A theoretical strain transfer model between optical fiber sensors and monitored substrates

2021 ◽  
Author(s):  
Chengyu Hong ◽  
Qiang Yang ◽  
Xiaohui Sun ◽  
Weibin Chen ◽  
Kaihang Han
Keyword(s):  
Optical Fiber ◽  
Optical Fiber Sensors ◽  
Transfer Model ◽  
Fiber Sensors ◽  
Strain Transfer

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

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.

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 Strain Transfer Characteristics of Multi-Layer Optical Fiber Sensors with Temperature-Dependent Properties at Low Temperature

Sensors ◽  
2021 ◽  
Vol 21 (2) ◽  
pp. 495
Author(s):  
Taolue Yang ◽  
Huaping Wang ◽  
Xingzhe Wang
Keyword(s):  
Low Temperature ◽  
Optical Fiber ◽  
Optical Fiber Sensors ◽  
Large Temperature ◽  
Temperature Dependent ◽  
Fiber Sensors ◽  
Strain Transfer ◽  
Transfer Characteristics ◽  
Temperature Dependent Properties ◽  
Temperature Loads

Optical fiber sensors have been potentially expected to apply in the extreme environment for their advantages of measurement in a large temperature range. The packaging measure which makes the strain sensing fiber survive in these harsh conditions will commonly introduce inevitable strain transfer errors. In this paper, the strain transfer characteristics of a multi-layer optical fiber sensing structure working at cryogenic environment with temperature gradients have been investigated theoretically. A generalized three-layer shear lag model incorporating with temperature-dependent properties of layers was developed. The strain transfer relationship between the optical fiber core and the matrix has been derived in form of a second-order ordinary differential equation (ODE) with variable coefficients, where the Young’s modulus and the coefficients of thermal expansion (CTE) are considered as functions of temperature. The strain transfer characteristics of the optical sensing structure were captured by solving the ODE boundary problems for cryogenic temperature loads. Case studies of the cooling process from room temperature to some certain low temperatures and gradient temperature loads for different low-temperature zones were addressed. The results showed that different temperature load configurations cause different strain transfer error features which can be described by the proposed model. The protective layer always plays a main role, and the optimization geometrical parameters should be carefully designed. To verify the theoretical predictions, an experiment study on the thermal strain measurement of an aluminum bar with optical fiber sensors was conducted. LUNA ODiSI 6100 integrator was used to measure the Rayleigh backscattering spectra shift of the optical fiber at a uniform temperature and a gradient temperature under liquid nitrogen temperature zone, and a reasonable agreement with the theory was presented.

Strain transfer errors of optical fiber sensors embedded in asphalt pavement

2015 ◽  
Vol 23 (6) ◽  
pp. 1499-1507 ◽  
Author(s):  
王花平 WANG Hua-ping ◽  
周智 ZHOU Zhi ◽  
王倩 WANG Qian ◽  
刘婉秋 LIU Wan-qiu ◽  
贾及汉 JIA Ji-han
Keyword(s):  
Optical Fiber ◽  
Asphalt Pavement ◽  
Optical Fiber Sensors ◽  
Fiber Sensors ◽  
Strain Transfer

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.

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