PSI - Issue 50

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2022) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2022) 000 – 000

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Procedia Structural Integrity 50 (2023) 184–191

16th International Conference on Mechanics, Resource and Diagnostics of Materials and Structures (MRDMS 2022) Strain registration in the gradient zone by two types of fiber-optic sensors 16th International Conference on Mechanics, Resource and Diagnostics of Materials and Structures (MRDMS 2022) Strain registration in the gradient zone by two types of fiber-optic sensors

Valerii Matveenko a , Natalia Kosheleva a *, Grigorii Serovaev a a Institute of Continuous Media Mechanics UB RAS, 1, Akademika Koroleva Str., Perm, 614068, Russia Valerii Matveenko a , Natalia Kosheleva a *, Grigorii Serovaev a a Institute of Continuous Media Mechanics UB RAS, 1, Akademika Koroleva Str., Perm, 614068, Russia

© 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0 ) Peer-review under responsibility of the scientific committee of the MRDMS 2022 organizers Abstract Reliable measurement of strain in various sections of the monitored structure is an important problem for creating Structural Health Monitoring systems. Fiber-optic sensors have great potential to solve this problem. This paper presents the results of experiments on strain measurements in zones of homogeneous and gradient strain distribution using point fiber-optic sensors based on Bragg gratings and distributed fiber-optic sensors based on Rayleigh backscattering. Two types of fiber-optic sensors have demonstrated the ability to measure an inhomogeneous strain field and a satisfactory correspondence of the measurement results. © 202 3 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the MRDMS 2022 organizers. Keywords: point fiber-optic sensors; fiber Bragg grating; distributed fiber-optic sensors; spectral shift quality; strain registration; gradient zones 1. Introduction External and internal control systems mainly use piezoelectric, acoustic, thermal, electromagnetic, and electrical sensors (strain gauges) as sensing elements, which are fixed at various points on the structure under inspection. However, the increased requirements on the quality of sensor fixing, the presence of high external noise and vibration levels, strong electromagnetic fields, the additional weight of the sensors themselves, and the need for additional power supply make it difficult to use these sensing elements in monitoring systems. Sensors based on Abstract Reliable measurement of strain in various sections of the monitored structure is an important problem for creating Structural Health Monitoring systems. Fiber-optic sensors have great potential to solve this problem. This paper presents the results of experiments on strain measurements in zones of homogeneous and gradient strain distribution using point fiber-optic sensors based on Bragg gratings and distributed fiber-optic sensors based on Rayleigh backscattering. Two types of fiber-optic sensors have demonstrated the ability to measure an inhomogeneous strain field and a satisfactory correspondence of the measurement results. © 202 3 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the MRDMS 2022 organizers. Keywords: point fiber-optic sensors; fiber Bragg grating; distributed fiber-optic sensors; spectral shift quality; strain registration; gradient zones 1. Introduction External and internal control systems mainly use piezoelectric, acoustic, thermal, electromagnetic, and electrical sensors (strain gauges) as sensing elements, which are fixed at various points on the structure under inspection. However, the increased requirements on the quality of sensor fixing, the presence of high external noise and vibration levels, strong electromagnetic fields, the additional weight of the sensors themselves, and the need for additional power supply make it difficult to use these sensing elements in monitoring systems. Sensors based on

* Corresponding author. Tel.: +7(342)-237-83-08. E-mail address: kosheleva.n@icmm.ru * Corresponding author. Tel.: +7(342)-237-83-08. E-mail address: kosheleva.n@icmm.ru

2452-3216 © 2023 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the MRDMS 2022 organizers . 2452-3216 © 2023 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the MRDMS 2022 organizers .

2452-3216 © 2023 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the MRDMS 2022 organizers 10.1016/j.prostr.2023.10.040