Multi-parameter fiber optic sensors for structural health monitoring

Ivanov, Alexi

doi:10.22215/etd/2008-08454

Cited by 3 publications

(2 citation statements)

References 49 publications

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“…However, these depend on the wavelength of the Bragg resonance and slightly more accurate estimates can be found using "gauge factors" in the form of ∆λ/λ (where λ is the wavelength of a resonance). In those terms, the temperature and strain gauge factors for SMFs have been found to be 6.25 × 10 −6 /°C and 0.8 × 10 −6 /µstrain, respectively, for wavelengths in the near-infrared [188]. Still, more exhaustive characterizations or empirical calibrations are often carried out in applications where the highest possible accuracies are required, and the cost of such additional work justified.…”

Section: 6g Sensing In Multimodal Systems With Fiber Gratingsmentioning

confidence: 99%

Mode-division and spatial-division optical fiber sensors

et al. 2022

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The aim of this paper is to provide a comprehensive review of mode-division and spatial-division optical fiber sensors, mainly encompassing interferometers and advanced fiber gratings. Compared with their single-mode counterparts, which have a very mature field with many highly successful commercial applications, multimodal configurations have developed more recently with advances in fiber device fabrication and novel mode control devices. Multimodal fiber sensors considerably widen the range of possible sensing modalities and provide opportunities for increased accuracy and performance in conventional fiber sensing applications. Recent progress in these areas is attested by sharp increases in the number of publications and a rise in technology readiness level. In this paper, we first review the fundamental operating principles of such multimodal optical fiber sensors. We then report on the theoretical formalism and simulation procedures that allow for the prediction of the spectral changes and sensing response of these sensors. Finally, we discuss some recent cutting-edge applications, mainly in the physical and (bio)chemical fields. This paper provides both a step-by-step guide relevant for non-specialists entering in the field and a comprehensive review of advanced techniques for more skilled practitioners.

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Section: 6g Sensing In Multimodal Systems With Fiber Gratingsmentioning

confidence: 99%

Mode-division and spatial-division optical fiber sensors

et al. 2022

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“…This is due to the tense-compress effect as the fiber has different strain and stress in the cross section (Chen, 2008). As shows in Figure 3, the bending of an initially straight fiber generates compressive strain on the inside of the fiber and tensile on the outside (Ivanov, 2008). The fiber core of FBG which is very thin and determines the sensing characteristics locates in the neutral layer when the FBG is bended, so the total loss will not be significant unless the bending curvature is large enough.…”

Section: B Bendingmentioning

confidence: 99%

A comparison study of the sensing characteristics of FBG and TFBG

Jiang

2013

Sensor Review

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Purpose -The purpose of this paper is to compare the sensing characteristics of uniform fiber Bragg grating (FBG) and tilted fiber Bragg grating (TFBG) by presenting a detailed research review. Temperature, axial strain, bending, vibration and refractive index measurands of FBG and TFBG sensor are presented and some significant differences are found. Design/methodology/approach -Theoretical analysis and practical application in engineering are investigated and compared from other authors' research papers and self analysis. Spectra behavior of both FBG and TFBG are discussed. Findings -There are found to be significant differences in temperature, axial strain, bending, vibration and refractive index sensing characteristics of FBG and TFBG. Originality/value -The paper's analysis is comprehensive and clear and provides readers with the sensing characteristics of FBG and TFBG in detail.

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