Selection and Characterization of Packaged FBG Sensors for Offshore Applications

Wu, Lei; Maheshwari, Muneesh; Yang, Yue; Xiao, Wensheng

doi:10.3390/s18113963

Cited by 20 publications

(11 citation statements)

References 41 publications

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“…Of the transmitted light, the grating will only return the reflected light. [19]. In this type of sensor, the grating is inserted into the core of the optical fiber (OF), as shown in a signal where the wavelength filtering is done by such a sensor.…”

Section: Fiber Bragg Gratings (Fbgs)mentioning

confidence: 99%

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Fiber Optic Sensors for Vital Signs Monitoring. A Review of Its Practicality in the Health Field

et al. 2021

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Vital signs not only reflect essential functions of the human body but also symptoms of a more serious problem within the anatomy; they are well used for physical monitoring, caloric expenditure, and performance before a possible symptom of a massive failure—a great variety of possibilities that together form a first line of basic diagnosis and follow-up on the health and general condition of a person. This review includes a brief theory about fiber optic sensors’ operation and summarizes many research works carried out with them in which their operation and effectiveness are promoted to register some vital sign(s) as a possibility for their use in the medical, health care, and life support fields. The review presents methods and techniques to improve sensitivity in monitoring vital signs, such as the use of doping agents or coatings for optical fiber (OF) that provide stability and resistance to the external factors from which they must be protected in in vivo situations. It has been observed that most of these sensors work with single-mode optical fibers (SMF) in a spectral range of 1550 nm, while only some work in the visible spectrum (Vis); the vast majority, operate through fiber Bragg gratings (FBG), long-period fiber gratings (LPFG), and interferometers. These sensors have brought great advances to the measurement of vital signs, especially with regard to respiratory rate; however, many express the possibility of monitoring other vital signs through mathematical calculations, algorithms, or auxiliary devices. Their advantages due to miniaturization, immunity to electromagnetic interference, and the absence of a power source makes them truly desirable for everyday use at all times.

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Section: Fiber Bragg Gratings (Fbgs)mentioning

confidence: 99%

“…Reproduced from Refs. [ 19 , 25 , 28 , 32 , 39 , 40 , 56 , 85 , 94 , 95 , 96 , 106 , 107 ] Sensors Journal, Materials Journal, Applied Sciences Journal, Fibers Journal and Journal of Functional Biomaterials of the MDPI. Reproduced from Refs.…”

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confidence: 99%

Fiber Optic Sensors for Vital Signs Monitoring. A Review of Its Practicality in the Health Field

et al. 2021

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“…FBG is a periodic modulation of the index of refraction, which is inscribed into the core of a single-mode optical fiber [37]. Essentially, it works as a wavelength filter [38]. When a broadband light source is injected into the fiber, the FBG reflects a narrowband portion of the incident light with a specific wavelength, while the rest portion of the broadband light passes through, as shown in Figure 4.…”

Section: Fbg Strain Sensormentioning

confidence: 99%

“…The fixing between FBG sensors and test points is realized by commercial adhesive (Structural Epoxy Adhesives DG-4). In order to prevent the FBG from breaking during the testing, secondary coating protection with acrylate material was employed after the grating was inscribed into the core of the optical fiber [38,42]. The coating is a layer of film with the same size with the original coating, that is, the outer diameter of 0.25 mm and the inner diameter of 0.125 mm.…”

Section: Position Of Testing Pointsmentioning

confidence: 99%

Fiber Bragg Gratings Based Cyclic Strain Measuring of Weld Toes of Cruciform Joints

Wei¹,

Li²,

Guo³

et al. 2019

Applied Sciences

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The real weld toe geometry is generally not mathematically perfect, resulting in obvious stress concentration effects, both on the weld section and along the longitudinal direction of the weld toe. The true stress-strain state at the local weld toe directly affects the fatigue performance and behavior of the welded structure. Therefore, a Fiber Bragg Grating (FBG) sensor based method for testing the cyclic strain at the weld toe was proposed. Cruciform welded joints were fabricated as specimens on which FBG sensors were arranged at several characteristic points along the weld toe curve. Strains at all the characteristic points under cyclic tensile load were measured and recorded, which showed the proposed measuring method could accurately obtain the complete local strain time histories along the weld toe. The strain time histories clearly reflected the cyclic hardening phenomenon in the early stage and the plastic yielding phenomenon in the final stage. Furthermore, based on the cyclic stress-strain constitutive model of the weld material, the stress-strain response curves of all the characteristic points were drawn. Combined with the fatigue fracture morphology, the mechanism of the unsynchronized initiation of the multiple cracks in the weld toe was investigated.

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“…Conventional FOSs used for SHM have been mainly grating-based and require adequate attachment of the sensor region to the structure. This had been mainly achieved using binding agents, such as epoxy [16,17]. The installation of such a sensing scheme not only requires specialist trained personnel in fiber optics to carry out the installation, but also, the accuracy of the sensing mechanism relies heavily on the efficiency of the intermediate transfer agent, i.e., epoxy.…”

Section: Introductionmentioning

confidence: 99%

Durability of Functionalized Carbon Structures with Optical Fiber Sensors in a Highly Alkaline Concrete Environment

et al. 2019

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The paper presents an investigation into the durability of functionalized carbon structures (FCS) in a highly alkaline concrete environment. First, the suitability of optical fibers with different coatings-i.e., acrylate, polyimide, or carbon-for the FCS was investigated by subjecting fibers with different coatings to micro/macro bending and a 5% sodium hydroxide (NaOH) (pH 14) solution. Then, the complete FCS was also subjected to a 5% NaOH solution. Finally, the effects of spatial variation of the fiber embedded in the FCS and the bonding strength between the fiber and FCS was evaluated using different configurations -i.e., fiber integrated into FCS in a straight line and/or with offsets. All three coatings passed the micro/macro bending tests and show degradation after alkaline exposure, with the carbon coating showing least degradation. The FCS showed relative stability after exposure to 5% NaOH. The optimum bonding length between the optical fiber and the carbon filament was found to be ≥150 mm for adequate sensitivity.

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Selection and Characterization of Packaged FBG Sensors for Offshore Applications

Cited by 20 publications

References 41 publications

Fiber Optic Sensors for Vital Signs Monitoring. A Review of Its Practicality in the Health Field

Fiber Optic Sensors for Vital Signs Monitoring. A Review of Its Practicality in the Health Field

Fiber Bragg Gratings Based Cyclic Strain Measuring of Weld Toes of Cruciform Joints

Durability of Functionalized Carbon Structures with Optical Fiber Sensors in a Highly Alkaline Concrete Environment

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