Fiber Optic Shape Sensors: A comprehensive review

Floris, Ignazio; Adam, José M.; Calderón, Pedro A.; Sales, Salvador

doi:10.1016/j.optlaseng.2020.106508

Cited by 156 publications

(50 citation statements)

References 150 publications

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“…Fiber-optic sensors (FOSs) are extremely suitable for such purposes. This innovative technology, extremely sensitive to temperature and strain variations [ 3 ], has been developed rapidly in recent decades [ 4 ] thanks to a multitude of cutting-edge advantages [ 5 ]. In particular, fiber Bragg gratings (FBGs) are by far the most widely used FOS [ 6 ] by virtue of their cost-effectiveness [ 7 ].…”

Section: Introductionmentioning

confidence: 99%

Fiber Bragg Grating Sensors for Underwater Vibration Measurement: Potential Hydropower Applications

Torre

Floris

Sales

et al. 2021

Sensors

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The present paper assesses the performance and characteristics of fiber Bragg grating sensors, with a special interest in their applications in hydraulic machinery and systems. The hydropower industry is turning to this technology with high expectations of obtaining high quality data to validate and calibrate numerical models that could be used as digital twins of key assets, further strengthening the sector’s relevant position within industry 4.0. Prior to any validation, fiber Bragg grating sensors’ ability to perform well underwater for long periods of time with minimal degradation, and their ease of scalability, drew the authors´ attention. A simplified modal analysis of a partially submerged beam is proposed here as a first step to validate the potential of this type of technology for hydropower applications. Fiber Bragg grating sensors are used to obtain the beam’s natural frequencies and to damp vibrations under different conditions. The results are compared with more established waterproof electric strain gauges and a laser vibrometer with good agreement. The presence of several sensors in a single fiber ensures high spatial resolution, fundamental to precisely determine vibration patterns, which is a main concern in this industry. In this work, the beam’s vibration patterns have been successfully captured under different excitations and conditions.

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Section: Introductionmentioning

confidence: 99%

Fiber Bragg Grating Sensors for Underwater Vibration Measurement: Potential Hydropower Applications

Torre

Floris

Sales

et al. 2021

Sensors

Self Cite

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“…In recent years, a wide range of Structural Health Monitoring (SHM) techniques based on integrated sensors and optimized signal processing algorithms have been developed to assess the presence of impact damage in composite structures. In this context, guided ultrasonic waves can offer a valuable solution, making it possible to inspect large structures and components with relatively few sensors [3][4][5]. Coherence function drops, harmonic distortion, and singularities in the Holder exponent were also applied to identify the damage signature in the system response [6].…”

Section: Introductionmentioning

confidence: 99%

Impact Damage Detection in Composite Beams by Analysis of Non-Linearity under Pulse Excitation

2021

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To detect the presence of damage, many structural health monitoring techniques exploit the nonlinear features that typically affect the otherwise linear dynamic response of structural components with internal defects. One of them is the Scaling Subtraction Method (SSM), which evaluates nonlinear features of the response to a high-amplitude harmonic excitation by subtracting a scaled reference signal. Originally tested on granular materials, the SSM was shown to be effective for composite materials as well. However, the dependence of the technique efficiency on the testing frequency, usually selected among the natural frequencies of the system, may limit its application in practice. This paper investigates the feasibility of applying the SSM through a broadband impulsive excitation, which would avoid the need of a preliminary modal analysis and address the issue of the proper selection of the excitation frequency. A laminated composite beam was tested in intact and damaged conditions under both scaled harmonic excitations of different frequency and broadband impulsive signals of scaled amplitude. Two damage indicators working on the frequency domain were introduced. The results showed a good sensitivity of the SSM to the presence and level of impact damage in composite beams when applied through a broadband impulsive excitation.

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“…In recent years, optical fiber sensors have attracted increased interest in aerospace [1], industrial manufacturing [2], medical [3] and other fields, since they offer the advantages of small volume, simple structure, high sensitivity, electromagnetic interference resistance and anti-corrosion properties [4]. In addition, dual-parameter sensors or multi-parameter sensors have been developed and many studies have focused on solving the cross-sensitivity issue [5].…”

Section: Introductionmentioning

confidence: 99%

A Fiber Ring Laser Sensor with a Side Polished Evanescent Enhanced Fiber for Highly Sensitive Temperature Measurement

et al. 2021

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We demonstrate a highly sensitive and practical fiber-based temperature sensor system. The sensor is constructed based on a fiber ring laser (FRL) as well as a side-polished fiber filled with isopropanol. The laser cavity of the sensing part fiber is polished by the wheel fiber polishing system with residual thickness (RT) is selected to detect the temperature in the FRL. Thanks to the high thermo-optic coefficient of isopropanol, the sensitivity of the proposed temperature sensor could be effectively improved by filling isopropanol in the cost-less side polished single mode fiber. Refractive index (RI) of isopropanol changes with the surrounding temperature variation allowing high-sensitivity temperature sensing. Experimental results demonstrate that the side polished fiber can efficiently excite high-order cladding modes which enhance the modular interference increase the interaction between the evanescent wave and the isopropanol. Besides, the results show that the sensitivity can be as high as 2 nm/°C in the temperature range of 25 °C–35°C.

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Fiber Optic Shape Sensors: A comprehensive review

Cited by 156 publications

References 150 publications

Fiber Bragg Grating Sensors for Underwater Vibration Measurement: Potential Hydropower Applications

Fiber Bragg Grating Sensors for Underwater Vibration Measurement: Potential Hydropower Applications

Impact Damage Detection in Composite Beams by Analysis of Non-Linearity under Pulse Excitation

A Fiber Ring Laser Sensor with a Side Polished Evanescent Enhanced Fiber for Highly Sensitive Temperature Measurement

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