Abstract
The method of a theoretical estimation of optical fiber durability used in optical fiber sensors as a sensitive element, depending on the nonstationary longitudinal strain arising at dynamic temperature changes is offered. The developed analytical model takes into account design features of a fiber (diameters of a core and cladding, a metal or polymeric covering), doping types, relative humidity of an environment, as well as the temperature dependence of the activation energy and the Young's modulus of the optical fiber, the linear expansion coefficient of the metallic coating. Numerical modeling of optical fiber service life time at dynamic influences of measured temperature and comparison with experimental data is carried out.
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