Highly Sensitive Bend Sensor Based on Bragg Grating in Eccentric Core Polymer Fiber

Chen, Xianfeng F.; Zhang, Chi; Webb, David J.; Kalli, Kyriacos; Peng, Gang-Ding

doi:10.1109/lpt.2010.2046482

Cited by 135 publications

(52 citation statements)

References 18 publications

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“…In [10], a superstructure fiber Bragg grating is used to simultaneously measure strain and curvature. Other Bragg grating sensors have demonstrated evolving levels of sophistication, such as the capabil- ity to determine bend direction [11], [12], [13], integration of flexible materials such as elastomers [14] and polymer optical fiber [15], self-alignment [16], simultaneous temperature measurement [17] and general increased sensitivity [18]. Despite high bend sensitivity, fiber Bragg gratings exhibit several disadvantages as curvature sensors, including measurement in reflection only or transmission only (for long-period gratings), broad resonant wavelengths that limit measurement accuracy, and strain-induced failure due to noncompliant materials.…”

Section: A Previous Workmentioning

confidence: 99%

Soft curvature sensors for joint angle proprioception

Kramer¹,

Majidi²,

Sahai³

et al. 2011

2011 IEEE/RSJ International Conference on Intelligent Robots and Systems

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Abstract-We introduce a curvature sensor composed of a thin, transparent elastomer film (polydimethylsiloxane, PDMS) embedded with a microchannel of conductive liquid (eutectic Gallium Indium, eGaIn) and a sensing element. Bending the sensor exerts pressure on the embedded microchannel via the sensing element. Deformation of the cross-section of the microchannel leads to a change in electrical resistance. We demonstrate the functionality of the sensor through testing on a finger joint. The film is wrapped around a finger with the sensing element positioned on top of the knuckle. Finger bending both stretches the elastomer and exerts pressure on the sensing element, leading to an enhanced change in the electrical resistance. Because the sensor is soft (elastic modulus E ∼ 1 MPa) and stretchable (>350%), it conforms to the host bending without interfering with the natural mechanics of motion. This sensor represents the first use of liquid-embedded elastomer electronics to monitor human or robotic motion.

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Section: A Previous Workmentioning

confidence: 99%

Soft curvature sensors for joint angle proprioception

Kramer¹,

Majidi²,

Sahai³

et al. 2011

2011 IEEE/RSJ International Conference on Intelligent Robots and Systems

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“…38 This type of utilization of FBGs has not yet, to our knowledge, been implemented in wind turbine applications. Bend sensors in polymer optical fibers based on FBGs have been demonstrated by Chen et al 39,40 However, polymer optical fibers are more fragile and sensitive to mechanical exhaustion than typical silica optical fibers, and therefore they are not preferred for applications in wind turbines.…”

Section: Fiber-bragg Gratings As Wind Turbine Load Sensorsmentioning

confidence: 99%

Fiber-optical grating sensors for wind turbine blades: a review

Glavind¹,

Olesen²,

Skipper³

et al. 2013

Opt. Eng

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Abstract. With the rapid growth of wind turbines and focus on maintenance costs structural measurements are becoming essential. Fiberoptical sensors have physical properties that make them suitable for embedding in wind turbine blades, such as small size and immunity to electrical interferences. Fiber-optical grating sensors can be utilized to provide important information regarding strain, temperature, and curvature of the blades, which can be applied in condition-monitoring to detect fatigue failure and furthermore for optimization of the production from the wind turbine. We provide an overview of the current status and a discussion on research and implementation of fiber Bragg gratings and long-period gratings in wind turbine blade sensors. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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“…Due to its unique properties, PMMA has become one of the most common polymers used for the fabrication of gratings and waveguides. PMMA-based optical fiber Bragg gratings (POFBGs) were found to be sensitive to relative humidity, temperature, strain and pressure with high sensitivity [8][9][10][11]. The sensing response time of POFBGs can be significantly improved either by reducing the fiber diameter with chemical etching [9] or by spatial modification of fiber geometry using laser micromachining [12].…”

Section: Introductionmentioning

confidence: 99%

Characterization of Polymer Fiber Bragg Grating With Ultrafast Laser Micromachining

Liu

Cardoso²,

Zhang

et al. 2016

IEEE Photon. Technol. Lett.

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Abstract-We report that the main photosensitive mechanism of poly(methyl methacrylate)-based optical fiber Bragg grating (POFBG) under ultraviolet laser micromachining is a complex process of both photodegradation and negative thermo-optic effect. We found experimentally the unique characteristics of Bragg resonances splitting and reunion during laser micromachining process providing evidence of photodegradation while the mean refractive index change of POFBG was measured to be negative confirming further photodegradation of polymer fiber. The thermal-induced refractive index change of POFBG was also observed by recording the Bragg wavelength shift. Furthermore the dynamic thermal response of the micromachined-POFBG was demonstrated under constant humidity, showing a linear and negative response of around -47.1 pm/°C.

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Highly Sensitive Bend Sensor Based on Bragg Grating in Eccentric Core Polymer Fiber

Abstract: We report on an optical bend sensor based on a Bragg grating inscribed in an eccentric core polymer optical fiber. The device exhibits the strong fiber orientation dependence, the wide bend curvature range of ± 22.7 m-1 and high bend sensitivity of 63 pm/m-1 .

Cited by 135 publications

References 18 publications

Soft curvature sensors for joint angle proprioception

Soft curvature sensors for joint angle proprioception

Fiber-optical grating sensors for wind turbine blades: a review

Characterization of Polymer Fiber Bragg Grating With Ultrafast Laser Micromachining

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