10.14489/td.2023.12.pp.013-023

2023, 12 December

DOI: 10.14489/td.2023.12.pp.013-023

Fedotov M. Yu., Vasiliev S. A.
METHODICAL ASPECTS OF EVALUATING THE SENSITIVITY OF FIBER BRAGG GRATINGS TO MECHANICAL AND THERMAL EFFECTS FOR OPTICAL TESTING SYSTEMS OF POLYMER COMPOSITES
(pp. 13-23)

Abstract. The physical principles of optical non-destructive testing using fiber-optic sensors based on fiber Bragg gratings are considered using two experimental methods. For free fiber Bragg gratings recorded in optical fiber, two new experimental techniques have been developed to determine the linear and nonlinear strain and temperature sensitivity coefficients, as well as the cross sensitivity coefficient, which must also be taken into account when using a quadratic optical control model. Using the developed methods, which take into account the quadratic model of the optical non-destructive testing of polymer composite materials, experimental researches were carried out on the optical non-destructive testing of carbon composite samples during tests for static tension and temperature effects. Based on the results of experimental researches, correlation dependences of the relative change in the resonant wavelength of the fiber Bragg grating in the composition of the carbon composite on deformation and temperature were obtained, and the cross-sensitivity coefficient was estimated. It has been experimentally shown that the proposed approach can be adapted and widely applied to create integrated fiber-optic systems for optical non-destructive testing of structures during bench tests and real operating conditions.

Keywords: optical non-destructive testing, carbon composite, experimental method, fiber optic sensor, fiber Bragg grating, sensitivity coefficient, strain, temperature.

+ - About the Authors Click to collapse

M. Yu. Fedotov (Institute of Automation and Electrometry of the Siberian Branch of the Russian Academy of Sciences (IA&E SB RAS), Novosibirsk, Russia, Russian Academy of Engineering (RAE), Moscow, Russia) E-mail: Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра.
S. A. Vasiliev (Prokhorov General Physics Institute of the Russian Academy of Sciences, Dianov Fiber Optics Research Center, Moscow, Russia) E-mail: Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра.

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