Carbon Cantilever Beam Health Inspection Using a Polymer Fiber Bragg Grating Array

Theodosiou, Antreas; Komodromos, Michael; Kalli, Kyriacos

doi:10.1109/jlt.2017.2768414

Cited by 57 publications

(30 citation statements)

References 24 publications

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“…A 30 min’ stabilization time was given in each step to ensure thermal equilibrium. The mean thermal sensitivity of the CYTOP POFBGs is 18.42 ± 0.45 pm/°C, which is in agreement with [ 9 ].…”

Section: Pofbg-embedded Insole Production and Characterizationsupporting

confidence: 89%

“…These advantages include compactness, lightweight, data multiplexing capabilities, electrical isolation, electromagnetic field immunity, and biocompatibility [ 1 , 2 ]. For these reasons, optical fibers sensors have been used in medical applications, structural health monitoring, and industrial applications to measure parameters such as temperature [ 3 ], strain [ 4 ], humidity [ 5 ], refractive index [ 6 ], and pressure [ 7 ], among other physical quantities [ 8 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

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POFBG-Embedded Cork Insole for Plantar Pressure Monitoring

Vilarinho

Theodosiou

Leitão

et al. 2017

Sensors

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We propose a novel polymer optical fiber (POF) sensing system based on fiber Bragg gratings (FBGs) to measure foot plantar pressure. The plantar pressure signals are detected by five FBGs, in the same piece of cyclic transparent optical polymer (CYTOP) fiber, which are embedded in a cork insole for the dynamic monitoring of gait. The calibration and measurements performed with the suggested system are presented, and the results obtained demonstrate the accuracy and reliability of the sensing platform to monitor the foot plantar pressure distribution during gait motion and the application of pressure. This architecture does not compromise the patient’s mobility nor interfere in their daily activities. The results using the CYTOP fiber showed a very good response when compared with solutions using silica optical fibers, resulting in a sensitivity almost twice as high, with excellent repeatability and ease of handling. The advantages of POF (e.g., high flexibility and robustness) proved that this is a viable solution for this type of application, since POF’s high fracture toughness enables its application in monitoring patients with higher body mass compared with similar systems based on silica fiber. This study has demonstrated the viability of the proposed system based on POF technology as a useful alternative for plantar pressure detection systems.

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Section: Pofbg-embedded Insole Production and Characterizationsupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

POFBG-Embedded Cork Insole for Plantar Pressure Monitoring

Vilarinho

Theodosiou

Leitão

et al. 2017

Sensors

Self Cite

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“…Such a technique allows the direct inscription of the FBG in the fiber core, where an inscription time of 2.5 s was obtained. In addition, the fs laser is employed on the POFBG inscription in CYTOP fibers, which presents lower optical losses in the 1550 nm region than other POFs [10]. For this reason, in 2015, a POFBG was inscribed in CYTOPs fibers both by point-by-point and line-by-line techniques [34].…”

Section: State-of-the-art Of Femtosecond Laser Inscriptionmentioning

confidence: 99%

“…Since then, the characteristics of POFs, such as the high elastic limit, have been used for the production of high tunable lasers [7] and strain sensors with a high elastic limit [8]. In fact, POFBGs have been applied in several engineering areas, like biomedical [9], civil [10], and biological and chemical [11] spheres. In addition, the fabricated POFBGs can find different sensing applications, such as the capability to measure strain [12], temperature [13], humidity [14], pressure [15], liquid level [16], acceleration [17], and the refractive index [11].…”

Section: Introductionmentioning

confidence: 99%

Advances on Polymer Optical Fiber Gratings Using a KrF Pulsed Laser System Operating at 248 nm

Marques

Leal‐Junior

Min

et al. 2018

Fibers

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This paper presents the achievements and progress made on the polymer optical fiber (POF) gratings inscription in different types of Fiber Bragg Gratings (FBGs) and long period gratings (LPGs). Since the first demonstration of POFBGs in 1999, significant progress has been made where the inscription times that were higher than 1 h have been reduced to 15 ns with the application of the krypton fluoride (KrF) pulsed laser operating at 248 nm and thermal treatments such as the pre-annealing of fibers. In addition, the application of dopants such as benzyl dimethyl ketal (BDK) has provided a significant decrease of the fiber inscription time. Furthermore, such improvements lead to the possibility of inscribing POF gratings in 850 nm and 600 nm, instead of only the 1550 nm region. The progress on the inscription of different types of polymer optical fiber Bragg gratings (POFBGs) such as chirped POFBGs and phase-shifted POFBGs are also reported in this review.

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“…Also, the refractive index changes introduced by the fs pulses are highly localized. From the first FBG inscription in CYTOP POF with fs laser reported [5], the same group has published a considerable number of works with focus in sensing applications at 1550 nm spectral region [10][11][12][13]. Due to point-by-point or plane-by-plane method limitation, the fs pulses irradiation is limited to typical periods of FBGs, due to the spatial resolution is limited by the diffraction limit [14].…”

Section: Introductionmentioning

confidence: 99%