Unified approach to phase-strain-temperature models for smart structure interferometric optical fiber sensors: part 1, development

Sirkis, James S.

doi:10.1117/12.61199

Cited by 115 publications

(59 citation statements)

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“…The excitation is applied to the sensing fiber, resulting in optical path difference between the reference and sensing fibers. The light intensity of the output of the Mach-Zehnder interferometer can be expressed as [19] I " 2A 2 p1`cos∆φq…”

Section: Mach-zehnder Interferometric Sensormentioning

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: Mach-zehnder Interferometric Sensormentioning

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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“…When an FBG sensor is applied to a structure that is under only a thermal strain, the net wavelength change of the FBG sensor can be expressed as the sum of two terms, the first a refractive index change and the second the thermal strain of the structure itself, as shown in Eq. (6) [16].…”

Section: Principles Of Fbg Sensormentioning

confidence: 98%

Full-scale test of a concrete box girder using FBG sensing system

Chung

Kang

2008

Engineering Structures

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“…Under the assumptions that the strain is constant over the cross section of the core of the fiber and that shear strain can be neglected, the Bragg wavelength as a function of strain along the principal axes (ε x = parallel to surface, ε y = perpendicular to surface, ε z = direction of fiber axis) are given by Sirkis for a plane strain condition [3], …”

Section: Theorymentioning

confidence: 99%

Glue-induced birefringence in surface-attached FBG strain sensors

2014

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The influence of the gluing process on the birefringence of surface-glued FBGs that were inscribed in highly birefringence (HiBi) optical fibers of type Panda was studied by monitoring the variation of the birefringence during the gluing procedure. The isothermal curing process at 100°C of the epoxy-based adhesive is characterized by the reduction of birefringence during curing. Significant transversal strain is introduced into the fiber during the cool down period, which is due to different thermal expansion coefficients of the silica and the glue. When the slow axis of the HiBi fiber is oriented parallel to the surface, the glue-induced transversal strain reduces the birefringence of the fiber by ΔB = -6.6 10 -5 and when it is perpendicular to the surface, it is increased by ΔB = 1.1 10 -5 . It can be estimated that for conventional FBGs in single mode fibers a glue-induced birefringence in the order of ΔB = 3.4 10 -5 can be expected, which has to be taken into account if in surface-mounted FBG-based strain measurements a high accuracy has to be achieved.

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Unified approach to phase-strain-temperature models for smart structure interferometric optical fiber sensors: part 1, development

Cited by 115 publications

References 0 publications

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

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

Full-scale test of a concrete box girder using FBG sensing system

Glue-induced birefringence in surface-attached FBG strain sensors

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