Analysis of multimode POF gratings in stress and strain sensing applications

Luo, Yanhua; Yan, Binbin; Li, Mo; Zhang, Xiaolei; Wu, Wenxuan; Zhang, Qijin; Peng, Gang-Ding

doi:10.1016/j.yofte.2011.02.005

Cited by 41 publications

(15 citation statements)

References 31 publications

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“…Description n air , n core , n clad Refractive index of air, core, and cladding, resp. R core , R clad Radii of core and cladding p 0 Start point of ray vector x ω,τ p c Ray-to-interface collision point p 1 Ray end position when there is no refractive index change p 1,rfr New position after refraction p 1,tif New position after total internal re ection (TIR) θ 0 Ray incidence angle to interface θ 1,rfr θ 1,tif Ray angle after refraction/TIR (Tables 1 and 2). Fiber diameters were chosen considering the e ciency of weaving process afterwards.…”

Section: Parametermentioning

confidence: 99%

“…e idea of smart textile is to assign additional functionality to garments with IT materials. e new functionality includes not only simple sensing of external environment such as stress/strain [1,2], temperature [3], or humidity [4], but also active response to the environment [5,6]. e most common materials used so far for smart textiles were basically conductive materials.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Ray‐Tracing‐Based Modeling of Clad‐Removed Step‐Index Plastic Optical Fiber in Smart Textiles: Effect of Curvature in Plain Weave Fabric

Moon

Lee

Sul

2018

Advances in Materials Science and Engineering

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Plastic optical fiber was chosen for information delivery media in smart textile. Cladding layer was peeled off by chemical and mechanical methods to find optimal peeling conditions. Both radial side illumination and longitudinal end-tip illumination were measured for visible light of 627 µm wavelength. A half-cone-shaped jig was manufactured using 3D printing to give various curvature conditions to fibers. Also POFs were embedded in plain weave textile structure to measure the light dissipation effect. The waveguide phenomenon was modeled using discrete ray tracing technique and ray-to-interface collision detection algorithm. Results from the proposed modeling technique showed linear relationship with those from experiment.

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Section: Parametermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ray‐Tracing‐Based Modeling of Clad‐Removed Step‐Index Plastic Optical Fiber in Smart Textiles: Effect of Curvature in Plain Weave Fabric

Moon

Lee

Sul

2018

Advances in Materials Science and Engineering

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“…Commercially available POFs have larger core diameters when compared with mPOFs and multimode operation, which leads to POFBGs with multi-wavelength-peak, reflection spectra [22]. In order to limit the adverse effects of this multi-peak behavior, the grating inscription parameters are carefully optimized using fs laser inscription using the plane-by-plane inscription method presented in [23,24], where a single reflection peak was obtained through the control of the core mode excitation.…”

Section: Introductionmentioning

confidence: 99%

Polymer Optical Fiber Bragg Gratings in CYTOP Fibers for Angle Measurement with Dynamic Compensation

et al. 2018

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This paper demonstrates the use of polymer optical fiber Bragg gratings (POFBGs) for angle measurements over a range of different oscillatory frequencies. The POFBGs are inscribed in low-loss, cyclic transparent amorphous fluoropolymers (CYTOP) and are imprinted using the direct-write, plane-by-plane femtosecond laser inscription method. As the polymer has a viscoelastic response and given that the Young’s modulus depends on the oscillatory frequency, a compensation technique for sensor frequency cross-sensitivity and hysteresis is proposed and verified. Results show that the proposed compensation technique is able to provide a root mean squared error (RMSE) reduction of 44%, and a RMSE as low as 2.20° was obtained when compared with a reference potentiometer. The hysteresis reduction provided by the proposed technique is 55%, with hysteresis <0.01. The results presented in this paper can pave the way for movement analysis with POFBG providing higher sensitivity and low hysteresis over a large range of motion frequencies.

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“…Using a 325 nm UV laser, in undoped mPOFs exposure times from 60 to 270 minutes have been reported [19,20], the lowest inscription time reported being approximately 7 minutes [21]. For the step-index fibres the inscription times are shorter and typically around to 45 to 100 minutes [19,22] with the lowest inscription time reported being approximately 20 minutes [13]. The writing times can be reduced by doping the fibre [14], however doped fibres are more difficult and expensive to fabricate, the transmission loss increases and they are less suitable for in-vivo biosensing.…”

Section: Introductionmentioning

confidence: 99%

Impact of thermal pre-treatment on preforms for fast Bragg gratings inscription using undoped PMMA POFs

et al. 2017

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Abstract:In this work, improvements in the photosensitivity of undoped POFs, where there was a welldefined pre-annealing of both preforms in two-step process, were reported. We have noticed that when the primary and secondary preforms are annealed, the fiber photosensitivity is higher; otherwise, if any preform (primary or secondary) is not annealed, the fiber photosensitivity is lower. Two PMMA mPOFs are used where the primary and secondary preforms, during the two-step drawing process, have a different thermal treatment. The PMMA POFs drawn where the primary or secondary preform is not specifically pre-treat need longer inscription time than the fibres drawn where both preforms have been pre-annealed at 80ºC for 2 weeks. Using two different UV lasers, for the latter fibre much less inscription time is needed compared to another homemade POF. The properties of a POF fabricated where there are both preform process with thermal treatment is different from those where just one preform step process is thermal treated, as previously shown in the literature, where these POFs are much less sensitive to thermal treatment. Some important parameters were considered such as drawing tension and water content, where using fibers drawn in different tensions give us a similar FBG inscription time.

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Analysis of multimode POF gratings in stress and strain sensing applications

Cited by 41 publications

References 31 publications

Ray‐Tracing‐Based Modeling of Clad‐Removed Step‐Index Plastic Optical Fiber in Smart Textiles: Effect of Curvature in Plain Weave Fabric

Ray‐Tracing‐Based Modeling of Clad‐Removed Step‐Index Plastic Optical Fiber in Smart Textiles: Effect of Curvature in Plain Weave Fabric

Polymer Optical Fiber Bragg Gratings in CYTOP Fibers for Angle Measurement with Dynamic Compensation

Impact of thermal pre-treatment on preforms for fast Bragg gratings inscription using undoped PMMA POFs

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