scholarly journals Strain Transfer in Surface-Bonded Optical Fiber Sensors

Sensors ◽  
2020 ◽  
Vol 20 (11) ◽  
pp. 3100 ◽  
Author(s):  
Francesco Falcetelli ◽  
Leonardo Rossi ◽  
Raffaella Di Sante ◽  
Gabriele Bolognini
Keyword(s):  
Optical Fiber ◽  
Multilayered Structure ◽  
Fiber Optic Sensors ◽  
Analytical Models ◽  
Transfer Model ◽  
Engineering Structures ◽  
Fiber Sensors ◽  
Strain Transfer ◽  
Cable Structure ◽  
Bonding Length

Fiber optic sensors represent one of the most promising technologies for the monitoring of various engineering structures. A major challenge in the field is to analyze and predict the strain transfer to the fiber core reliably. Many authors developed analytical models of a coated optical fiber, assuming null strain at the ends of the bonding length. However, this configuration only partially reflects real experimental setups in which the cable structure can be more complex and the strains do not drastically reduce to zero. In this study, a novel strain transfer model for surface-bonded sensing cables with multilayered structure was developed. The analytical model was validated both experimentally and numerically, considering two surface-mounted cable prototypes with three different bonding lengths and five load cases. The results demonstrated the capability of the model to predict the strain profile and, differently from the available strain transfer models, that the strain values at the extremities of the bonded fiber length are not null.

Strain Transfer Analysis for Surface Bonded Fiber Sensor Considering Temperature Influence

2020 ◽  
Author(s):  
Xiaochen Hu ◽  
Zhaoyan Fan
Keyword(s):  
Numerical Model ◽  
Optical Fiber ◽  
Analytical Model ◽  
Optical Fiber Sensors ◽  
Fiber Optic Sensor ◽  
Fiber Sensors ◽  
Strain Transfer ◽  
Transfer Ratio ◽  
Key Characteristics ◽  
Bonding Length

Abstract Strain transfer ratio is one of the key characteristics to determine the accuracy of sensors for strain measurement and structural health monitoring. This paper presented a theoretical study on the strain transfer ratio of optical fiber sensors, which is generally bonded on the surface of target structure by adhesives to measure strain or stress. Compared to the prior efforts where only one type of loads, either mechanical or thermal, is considered, this paper included both of them in the modeling of strain transfer ratio and derived a general analytical expression for their relationships. It has been found that the strain transfer ratio is not a constant in some cases but varies with the strain being measured. The work studied the characteristics of fiber optic sensor in two consecutive approaches: 1) A simplified 2-dimentional multi-layer analytical model was built to derive the expression of strain transfer ratio as a function of the structural and material properties; 2) a numerical model that considers the realistic 3-dimentional structure of the sensor installation scenario was established for validating the analytical model in different case studies. Simulation results have shown that the analytical model matches well with the behavior of strain transfer ratio estimated by the numerical model, with an error less than 1.35%. Based on the validated analytical model, the discussion was further extended to derive the lower limit of the bonding length of optical fiber sensors to satisfy the requirement of measurement accuracy.

scholarly journals Effect of Coating on the Strain Transfer of Optical Fiber Sensors

Sensors ◽  
2011 ◽  
Vol 11 (7) ◽  
pp. 6926-6941 ◽  
Author(s):  
Shiuh-Chuan Her ◽  
Chih-Ying Huang
Keyword(s):  
Optical Fiber ◽  
Optical Fiber Sensors ◽  
Fiber Sensors ◽  
Strain Transfer

Integrated Fiber Optic Sensors For Nondestructive Characterization Of Concrete Structures

1997 ◽  
Vol 503 ◽  
Author(s):  
F. Ansari
Keyword(s):  
Optical Fiber ◽  
Optical Fibers ◽  
Fiber Optic ◽  
Optical Fiber Sensor ◽  
Fiber Optic Sensors ◽  
Fiber Sensors ◽  
Fully Integrated ◽  
Integrated Optical ◽  
Concrete Elements

ABSTRACTIt is possible to monitor the initiation and progress of various mechanical or environmentally induced perturbations in concrete elements by way of fully integrated optical fiber sensors. Geometric adaptability and ease by which optical fibers can be embedded within concrete elements has led to the development of a number of innovative applications for concrete elements. This article is intended for a brief introduction into the theories, principles, and applications of fiber optic sensors as they pertain to applications in concrete.. However, due to the fact that the transduction mechanism in optical fibers is invariant of the materials employed, the principles introduced here also correspond to other structural materials. The only application related differences among various materials pertain to sensitivity and choice of optical fiber sensor types.

Validation of axial strain transfer from a composite laminate to embedded optical fiber sensors

1993 ◽  
Author(s):  
Mark S. Miller ◽  
Scott W. Case ◽  
Gregory P. Carman ◽  
C. A. Schmid ◽  
Russell G. May ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Composite Laminate ◽  
Axial Strain ◽  
Optical Fiber Sensors ◽  
Fiber Sensors ◽  
Strain Transfer

scholarly journals Concrete Crack Monitoring Using a Novel Strain Transfer Model for Distributed Fiber Optics Sensors

Sensors ◽  
2020 ◽  
Vol 20 (8) ◽  
pp. 2220 ◽  
Author(s):  
Antoine Bassil ◽  
Xavier Chapeleau ◽  
Dominique Leduc ◽  
Odile Abraham
Keyword(s):  
Optical Fiber ◽  
Fiber Optics ◽  
Fiber Optic ◽  
Transfer Model ◽  
Concrete Material ◽  
Fiber Optics Sensors ◽  
Strain Transfer ◽  
Optical Cable ◽  
Concrete Crack ◽  
Crack Monitoring

In this paper, we study the strain transfer mechanism between a host material and an optical fiber. A new analytical model handling imperfect bonding between layers is proposed. A general expression of the crack-induced strain transfer from fractured concrete material to optical fiber is established in the case of a multilayer system. This new strain transfer model is examined through performing wedge splitting tests on concrete specimens instrumented with embedded and surface-mounted fiber optic cables. The experimental results showed the validity of the crack-induced strain expression fitted to the distributed strains measured using an Optical Backscattering Reflectometry (OBR) system. As a result, precise estimations of the crack openings next to the optical cable location were achieved, as well as the monitoring of the optical cable response through following the strain lag parameter.

Sign in / Sign up

Export Citation Format

Share Document