| Authors |
Polyakova Ekaterina Alekseevna, head of department of reliability, Research Institute of physical measurements (8/10 Volodarskogo street, Penza, Russia), E-mail: yek.polyakova2016@yandex.ru
Badeeva Elena Aleksandrovna, doctor of technical sciences, professor, sub-department of accounting, taxation and auditing, Penza State University (40 Krasnaya street, Penza, Russia), E-mail: badeeva_elena@mail.ru
Murashkina Tatyana Ivanovna, doctor of technical sciences, professor, sub-department of instrument making, Penza State University (40 Krasnaya street, Penza, Russia), E-mail: timurashkina@mail.ru
Badeev Alexander Valentinovich, candidate of technical sciences, senior specialist, Center for information and analytical support of social and hygienic monitoring systems in Penza (30 Kuybysheva street, Penza, Russia), E-mail: badeyev@mail.ru
Slavkin Ilya Evgenevich, postgraduate student, Penza State University (40 Krasnaya street, Penza, Russia), E-mail: ilya-slavkin@yandex.ru
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| Abstract |
Subject and goals. The main elements of fiber-optic measuring converters are optical fibers, the bending radius of which significantly affects the metrological and operational characteristics. Therefore, it is necessary to determine the conditions under which this influence will not lead to a deterioration in the technical characteristics of fiber-optic measuring transducers. Purpose of work – the improvement of the technical characteristics of fiber-optic transducers, defined by the mechanical reliability of optical fiber determined from changes in the bending radius of optical fibers and reduce the mechanical reliability of optical fiber. The subject of the research is the physical effects that occur in the optical fiber material during its uninformative bends during the manufacture and operation of fiber-optic measuring transducers.
Methods. The maximum values of the radii of micro – and macrobends of the optical fiber are determined, which reduce the intensity of the light flux, metrological and operational reliability of the optical fiber. The research uses methods of geometric optics, logarithmic differentiation, and the ratio for the effect of photoelasticity during optical fiber deformation.
Results and conclusions. The dependence of the intensity of the light flux on the change in the bending radius of the optical fiber is established. The relations for calculating the loss coefficients due to bends of small and large radius and calculating the boundary conditions for maintaining the operability of a fiber-optic cable are presented. The reasons for reducing the reliability of fiber-optic cable during operation as part of a fiber-optic converter are determined. When considering the processes occurring in optical fibers at the moment of their bending, it is necessary to take into account the effect of photoelasticity and changes in the refractive coefficients of optical fiber layers. The paper defines the boundary conditions for the criticality of optical fiber bends, which reduce their mechanical and metrological reliability. By controlling the bending radius of the fiber, you can not only control the intensity of the transmitted light signal in the measurement zone of the fiber-optical Converter, but also improve the reliability and performance of the measuring tool.
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| Key words |
fiber-optic measuring converter, optical fiber, light intensity, bending radius, reliability, mechanical strength, photoelasticity, refractive index
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