Strain and Temperature Monitoring of Asymmetric Composite Laminate using FBG Hybrid Sensors

Guo, Zhan‐Sheng

doi:10.1177/14759217070060030201

Cited by 27 publications

(14 citation statements)

References 19 publications

(17 reference statements)

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“…However, compensation techniques are required because of the temperature sensitivity of FBGs. Generally, the FBG strain sensor is used together with an FBG temperature sensor …”

Section: Introductionmentioning

confidence: 99%

“…Generally, the FBG strain sensor is used together with an FBG temperature sensor. 25 Devices that use core diameter mismatch (CDM) such as single-mode-multimode-single-mode (SMS) fibers have been just suggested as fiber sensors in response to their simple manufacturing and inexpensive cost. [26][27][28][29] These SMS sensors are developed by splicing a piece of multimode fiber (MMF) between two single mode fibers (SMFs).…”

Section: Introductionmentioning

confidence: 99%

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Strain sensing based on a core diameter mismatch structure

Fernandes

Giraldi

Sousa

et al. 2019

Micro & Optical Tech Letters

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In this paper, it is proposed and experimentally investigated a sensor structure based on a core diameter mismatch technique for strain sensing. An uncoated short section of multimode fiber is spliced between two standard single mode fibers forming the sensor structure, called the SMS (single‐mode‐multimode‐single‐mode) sensor. The proposed SMS sensor, in the strain analysis, generates destructive or constructive interference patterns as load or strain are applied, changing the power of the optical signal only, without varying the wavelength. The sensor configuration offers several motivating attributes, such as easy fabrication, low‐cost, high‐efficiency and high sensitivity, moreover allows interrogation of the optical signal using the transmitted or reflected total optical power. The results and these advantages indicate that the proposed SMS sensor device is suitable for strain measurement, which is helpful in a broad range of applications, for instance, structural health monitoring.

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“…However, compensation techniques are required because of the temperature sensitivity of FBGs. Generally, the FBG strain sensor is used together with an FBG temperature sensor …”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Strain sensing based on a core diameter mismatch structure

Fernandes

Giraldi

Sousa

et al. 2019

Micro & Optical Tech Letters

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“…The Fiber Bragg grating (FBG) sensor, due to its high sensitivity, resistance to electromagnetic interference, good durability, low cost, and more importantly capability of real-time monitoring, has become a widely accepted sensing alternative for strain [27][28][29], temperature [29][30][31], and possibly crack measurements [32,33] in civil engineering fields. Studies of using FBG sensors in crack detection on concrete and metallic structures had shown that distinguishable data alter could be observed when cracks initiated.…”

Section: Introductionmentioning

confidence: 99%

Pitted Corrosion Detection of Thermal Sprayed Metallic Coatings Using Fiber Bragg Grating Sensors

et al. 2017

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Metallic coatings using thermal spraying techniques are widely applied to structural steels to protect infrastructure against corrosion and improve durability of the associated structures for longer service life. The thermal sprayed metallic coatings consisting of various metals, although have higher corrosion resistance, will still corrode in a long run and may also subject to corrosion induced damages such as cracks. Corrosion and the induced damages on the metallic coatings will reduce the effectiveness of the coatings for protection of the structures. Timely repair on these damaged metallic coatings will significantly improve the reliability of protected structures again deterioration. In this paper, an inline detection system for corrosion and crack detection was developed using fiber Bragg (FBG) grating sensors. Experimental results from laboratory accelerated corrosion tests showed that the developed sensing system can quantitatively detect corrosion rate of the coating, corrosion propagations, and cracks initialized in the metallic coating in real time. The developed system can be used for real-time corrosion detection of coated metal structures in field.

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“…For optical fiber strain sensors to be accurate and practical, it is necessary to separate the mechanical strain from the thermal effect. Several techniques have been proposed for the mechanical strain and temperature discrimination, such as the reference-grating technique [9], the dual-wavelength technique [10] and the hybrid-grating technique [11]. To separate the mechanical strain from the temperature effect, it is necessary to determine the thermal strain of the optical fiber sensor when the host structure is subjected to a temperature change.…”

Section: Introductionmentioning

confidence: 99%

Thermal Strain Analysis of Optic Fiber Sensors

Her

Huang

2013

Sensors

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An optical fiber sensor surface bonded onto a host structure and subjected to a temperature change is analytically studied in this work. The analysis is developed in order to assess the thermal behavior of an optical fiber sensor designed for measuring the strain in the host structure. For a surface bonded optical fiber sensor, the measuring sensitivity is strongly dependent on the bonding characteristics which include the protective coating, adhesive layer and the bonding length. Thermal stresses can be generated due to a mismatch of thermal expansion coefficients between the optical fiber and host structure. The optical fiber thermal strain induced by the host structure is transferred via the adhesive layer and protective coating. In this investigation, an analytical expression of the thermal strain and stress in the optical fiber is presented. The theoretical predictions are validated using the finite element method. Numerical results show that the thermal strain and stress are linearly dependent on the difference in thermal expansion coefficients between the optical fiber and host structure and independent of the thermal expansion coefficients of the adhesive and coating.

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Strain and Temperature Monitoring of Asymmetric Composite Laminate using FBG Hybrid Sensors

Cited by 27 publications

References 19 publications

Strain sensing based on a core diameter mismatch structure

Strain sensing based on a core diameter mismatch structure

Pitted Corrosion Detection of Thermal Sprayed Metallic Coatings Using Fiber Bragg Grating Sensors

Thermal Strain Analysis of Optic Fiber Sensors

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