depending on the bend radius, bend angle, probability of tunneling radiation from the core into the cladding, parameters of the quartz fiber itself, as well as on the hardness of the elastic base of the sensing element and the number of deformation points. It is shown that in the case of a constant radius of the deforming element R = 4 mm and a single-mode stepped optical fiber for a running intruder, additional time delays of the recirculation period occur 1.1–1.7 ns, for a crawling intruder, this value is within 0.3– 0.9 ns.

Author Biographies

Dmitrii G. Sakhonchik, Belarusian State University, 4 Niezaliežnasci Avenue, Minsk 220030, Belarus

student at the faculty of radiophysics and computer technologies

Alexander V. Polyakov, Belarusian State University, 4 Niezaliežnasci Avenue, Minsk 220030, Belarus

PhD (physics and mathematics), docent; associate professor at the department of physics and aerospace technologies, faculty of radiophysics and computer technologies

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Published
2019-05-24
Keywords: fiber optic system, perimeter security, recirculation period, deformation, optical fiber loss, time delays
How to Cite
Sakhonchik, D. G., & Polyakov, A. V. (2019). Influence of the optical fiber deformations for a recirculation period in the optoelectronic perimeter security systems. Journal of the Belarusian State University. Physics, 2, 112-124. https://doi.org/10.33581/2520-2243-2019-2-112-124
Issue
No 2 (2019): Journal of the Belarusian State University. Physics
Section
Fiber Optics

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