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	A fiber optic vibration sensor based on SMF-MMF-SMF structure and a tilted fiber Bragg grating</div>

Andrey A. Dmitriev , Kirill V. Grebnev, Varzhel  Sergey  V., Plotnikov Mikhail Yurievich

2021 , VOLUME 21, NUMBER 6 ( november-december )

ISSN 2226-1494 (print), ISSN 2500-0373 (online)

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Nikiforov
Vladimir O.
D.Sc., Prof.

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doi: 10.17586/2226-1494-2021-21-6-801-807

A fiber optic vibration sensor based on SMF-MMF-SMF structure and a tilted fiber Bragg grating

A. A. Dmitriev, K. V. Grebnev, S. V. Varzhel, M. Y. Plotnikov

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Article in Russian

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Dmitriev A.A., Grebnev K.V., Varzhel S.V., Plotnikov M.Yu. A fiber optic vibration sensor based on SMF-MMF-SMF structure and a tilted fiber Bragg grating. Scientific and Technical Journal of Information Technologies, Mechanics and Optics, 2021, vol. 21, no. 6, pp. 801–807 (in Russian). doi: 10.17586/2226-1494-2021-21-6-801-807

Abstract

The paper proposes a version of realization for a fiber optic vibration sensor. The sensor possesses a wide range of operation frequencies with such interrogation devices as optical power meters. In comparison to spectral measuring complexes, the sensor imposes lower requirements on operating conditions. The authors investigated a sensing head based on a fiber SMF-MMF-SMF structure and a fiber Bragg grating inscribed in this structure. The external vibration frequency applied to the tested sensor structure is obtained using the Fourier transform of the signal received from the photodetector. The structure designed in this study with a fiber Bragg grating inscribed in it can be used as a sensing head of a fiber optic vibration sensor. It is demonstrated that the sensor based on the developed sensitive structure is able to obtain the external vibration frequency in the range of 20-9000 Hz with accuracy up to 1%. The research results are essential for monitoring systems for the state of structural elements of buildings and structures. The implementation of the vibration sensor in the format of a fiber optic device allows overcoming the limitations of piezoelectric sensors, providing high noise immunity and resistance to harsh environmental effects.

Keywords: fiber Bragg grating, fiber optic sensor, vibration sensor, cladding modes, Fourier transform

Acknowledgements. This work was done at ITMO University and was supported by the Ministry of Science and Higher Education of the Russian Federation under the Agreement No. 075-11-2019-026 dated November 27, 2019, within the project “The production development of fiber-optic gyroscopes for application in measuring instruments and land vehicle systems”.

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