Stress Analysis of Optical Fiber Sensor Embedded Composite Subjected to Tri-Axial Normal Loadings

2007 ◽  
Vol 364-366 ◽  
pp. 998-1002
Author(s):  
Shiuh Chuan Her ◽  
Bo Ren Yao
Keyword(s):  
Optical Fiber ◽  
Optical Fiber Sensor ◽  
Smart Structure ◽  
Host Material ◽  
Theoretical Development ◽  
Fiber Sensors ◽  
Fiber Coating ◽  
Concentric Cylinders ◽  
Wide Range ◽  
Coating Matrix

Optical fiber sensors have been developed during the past decade to measure a wide range of physical quantities such as strain and temperature. The perturbation of the surrounding field in the host due to the presence of the optical sensor will not only alter the values of the field variables being measured, but may also affect the integrity of the host. Resulting degradations can compromise the accuracy and long term reliability of the smart structure. The present paper focuses the attention on constitutent interaction between the optical fiber, coating, matrix and host material. An analytical model to predict the stress fields in the vicinity of the embedded optical fiber was derived. The theoretical development was based on the four concentric cylinders models which represented the optical fiber, protective coating, matrix and host material, respectively. The interfaces between each constitutent were assumed to be perfect bonds, so that the tractions and displacements were continuous across each interface. In this investigation, the host structure was subjected to three normal loadings along the axial directions. Numerical examples were presented to investigate the effects of the coating and host material on the stress distribution in the vicinity of the embedded optical fiber.

Stress Analysis of Composite Material Embedded with Optical Fiber Sensor

2006 ◽  
Vol 326-328 ◽  
pp. 59-62
Author(s):  
Shiuh Chuan Her ◽  
Bo Ren Yao
Keyword(s):  
Optical Fiber ◽  
Optical Fibers ◽  
Electromagnetic Interference ◽  
Optical Fiber Sensor ◽  
Local Stress ◽  
Smart Structure ◽  
Fiber Optic Sensor ◽  
Host Material ◽  
Concentric Cylinders ◽  
Host Structure

Fiber optic sensor with small size, light weight and immunity to electromagnetic interference can be embedded and integrated into the host material to form a smart structure system. One must recognize that optical fibers are foreign entities to the host structure, therefore will alter the stress state in the vicinity of the embedded sensor irrespective of the small size of the fiber. This is a result of the material and geometric discontinuity introduced by the embedded optical fiber. In this study, the local stress fields in the vicinity of the embedded fiber are examined. The host material is considered to be a composite with reinforced fiber parallel to the optical fiber. The geometry in the vicinity of the embedded fiber is modeled by four concentric cylinders which represent the optical fiber, protective coating, resin and host material, respectively. In this investigation, the host structure is subjected to longitudinal normal stress and transverse hydro-static stress. The effects of the coating and host material on the stress distribution in the vicinity of the embedded optical fiber are presented through a parametric study.

Stress Analysis of Composite Material Embedded with Optical Fiber Sensor Subjected to In-Plane Shear

2010 ◽  
Vol 139-141 ◽  
pp. 137-140
Author(s):  
Shiuh Chuan Her ◽  
Bo Ren Yao
Keyword(s):  
Optical Fiber ◽  
Optical Fiber Sensor ◽  
High Stress ◽  
Shear Loading ◽  
Smart Structure ◽  
Host Material ◽  
Fiber Sensor ◽  
Plane Shear ◽  
Host Structure ◽  
Coating Matrix

Optical fiber sensor with small size, light weight and immunity to electromagnetic interference can be embedded and integrated into the host material to form an ideally smart structure system. One must recognize that optical fibers are foreign entities to the host structure, therefore will induce high stress state in the vicinity of the embedded sensor irrespective of the small size of the fiber. To address this concern, present paper focuses the attention on constituent interaction between the optical fiber, coating, matrix and host material. An analytical model to predict the stress fields in the vicinity of the embedded optical fiber is presented. The theoretical development is based on the four concentric cylinders model which represents the optical fiber, protective coating, matrix and host material, respectively. The host material is considered to be a composite with reinforced fiber parallel to the optical fiber. In this investigation, the host structure is subjected to in-plane shear loading. The effects of the coating and host material on the stress distribution in the vicinity of the embedded optical fiber are presented through a parametric study.

A Multiplexed Optical Fiber Sensor System For Distributed Measurement Of Structural Strains

1997 ◽  
Vol 503 ◽  
Author(s):  
F. Ansari ◽  
Z. Chen ◽  
Q. Li
Keyword(s):  
Optical Fiber ◽  
Optical Switch ◽  
Optical Fiber Sensor ◽  
Fiber Material ◽  
Smart Structure ◽  
Sensor System ◽  
Fiber Sensor ◽  
Fiber Sensors ◽  
Large Structures ◽  
Distributed Measurement

ABSTRACTStructurally integrated optical fiber sensors form the basis for smart structure technology. Over the past decade a variety of sensor configurations have been developed for measurement of strains and deformations in structures. Strains and deformations alter the refractive index and the geometry of the optical fiber material. These changes perturb the intensity, phase, and polarization of the light-wave propagating along the probing fiber. The optical perturbations are detected for the determination of strain. The research presented here describes the development of a new optical fiber sensor system for measurement of structural strains based on white light interferometry. An optical switch provides for multiplexing of strain signals from various locations in the structure. Redundant Bragg grating type fiber optic sensors as well as strain gauges were employed for comparison and verification of strain signals as measured by the new system. The system provides capability for distributed sensing of strains in large structures.

Strain Analysis of an Embedded Optical Fiber Sensor

2011 ◽  
Vol 467-469 ◽  
pp. 279-282
Author(s):  
Shiuh Chuan Her ◽  
Chang Yu Tsai
Keyword(s):  
Optical Fiber ◽  
Electromagnetic Interference ◽  
Optical Fiber Sensor ◽  
Strain Analysis ◽  
Adhesive Layer ◽  
Small Dimension ◽  
Host Material ◽  
Fiber Sensor ◽  
Fiber Sensors ◽  
Theoretical Predictions

Optical fiber sensors with light weight, small dimension and immunity to electromagnetic interference are widely used in structural health monitoring device. In this investigation, a theoretical model of the strain transferred from the host material to the embedded optical fiber is developed to reveal the differential strains between the optical fiber sensor and host material. The theoretical predictions are validated with the numerical analysis using the finite element method. The percentage of strain in the host material actually transferred to the optical fiber is dependent on the bonding characteristics such as adhesive layer, protective coating and host material. Parametric study shows that the larger of the host material the more strain is transferred to the optical fiber.

scholarly journals Development of Smart Structure for Satellite Using Optical Fiber Sensors

2017 ◽  
Vol 66 (4) ◽  
pp. 292-297
Author(s):  
Kazushi SEKINE ◽  
Masahiro MIYASHITA ◽  
Hiromi SEKO ◽  
Yuki KOBAYASHI
Keyword(s):  
Optical Fiber ◽  
Optical Fiber Sensors ◽  
Smart Structure ◽  
Fiber Sensors

scholarly journals Carbon Allotrope-Based Optical Fibers for Environmental and Biological Sensing: A Review

Sensors ◽  
2020 ◽  
Vol 20 (7) ◽  
pp. 2046 ◽  
Author(s):  
Stephanie Hui Kit Yap ◽  
Kok Ken Chan ◽  
Swee Chuan Tjin ◽  
Ken-Tye Yong
Keyword(s):  
Optical Fiber ◽  
Optical Fibers ◽  
High Sensitivity ◽  
Optical Fiber Sensors ◽  
Functional Coating ◽  
Fiber Sensors ◽  
Carbon Allotrope ◽  
Carbon Allotropes ◽  
Sensing Technology ◽  
Wide Range

Recently, carbon allotropes have received tremendous research interest and paved a new avenue for optical fiber sensing technology. Carbon allotropes exhibit unique sensing properties such as large surface to volume ratios, biocompatibility, and they can serve as molecule enrichers. Meanwhile, optical fibers possess a high degree of surface modification versatility that enables the incorporation of carbon allotropes as the functional coating for a wide range of detection tasks. Moreover, the combination of carbon allotropes and optical fibers also yields high sensitivity and specificity to monitor target molecules in the vicinity of the nanocoating surface. In this review, the development of carbon allotropes-based optical fiber sensors is studied. The first section provides an overview of four different types of carbon allotropes, including carbon nanotubes, carbon dots, graphene, and nanodiamonds. The second section discusses the synthesis approaches used to prepare these carbon allotropes, followed by some deposition techniques to functionalize the surface of the optical fiber, and the associated sensing mechanisms. Numerous applications that have benefitted from carbon allotrope-based optical fiber sensors such as temperature, strain, volatile organic compounds and biosensing applications are reviewed and summarized. Finally, a concluding section highlighting the technological deficiencies, challenges, and suggestions to overcome them is presented.

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.

Strain Analysis of Surface Bonded Optical Fiber Sensors

2011 ◽  
Vol 121-126 ◽  
pp. 4166-4170
Author(s):  
Shiuh Chuan Her ◽  
Chang Yu Tsai
Keyword(s):  
Optical Fiber ◽  
Electromagnetic Interference ◽  
Optical Fiber Sensor ◽  
Strain Analysis ◽  
Adhesive Layer ◽  
Optical Fiber Sensors ◽  
Fiber Sensor ◽  
Fiber Sensors ◽  
Theoretical Predictions ◽  
Host Structure

Optical fiber sensors with light weight, small size and immunity to electromagnetic interference have been found to be a promising device for use in the development of smart structures. It is well known that the strain transfer from the host structure to the optical fiber sensor is dependent on the bonding characteristics such as adhesive layer and bonded length. In this investigation, the optical fiber sensor is surface bonded on the host structure. A theoretical model consisting of the optical fiber, adhesive layer and host material, is proposed to determine the strain in the optical fiber sensor induced by the host structure. The theoretical predictions were validated with the numerical analysis using the finite element method.

scholarly journals A Highly Sensitive and Miniature Optical Fiber Sensor for Electromagnetic Pulse Fields

Sensors ◽  
2021 ◽  
Vol 21 (23) ◽  
pp. 8137
Author(s):  
Min Zhao ◽  
Xing Zhou ◽  
Yazhou Chen
Keyword(s):  
Optical Fiber ◽  
Electromagnetic Pulse ◽  
Strong Field ◽  
Optical Fiber Sensor ◽  
Weak Field ◽  
Pulse Field ◽  
Fiber Sensors ◽  
Field Environment ◽  
Field Sensor ◽  
The Time Domain

The detection of an electromagnetic pulse (EMP) field is of great significance in determining the field environment of tested equipment in small spaces. Finger-shaped miniature optical fiber sensors for electromagnetic pulse field measurement were designed. The antenna of a weak field sensor was integrated with a shielding shell, and the wire welded at the direct electro-optic converting circuit connected to an optical fiber through special structure and circuit design was taken as the antenna of a strong field sensor. Measurements in the time domain and frequency domain had been carried out for the two sensors. Experiment results demonstrate that the weak field sensor and the strong field sensor have flat responses from 100 kHz to 1 GHz with a variation of 2.3 dB and 2.9 dB, respectively, and the EMP waveform detected by the sensors agrees well with the applied standard square wave. Moreover, the strong field sensor exhibits linear responses from 645 V/m to 83 kV/m. The resolution of the weak field sensor is as low as 13 V/m. The result indicated that the designed sensors had good performance.

scholarly journals Distributed Optical Fiber Sensor Applications in Geotechnical Monitoring

Sensors ◽  
2021 ◽  
Vol 21 (22) ◽  
pp. 7514
Author(s):  
Aldo Minardo ◽  
Luigi Zeni ◽  
Agnese Coscetta ◽  
Ester Catalano ◽  
Giovanni Zeni ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Brillouin Scattering ◽  
Optical Fiber Sensor ◽  
Early Warning Systems ◽  
Optical Fiber Sensors ◽  
Small Scale ◽  
Sudden Increase ◽  
Fiber Sensors ◽  
Artificial Rainfall ◽  
Distributed Optical Fiber

We report the experimental application of distributed optical fiber sensors, based on stimulated Brillouin scattering (SBS), to the monitoring of a small-scale granular slope reconstituted in an instrumented flume and subjected to artificial rainfall until failure, and to the monitoring of a volcanic rock slope. The experiments demonstrate the sensors’ ability to reveal the sudden increase in soil strain that foreruns the failure in a debris flow phenomenon, as well as to monitor the fractures in the tuff rocks. This study offers an important perspective on the use of distributed optical fiber sensors in the setting up of early warning systems for landslides in both rock and unconsolidated materials.

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