Mechanics of Bond and Interface Shear Transfer in Optical Fiber Sensors

Ansari, Farhad; Yuan, Libo

doi:10.1061/(asce)0733-9399(1998)124:4(385)

Cited by 241 publications

(160 citation statements)

References 10 publications

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“…They have the advantages of high sensitively and high spatial resolution. Based on single mode optical fibers, the three most widely employed interferometric configurations are: Mach-Zehnder [8], Michelson [9] with a two-arm interferometer and Fabry-Pérot [10][11][12] with a single arm interferometer.…”

Section: Introductionmentioning

confidence: 99%

The Effects of Adhesive and Bonding Length on the Strain Transfer of Optical Fiber Sensors

Her

Huang

2016

Applied Sciences

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Optical fiber sensors have been extensively adapted as structural health monitoring devices. Due to the existence of the adhesive layer, a portion of the strain is absorbed by the adhesive. As a result, the structural strain sensed by the optical fiber is underestimated and required to be corrected. An analytical solution is presented through which it is possible to establish the relationship between the strains in the host structure and the surface bonded optical fiber sensor. Experimental measurements based on the Mach-Zehnder interferometric technique were performed to validate the theoretical prediction and reveal the differential strains between the optical fiber strain sensor and test specimen. Parametric studies show that the percentage of the strain in the test specimen actually transferred to the optical fiber is dependent on the bonding length of the optical fiber and the adhesive. The strain transfer is increasing from 56% to 82% as the bonding length increases from 5 cm to 12 cm with the epoxy adhesive. The general trend of the strain transfer obtained from both experimental tests and theoretical predictions shows that the longer the bonding length and the stiffer the adhesive, the more strain is transferred to the optical fiber.

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Section: Introductionmentioning

confidence: 99%

The Effects of Adhesive and Bonding Length on the Strain Transfer of Optical Fiber Sensors

Her

Huang

2016

Applied Sciences

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“…Two main issues have to be considered. First, for strain measurement, a substantial level of adherence is required between the optical fiber and the surrounding coating, as well as between the coating and concrete in order to get an optimal transfer of strain from the concrete matrix to the fiber [9]. Secondly, a good durability of the sensing cable is mandatory as the cable is expected to last for decades especially when embedded in concrete and without any possibility of replacement.…”

Section: Performances Of Sensing Cables For the Monitoring Of Concretmentioning

confidence: 99%

Qualification of a truly distributed fiber optic technique for strain and temperature measurements in concrete structures

Hénault

Salin²,

Moreau³

et al. 2011

EPJ Web of Conferences

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Abstract. Structural health monitoring is a key factor in life cycle management of infrastructures. Truly distributed fiber optic sensors are able to provide relevant information on large structures, such as nuclear power plants or nuclear waste disposal facilities. The sensing chain includes an optoelectronic unit and a sensing cable made of one or more optical fibers. A new instrument based on Optical Frequency Domain Reflectometry (OFDR), enables to perform temperature and strain measurements with a centimeter scale spatial resolution over hundred of meters and with a level of precision equal to 1 strain and 0.1• C. Several sensing cables are designed with different materials targeting to last for decades, either embedded in the concrete or attached to the surface of the structure. They must ensure an optimal transfer of temperature and strain from the concrete matrix to the optical fiber. Based on the European guide FD CEN/TR 14748 "Non-destructive testing -Methodology for qualification of non-destructive tests", a qualification method was developed. Tests were carried out using various sensing cables embedded in the volume or fixed to the surface of plain concrete specimens and representative-scale reinforced concrete structural elements. Measurements were performed with an OFDR instrument, while mechanical solicitations were imposed to the concrete element. Preliminary experiments seem very promising since measurements performed with distributed sensing systems are found comparable to values obtained with conventional sensors used in civil engineering and with the Strength of Materials Modelling. Moreover, the distributed sensing system makes it possible to detect and localize cracks appearing in concrete during the mechanical loading.

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“…Sensor with optical fiber coating layer is presented [5], the matrix structure, the matrix structure to the stress of the fiber optic sensor transitive relation. Analysis of the elastic modulus and thickness of coating layer's influence on the stress transfer and stress (concentration).…”

Section: Introductionmentioning

confidence: 99%