Experimental and numerical analysis of a hybrid FBG long gauge sensor for structural health monitoring

This paper presents a new long gauge sensor for structural health monitoring based on the use of Fiber Bragg gratings. The proposed sensor has the advantage over existing sensors that it does not require prestressing of the optical fiber. The development consisted of numerical studies complemented by experimental tests to analyze: (1) the strain transfer between the sensor and the host structure; (2) the in!uence of sensor axial stiffness on the structural behavior of the host structure; (3) the in!uence of the mechanical properties of the adhesive used to fix the sensor and (4) the failure modes of the sensor (buckling and shear stress of sensor anchors). This work was made possible by the support from the Universitat Politecnica de Valencia, the Spanish Ministry for Science and Innovation (Research Project BIA2011-27104) and the Spanish Ministry of Public Works (Project Sopromac P41/08). Torres Górriz, B.; Calderón García, PA.; Paya-Zaforteza, I.; Sales Maicas, S. (2014). Experimental and numerical analysis of a hybrid FBG long gauge sensor for structural health monitoring. Measurement Science and Technology. 25:1-15. https://doi.org/10.1088/0957-0233/25/12/125107 Glišić, B., & Inaudi, D. (2007). Fibre Optic Methods for Structural Health Monitoring. doi:10.1002/9780470517819 Kissinger, T., Charrett, T. O. H., & Tatam, R. P. (2013). Fibre segment interferometry using code-division multiplexed optical signal processing for strain sensing applications. Measurement Science and Technology, 24(9), 094011. doi:10.1088/0957-0233/24/9/094011 Abang, A., & Webb, D. J. (2013). Effects of annealing, pre-tension and mounting on the hysteresis of polymer strain sensors. Measurement Science and Technology, 25(1), 015102. doi:10.1088/0957-0233/25/1/015102 Calderón, P. A., & Glisic, B. (2012). Influence of mechanical and geometrical properties of embedded long-gauge strain sensors on the accuracy of strain measurement. Measurement Science and Technology, 23(6), 065604. doi:10.1088/0957-0233/23/6/065604 Torres, B., Payá-Zaforteza, I., Calderón, P. A., & Adam, J. M. (2011). Analysis of the strain transfer in a new FBG sensor for Structural Health Monitoring. Engineering Structures, 33(2), 539-548. doi:10.1016/j.engstruct.2010.11.012 Majumder, M., Gangopadhyay, T. K., Chakraborty, A. K., Dasgupta, K., & Bhattacharya, D. K. (2008). Fibre Bragg gratings in structural health monitoring—Present status and applications. Sensors and Actuators A: Physical, 147(1), 150-164. doi:10.1