Investigation of sensitivity enhancing and temperature compensation for fiber Bragg grating (FBG)-based strain sensor

Li, Ruiya; Tan, Yuegang; Chen, Yiyang; Hong, Liu; Zhou, Zude

doi:10.1016/j.yofte.2019.01.009

Cited by 63 publications

(31 citation statements)

References 19 publications

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“…Both parameters depend on external perturbations, temperature, and strain and therefore by monitoring the shift of the reflected Bragg wavelength, the change of the external perturbation, i.e., temperature or strain, can be monitored. Moreover, since a FBG is sensitive to two measurands, i.e., temperature and strain, two FBGs with different material properties [ 66 ] or packaged on an asymmetric elastic substrate [ 67 ], can be applied to distinguish between the two measurands and thus to compensate for this inherent cross-sensitivity.…”

Section: Fiber Optic Sensors (Foss) For the Shm Of Concrete Structuresmentioning

confidence: 99%

Fiber Optic Sensors Embedded in Textile-Reinforced Concrete for Smart Structural Health Monitoring: A Review

Alwis

Bremer

Roth

2021

Sensors

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The last decade has seen rapid developments in the areas of carbon fiber technology, additive manufacturing technology, sensor engineering, i.e., wearables, and new structural reinforcement techniques. These developments, although from different areas, have collectively paved way for concrete structures with non-corrosive reinforcement and in-built sensors. Therefore, the purpose of this effort is to bridge the gap between civil engineering and sensor engineering communities through an overview on the up-to-date technological advances in both sectors, with a special focus on textile reinforced concrete embedded with fiber optic sensors. The introduction section highlights the importance of reducing the carbon footprint resulting from the building industry and how this could be effectively achieved by the use of state-of-the-art reinforcement techniques. Added to these benefits would be the implementations on infrastructure monitoring for the safe operation of structures through their entire lifespan by utilizing sensors, specifically, fiber optic sensors. The paper presents an extensive description on fiber optic sensor engineering that enables the incorporation of sensors into the reinforcement mechanism of a structure at its manufacturing stage, enabling effective monitoring and a wider range of capabilities when compared to conventional means of structural health monitoring. In future, these developments, when combined with artificial intelligence concepts, will lead to distributed sensor networks for smart monitoring applications, particularly enabling such distributed networks to be implemented/embedded at their manufacturing stage.

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Section: Fiber Optic Sensors (Foss) For the Shm Of Concrete Structuresmentioning

confidence: 99%

Fiber Optic Sensors Embedded in Textile-Reinforced Concrete for Smart Structural Health Monitoring: A Review

Alwis

Bremer

Roth

2021

Sensors

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“…The linear temperature compensation of the monitoring data has proven to be necessary to detect whether damage is present or not based on the measured dynamic or static characteristics of a monitored system [13]. Moreover, our approach is similar to that which is currently used for the temperature compensation of the sensor response [39,[42][43][44], rather than the structural response. Indeed, the response of sensors is also sensible to temperature variation; therefore, sensor measurements must compensate for temperature effects before being used for structural assessment.…”

Section: Proposed Approach Vs Previous Studiesmentioning

confidence: 99%

Designing a Structural Health Monitoring System Accounting for Temperature Compensation

et al. 2021

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Structural health monitoring is effective if it allows us to identify the condition state of a structure with an appropriate level of confidence. The estimation of the uncertainty of the condition state is relatively straightforward a posteriori, i.e., when monitoring data are available. However, monitoring observations are not available when designing a monitoring system; therefore, the expected uncertainty must be estimated beforehand. This paper proposes a framework to evaluate the effectiveness of a monitoring system accounting for temperature compensation. This method is applied to the design process of a structural health monitoring system for civil infrastructure. In particular, the focus is on the condition-state parameters representing the structural long-term response trend, e.g., due to creep and shrinkage effects, and the tension losses in prestressed concrete bridges. The result is a simple-to-use equation that estimates the expected uncertainty of a long-term response trend of temperature-compensated response measurements in the design phase. The equation shows that the condition-state uncertainty is affected by the measurement and model uncertainties, the start date and duration of the monitoring activity, and the sampling frequency. We validated our approach on a real-life case study: the Colle Isarco viaduct. We verified whether the pre-posterior estimation of expected uncertainty, performed with the experimented approach, is consistent with the real uncertainty estimated a posteriori based on the monitoring data.

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“…By embedding a FBG sensor that has been recalibrated at cryogenic temperatures into the cement-based materials, the thermal strain of which and the factors affecting it could be effectively monitored under cryogenic temperatures for its freeze-thaw cycles [23]. Li et al [24] proposed a novel method and relevant mechanical configurations to enhance the strain sensitivity and realize temperature compensation simultaneously for FBG-based strain sensor. The sensor developed by aforementioned authors can be used for long-term small-amplitude micro-strain monitoring in varying temperature environments.…”

Section: Introductionmentioning

confidence: 99%

Strain Conditions Monitoring on Corroded Prestressed Steel Strands in Beams Based on Fiber Bragg Grating Sensors

Fan

Lin

et al. 2020

Sensors

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Fiber Bragg Grating (FBG) sensors, with excellent properties, have been widely adopted to monitor the mechanical parameters in civil engineering in recent years. On the other hand, the current study on fatigue performance of corroded prestressed steel strands is still limited, and this is mainly because the long-term strain conditions monitoring is difficult to conduct. Based on the aforementioned considerations, a total of six beam specimens were fabricated in this study. The loading mode of four points bending was adopted in the form of sinusoidal waves in the experiments. On basis of the experimental results, it can be concluded that the fatigue life of the beam decreases sharply with the increase of the corrosion rate of steel strands. Besides, with the increase of the maximum fatigue load, the fatigue life of the beam will decrease significantly. Furthermore, the existing fatigue damage of steel strand inside the beam before corrosion may further accelerate its fatigue failure. As a result, the fatigue life of the beam is reduced because of the stress concentration. Under the same external load, the strain increment and the residual strain of steel strands in the stages of loading and unloading after corrosion increase significantly compared with other stages, while the existing residual strain always shows an increasing trend at various static loading stages. Therefore, the corrosion of steel strand seriously affects not only its mechanical properties, but also its fatigue performance. Finally, the FBG sensors are capable of measuring the steel strand strain, as well as the long-term strain conditions.

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Investigation of sensitivity enhancing and temperature compensation for fiber Bragg grating (FBG)-based strain sensor

Cited by 63 publications

References 19 publications

Fiber Optic Sensors Embedded in Textile-Reinforced Concrete for Smart Structural Health Monitoring: A Review

Fiber Optic Sensors Embedded in Textile-Reinforced Concrete for Smart Structural Health Monitoring: A Review

Designing a Structural Health Monitoring System Accounting for Temperature Compensation

Strain Conditions Monitoring on Corroded Prestressed Steel Strands in Beams Based on Fiber Bragg Grating Sensors

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