Degradation of sensing properties of fiber Bragg grating strain sensors in fatigue process of bonding layers

Zhang, Wei; Chen, Weimin; Shu, Yuejie; Wu, Jun; Li, Xiaohua

doi:10.1117/1.oe.53.4.046102

Cited by 12 publications

(4 citation statements)

References 25 publications

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“…However, the existence of the adhesive point and protective coating (if any), converts part of the strain into shear deformation [15][16][17] identified the bonding point as a direct factor which distorts the reflection spectra of FBGs by causing stress birefringence, i.e., change in both the polarisation and direction of propagation of light. [18] further submits that undesirable effects caused primarily by bonding points are present which affect the sensing characteristics of FBG strain sensors especially during their fatigue process. As a result of the crucial role of the bonding point as a strain transfer medium between the machine and the FBG sensor, it has great influence on the optical transmission rate of the latter [19][20][21].…”

Section: Effects Of Bondingmentioning

confidence: 99%

Investigation of the Effect of Bonding Points on Metal Surface-Mounted FBG Sensors for Electric Machines

Alalibo¹,

Cao²,

Gbadebo³

et al. 2019

PIER C

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Fibre Bragg Gratings (FBGs) offer several advantages including their immunity to electromagnetic fields making them excellent in situ sensors for feature extraction in electrical machines condition monitoring. However, the pre-requisite of bonding FBGs circumferentially on either the machine cast frame or stator windings can introduce undesired sensing characteristics. This is because the FBG relies on adhesives as the transfer medium for any sensed parameter between the machine and sensor. Whilst FBG sensors rely mainly on wavelength shift, an intolerably low signal-to-noise ratio will result in difficulty in measuring such shifts. As a complementary signature, differential optical power can be combined with wavelength shift to broaden the feature extraction capability of FBG sensors. This makes power level (dBm) an important sensing parameter for FBG sensors. The effect of varying number of bonding points on transmitted optical power is investigated using unstripped and stripped bare fibres as well as an actual FBG sensor. Increasing the number of bonding points beyond an optimum number has been observed to significantly attenuate the optical signal power level and quality for a given dynamic range. Hence, as the number of bonding points is increased, the level of attenuation should be closely monitored to ensure that the optimum number is not exceeded if excellent and accurate FBG sensing characteristics are to be realised.

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Section: Effects Of Bondingmentioning

confidence: 99%

Investigation of the Effect of Bonding Points on Metal Surface-Mounted FBG Sensors for Electric Machines

Alalibo¹,

Cao²,

Gbadebo³

et al. 2019

PIER C

View full text Add to dashboard Cite

show abstract

“…Innovative solutions, with reliable sensors and embedded electronics, are vital for many automated systems that can feel, adapt, and learn (i.e., intelligent robots). But again, until now, issues such as machine noise [43], signal degradation [44], and dynamic response [45] have not been fully discussed.…”

Section: Introductionmentioning

confidence: 99%

Strain Sensing Technology to Enable Next-Generation Industry and Smart Machines for the Factories of the Future: A Review

Hamed,

O’Donnell,

Lishchenko

et al. 2023

IEEE Sensors J.

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In the era of digitalization, there is a huge focus on capturing data from manufacturing processes and systems. Since the promotion of Industry 4.0, the industrial marketplace has been crowded with solution providers who excel in capturing and aggregating data on the cloud and presenting it on dashboards. From machine states to production targets, this type of data has become more readily available from tools, controllers, switches, and factory bus systems. As the industry pushes deeper into the machine for information and aspires to have smart machines that can feel and react to experiences during the manufacturing process, then more sophisticated technology is necessary. Strain sensor technology is a logical measurement principle to address this challenge for many industrial sectors. For researchers and industrialists to progress toward the smart machine agenda, there must be a firm grasp of the "technology-solution fit," i.e., what strain technology could provide the most appropriate solution. This paper presents a review of the state of the art in strain sensors that are foreseen as frontrunners to enable next-generation smart components and intelligent tools. The review focuses on industrial strain sensing technologies that are at a mature place on the technology readiness levels (TRLs) and present themselves as highly practical solutions for smart components and digitized machines, considering sensitivity, powered or passive, wired or wireless, and robustness. Through this review, researchers and industrialists will have a suite of solutions to move on with their innovative designs of smart machines based on embedded strain sensor technology.

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“…Performance parameters of these sensors are affected by both the materials from which they are made and their geometric design. Some researches focused on fatigue behavior of FBG-based strain sensors [7][8][9][10][11]. To the best of our knowledge, however, no study has been conducted to evaluate the sensors characteristics under fatigue loading at high temperatures.…”

Section: Introductionmentioning

confidence: 99%

Fatigue Behavior of Metal-Packaged Regenerated Fiber Bragg Grating Strain Sensors at High Temperatures: A Preliminary Study

Wang

et al. 2019

KEM

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Regenerated Fiber Bragg grating (RFBG) sensors exhibit tremendous growth in recent years and could be widely used for measuring strains and for structural integrity assessment of components operated at high-temperature if critical issues (fatigue life, interface integrity, etc.) are addressed. For the determination of fatigue life of metal-packaged RFBG strain sensors at high temperatures, tensile fatigue tests are performed on the sensors. The preliminary results show that the sensors exhibit good linearity and repeatability, and rare sensitivity change under cyclic tension loading when exposed to constant high temperature up to 500 °C, without obvious variations in the spectral response. The rupture of the optical fibers is the major cause of fatigue failure of the sensors. The sensors subjected to lower test strain have greater fatigue life. A rapid decrease in Bragg wavelength is observed at the beginning of the fatigue tests followed by stabilization of the Bragg wavelength. These results indicate that the sensors are the promising candidates for health monitoring of structures subjected to cyclic loads at high temperatures.

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Degradation of sensing properties of fiber Bragg grating strain sensors in fatigue process of bonding layers

Cited by 12 publications

References 25 publications

Investigation of the Effect of Bonding Points on Metal Surface-Mounted FBG Sensors for Electric Machines

Investigation of the Effect of Bonding Points on Metal Surface-Mounted FBG Sensors for Electric Machines

Strain Sensing Technology to Enable Next-Generation Industry and Smart Machines for the Factories of the Future: A Review

Fatigue Behavior of Metal-Packaged Regenerated Fiber Bragg Grating Strain Sensors at High Temperatures: A Preliminary Study

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