PSI - Issue 50

Valerii Matveenko et al. / Procedia Structural Integrity 50 (2023) 184–191 Valerii Matveenko, Natalia Kosheleva, Grigorii Serovaev / Structural Integrity Procedia 00 (2022) 000 – 000

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Based on the obtained results, it can be concluded that for the strain field under consideration 5 mm gage length is the most optimal for distributed measurements based on the Rayleigh backscattering. An increase in this parameter leads to a decrease in the quality of correlation in areas of high strain gradient. 4. Conclusions Samples are presented to allow validation of fiber-optic sensors in zones with homogeneous and gradient strain distributions. The specimens with homogeneous strain distribution do not require special test equipment, which ensures their efficient use for fiber-optic sensor approbation, including their calibration. The results of strain measurement of FOS based on Bragg gratings and DFOS based on Rayleigh scattering in zones of homogeneous and gradient strain distribution are presented. The presented results show satisfactory coincidence of the strain values obtained using the considered fiber-optic sensor. A technique for choosing the optimal gage length, which is used to calculate the strains at the corresponding strain gradient, is presented. Acknowledgements The paper was prepared in the framework of the program for the creation and development of the world-class scientific center «Supersonic»; for 2020– 2025 with the financial support of the Ministry of Education and Science of the Russian Federation (Agreement No. 075-15-2022-329 of April 21, 2022). References Bado, M. F. and Casas, J. R. 2021. A Review of Recent Distributed Optical Fiber Sensors Applications for Civil Engineering Structural Health Monitoring, Sensors , 21(5), p. 1818. doi: 10.3390/s21051818. Drusová, S. et al. 2021. Comparison of three types of fiber optic sensors for temperature monitoring in a groundwater flow simulator, Sensors and Actuators A: Physical , 331, p. 112682. doi: 10.1016/j.sna.2021.112682. Fan, L. and Bao, Y. 2021. Review of fiber optic sensors for corrosion monitoring in reinforced concrete, Cement and Concrete Composites , 120, p. 104029. doi: 10.1016/j.cemconcomp.2021.104029. He, Z. et al. 2022. Integrated structural health monitoring in bridge engineering, Automation in Construction , 136, p. 104168. doi: 10.1016/j.autcon.2022.104168. Jayawickrema, U. M. N. et al. 2022. Fibre-optic sensor and deep learning-based structural health monitoring systems for civil structures: a review, Measurement , p. 111543. doi: 10.1016/j.measurement.2022.111543. Kreger, S. T. et al. 2006. High Resolution Distributed Strain or Temperature Measurements in Single- and Multi-Mode Fiber Using Swept Wavelength Interferometry, in Optical Fiber Sensors . Washington, D.C.: OSA, p. ThE42. doi: 10.1364/OFS.2006.ThE42. Kreger, S. T. et al. 2009. Distributed strain and temperature sensing in plastic optical fiber using Rayleigh scatter, in Udd, E., Du, H. H., and Wang, A. (eds), p. 73160A. doi: 10.1117/12.821353. Leung, C. K. Y. et al. 2015. Review: optical fiber sensors for civil engineering applications, Materials and Structures , 48(4), pp. 871 – 906. doi: 10.1617/s11527-013-0201-7. Luna Technologies Inc. 2013. Optical Backscatter Reflectometer 4600 User Guide, p. 227. Matveenko, V., Kosheleva, N. and Serovaev, G. 2021. Damage detection in materials based on strain measurements, Acta Mechanica , 232(5), pp. 1841 – 1851. doi: 10.1007/s00707-020-02830-4. Matveenko, V. P. et al. 2018. Measurement of strains by optical fiber Bragg grating sensors embedded into polymer composite material, Structural Control and Health Monitoring , 25(3), p. e2118. doi: 10.1002/stc.2118. Rocha, H., Semprimoschnig, C. and Nunes, J. P. 2021. Sensors for process and structural health monitoring of aerospace composites: A review, Engineering Structures , 237, p. 112231. doi: 10.1016/j.engstruct.2021.112231. Sun, M.-Y. et al. 2019. Development of FBG salinity sensor coated with lamellar polyimide and experimental study on salinity measurement of gravel aquifer, Measurement , 140, pp. 526 – 537. doi: 10.1016/j.measurement.2019.03.020. Tosi, D. et al. 2018. Fiber Optic Sensors for Biomedical Applications, in Opto-Mechanical Fiber Optic Sensors . Elsevier, pp. 301 – 333. doi: 10.1016/B978-0-12-803131-5.00011-8. Wijaya, H., Rajeev, P. and Gad, E. 2021. Distributed optical fibre sensor for infrastructure monitoring: Field applications, Optical Fiber Technology , 64, p. 102577. doi: 10.1016/j.yofte.2021.102577. Wu, T. et al. 2020. Recent Progress of Fiber-Optic Sensors for the Structural Health Monitoring of Civil Infrastructure, Sensors , 20(16), p. 4517. doi: 10.3390/s20164517. Ye, C. et al. 2020. Evaluating prestress losses in a prestressed concrete girder railway bridge using distributed and discrete fibre optic sensors, Construction and Building Materials , 247, p. 118518. doi: 10.1016/j.conbuildmat.2020.118518.