Conception and realization of an angular optical sensor

Cherbi, L.; Mehenni, M.; Aksas, R.

doi:10.1002/mop.20015

Cited by 11 publications

(6 citation statements)

References 4 publications

(3 reference statements)

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“…Preliminary results revealed that such setup was feasible for a monitoring joint angular motion sensor. Two other studies showed an angle sensor whose operating principle was based on the intensity variation of the optical signal propagated through the fiber when subjected to macrobending [ 94 , 95 ]. Despite the positive results, these works had some limitations.…”

Section: Applicationsmentioning

confidence: 99%

Optical Sensors Based on Plastic Fibers

Bilro

Alberto

Pinto

et al. 2012

Sensors

313

131

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The recent advances of polymer technology allowed the introduction of plastic optical fiber in sensor design. The advantages of optical metrology with plastic optical fiber have attracted the attention of the scientific community, as they allow the development of low-cost or cost competitive systems compared with conventional technologies. In this paper, the current state of the art of plastic optical fiber technology will be reviewed, namely its main characteristics and sensing advantages. Several measurement techniques will be described, with a strong focus on interrogation approaches based on intensity variation in transmission and reflection. The potential applications involving structural health monitoring, medicine, environment and the biological and chemical area are also presented.

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Section: Applicationsmentioning

confidence: 99%

Optical Sensors Based on Plastic Fibers

Bilro

Alberto

Pinto

et al. 2012

Sensors

313

131

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“…In reality, in comparison with these electrical counterparts, fiber-optic sensors are increasingly used for human joint monitoring, because of the advantages of small size, light weight, flexibility, versatility and immunity to external electromagnetic interference [14]. Moreover, compared with the fabricated electrical fibers in reference [13], optical fibers can be more easily achieved by a controllable machining process.…”

Section: Introductionmentioning

confidence: 99%

“…However, these conventional POF sensors usually demonstrate low bending sensitivity, especially at lower bending deformation, regardless of the fluctuations in detected power. According to previously published work [14], these external power disturbances related to intensity-based sensors can be compensated for, nonetheless, by various intensity referencing schemes. In order to enhance the sensitivity of a bent POF sensor, a simple side-polishing method is generally adapted, because the mechanical resistance of the fiber allows an easy removal of a portion of the jacket, cladding and core [23].…”

Section: Introductionmentioning

confidence: 99%

Wearable Wrist Movement Monitoring Using Dual Surface-Treated Plastic Optical Fibers

Liu

et al. 2020

Materials

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Regarding high-sensitivity human wrist joint motion monitoring in exercise rehabilitation; we develop a pair of novel wearable and sensitivity-enhanced plastic optical fiber (POF) strain sensors consisting of an etched grating fiber and a side-polished fiber stitched into a polyamide wrist brace. The two flexible and surface-treated fibers are; respectively; featured with an etched periodic gratings with a pitch of 6 mm and a depth of 0.5 mm and a D-shaped side-polished zone of ~300 µm depth and ~30 mm length; which, correspondingly, show the sensitivities of around 0.0176/° and 0.0167/° in a normalized bending angle by far larger than a conventional commercial POF, because it achieves a more sensitive strain-induced evanescent field interaction with the side-machined fibers. Moreover, in terms of the sensor response to bending deformation in the range of −40°~+40°, the former exhibits a better sensitivity in lower angle change, while the latter is superior as the bending angle increases; thereby arranging the two modified POFs separately at the side and back of the human wrist, in order to decouple the wrist joint behaviors induced by typical flexion-extension or abduction-adduction movements. Then, the circular and pentagonal wrist motion trajectory patterns are investigated, to demonstrate the maximum average single-axis motion error of 2.94° via the transformation of spatial angle to plane coordinate for the fabricated couple of POF sensors, which is lower than a recognized standard of 5°, thus suggesting the great potential in wearable exercise rehabilitation of human joints in the field of medical treatment and healing.

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“…Optical fibers are wrapped around the body, and light loss occurs due to a change in the curvature radius of the optical fiber when the joint angle increases. The change in the joint angle can be indirectly measured by the loss of light intensity [24][25]. This type of sensor has a small measurement range and is difficult to adapt to large joint motion [25].…”

Section: Introductionmentioning

confidence: 99%

A wearable fiber-optic sensor for monitoring human elbow and wrist joint motion

Zhao

Xie

et al. 2020

Advanced Robotics

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A wearable fiber-optic sensor for monitoring human elbow and wrist joint motionThis article describes a wearable sensor for monitoring the motion of human elbow and wrist joints. The sensor converts the joint motion angle into a displacement, which is monitored using a fiber-optic sensor based on reflective light intensity modulation. A mathematical model is established, and the potential influencing factors of the sensor are investigated. Two prototypes for elbow and wrist joint angle monitoring are fabricated and validated. The experimental results indicate that the proposed sensor has a measurement range of 0-60° (0-120°), with a resolution of 0.338° (3.6°) for monitoring the wrist joint palm flexion (elbow joint flexion). The proposed sensor has the potential to be used for rehabilitation purposes and monitoring of joint angles while performing reaching tasks, which are the most common upper-limb gestures.

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Conception and realization of an angular optical sensor

Cited by 11 publications

References 4 publications

Optical Sensors Based on Plastic Fibers

Optical Sensors Based on Plastic Fibers

Wearable Wrist Movement Monitoring Using Dual Surface-Treated Plastic Optical Fibers

A wearable fiber-optic sensor for monitoring human elbow and wrist joint motion

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