Efficient design of Fiber Optic Polarimetric Sensors for crack location and sizing

Maheshwari, Muneesh; Tjin, Swee Chuan; Asundi, Anand

doi:10.1016/j.optlastec.2014.11.023

Cited by 9 publications

(5 citation statements)

References 14 publications

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“…The increased strain due to the damage or crack in a structure is picked up by FOPS irrespective of the damage location in the structure. Thus, FOPS monitors damages in different structures globally [14][15][16]. However, the location of the damage might not be achieved using FOPS.…”

Section: Introductionmentioning

confidence: 99%

Crack monitoring using multiple smart materials; fiber-optic sensors & piezo sensors

Maheshwari

Annamdas

Pang

et al. 2017

International Journal of Smart and Nano Materials

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This article focuses on health monitoring of structures using multiple smart materials. In this research, two fiber-optic sensors, namely fiber Bragg grating (FBG) and fiber-optic polarimetric sensor (FOPS), are investigated for damage detection in the beam specimen. FBG is used for local strain measurement while FOPS is used for global strain measurement. Both FBG and FOPS show significant changes in the strain due to damages in the specimen. Also, at the center of the specimen, piezoelectric wafer active sensor (PWAS) is attached. The electromechanical admittance (EMA) signature of the specimen beam is recorded by PWAS. The changes in the amplitudes of the peaks obtained at various frequencies in this EMA signature are analyzed, and it is shown that the peak amplitudes respond differently to damages and to change in loading. Thus, multiple smart materials (FBG, FOPS, and PWAS) are used to get improved information on the health of the beam. KEYWORDSFiber-optic polarimetric sensor (FOPS); fiber Bragg grating (FBG); piezoelectric wafer active sensor (PWAS); crack/damage monitoring

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Section: Introductionmentioning

confidence: 99%

Crack monitoring using multiple smart materials; fiber-optic sensors & piezo sensors

Maheshwari

Annamdas

Pang

et al. 2017

International Journal of Smart and Nano Materials

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“…Therefore, it is significant to determine the characteristics of HOI brought by multiple perturbation points in PMF. The traditional analysis methods for the polarization light transmission through polarization devices based on Jones matrix [ 15 ] or Mueller matrix [ 16 ] are also applicable to HOI. However, the computation will become extremely complex with the number increase of coupling points by these methods.…”

Section: Introductionmentioning

confidence: 99%

High-Order Interference Effect Introduced by Polarization Mode Coupling in Polarization—Maintaining Fiber and Its Identification

Yang

et al. 2016

Sensors

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The high-order interference (HOI)—The interferogram introduced by polarization mode couplings (PMC) of multiple perturbations—Will cause misjudgment of the realistic coupling points in polarization-maintaining fiber (PMF) which is tested with a white light interferometer (WLI) with large dynamic range. We present an optical path tracking (OPT) method for simplifying the analysis of HOI, and demonstrate the enhancement and suppression conditions for the HOIs. A strategy is proposed to readily identify HOI by altering the spliced angle between polarizers’ pigtails and the PMF under test. Moreover, a PMF experiment with two perturbation points, for simplicity, is given as an example. As a result, all the characteristic interferograms including HOIs can be distinguished through just four measurements. Utilizing this identification method, we can estimate the realistic coupling points in PMFs and distinguish them from the interference signals including numerous HOIs.

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“…FOPS perform global health monitoring of structures through analysis of the state of polarization (SOP). 9,10 FOPS point out the presence of damage only, with no specific information about the damage size or damage site. Hence, a combination of FBG and FOPS are well suited for obtaining local and global SHM information.…”

Section: Introductionmentioning

confidence: 99%

Combined fiber Bragg grating and fiber optic polarimetric sensors on a single fiber for structural health monitoring of two-dimensional structures

Maheshwari

Tjin

Asundi

2016

Structural Health Monitoring

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Fiber optic sensors have a lot to offer in the field of structural health monitoring. The most widely investigated and implemented fiber optic sensors for structural health monitoring are fiber Bragg grating and fiber optic polarimetric sensor. Fiber Bragg grating sensors provide localized strain data, thereby providing local damage information, while fiber optic polarimetric sensors are known for their capabilities of global damage monitoring for both static and dynamic loadings. However, each sensor has to be used with its own instrumentation and processing system. In this article, it is shown that an fiber Bragg grating written on a polarizing maintaining fiber can discern information from both fiber Bragg grating and fiber optic polarimetric sensors using only one decoding system. This reduces costs and complexities. Furthermore, by proper multiplexing the polarizing maintaining-fiber Bragg grating sensor, it is possible to predict the damage location in plates. The results demonstrate that the damage site can be located in two-dimensional structures using this multiplexed sensing array.

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Efficient design of Fiber Optic Polarimetric Sensors for crack location and sizing

Cited by 9 publications

References 14 publications

Crack monitoring using multiple smart materials; fiber-optic sensors & piezo sensors

Crack monitoring using multiple smart materials; fiber-optic sensors & piezo sensors

High-Order Interference Effect Introduced by Polarization Mode Coupling in Polarization—Maintaining Fiber and Its Identification

Combined fiber Bragg grating and fiber optic polarimetric sensors on a single fiber for structural health monitoring of two-dimensional structures

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