An evaluation of a novel plastic optical fibre sensor for axial strain and bend measurements

Kuang, K. S. C.; Cantwell, W.J.; Scully, Patricia

doi:10.1088/0957-0233/13/10/303

Cited by 174 publications

(142 citation statements)

References 25 publications

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“…3 POF sensors for strain and curvature measurement have been reported in the literature. 4 However, these measurements have generally been intensiometric measurements made with multimode fibers. Whereas robust sensors have been demonstrated to use intensity modulating mechanisms, they are susceptible to unwanted intensity losses, for example, bend loss or connector loss, and to variations in source power.…”

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confidence: 99%

Strain and temperature sensitivity of a single-mode polymer optical fiber

et al. 2005

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We have measured the optical phase sensitivity of fiber based on poly(methyl methacrylate) under nearsingle-mode conditions at 632.8 nm wavelength. The elongation sensitivity is 131± 3 ϫ 10 5 rad m −1 and the temperature sensitivity is −212± 26 rad m −1 K −1 . These values are somewhat larger than those for silica fiber and are consistent with the values expected on the basis of the bulk polymer properties. © 2005 Optical Society of America OCIS codes: 060.2300, 060.2370 Fiber optic strain sensors offer advantages that include insensitivity to electromagnetic fields, light weight, and minimal intrusiveness 1 compared with conventional strain gauges. Fused silica, the material of choice for the majority of optical fibers, has near-ideal mechanical characteristics for many strain-sensing applications. However, fused-silica fibers have an upper strain limit of approximately 3-5% and in general are reliable only to ϳ1% strain after selection of fibers by proof testing.2 In highly loaded engineering structures such as highway bridges, buildings, and aircraft wings, transverse loading can result in large bending strains, which can induce locally high strains, so monitoring structural strain is becoming increasingly important. With the advent of new engineering materials, such as composites, the acceptable range of applied strain can exceed the breaking strain of fused-silica fiber, precluding the use of standard fiber-based strain gauges. The inherent fracture toughness and flexibility of polymer optical fibers (POFs) makes them much more suitable in high-strain applications than their glass-based counterparts. In addition, fiber Bragg gratings have recently been written into POFs, broadening their potential applications. 3POF sensors for strain and curvature measurement have been reported in the literature. 4 However, these measurements have generally been intensiometric measurements made with multimode fibers. Whereas robust sensors have been demonstrated to use intensity modulating mechanisms, they are susceptible to unwanted intensity losses, for example, bend loss or connector loss, and to variations in source power. These losses may be addressed technically, by use of additional reference power measurements, for example, but an alternative to intensity measurement is desirable. Interferometry offers a potential alternative, in which the sensing element is a length of fiber between a pair of partially reflecting splices 5 or a pair of matched Bragg gratings. 6 To produce these designs, single-mode fiber rather than conventional multimode POF is required. The advent of single-mode POF offers the potential for highstrain fiber sensors to exploit the advantages of interferometry. We report here interferometric measurement of the optical phase sensitivities of single-mode POF versus strain and temperature changes.The POF (Paradigm Optics) used in these experiments had a cladding diameter of ϳ125 m (commercial acrylic with n = 1.4905) and a core diameter of 6 m [poly(methyl methacrylate) (PMMA) doped with Ͻ3% polysty...

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Strain and temperature sensitivity of a single-mode polymer optical fiber

et al. 2005

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“…While good performance was achieved with different methods, previous designs rely on the accurate alignment of the optic fiber with either a reflective element or a lens, which in practice can be challenging to achieve. In this work a simple and affordable 1-DOF force sensor was developed based on the method presented in [22], which makes use of a single core fiber and does not require mirrors or lenses. The main drawback of this approach is the larger size of the sensor.…”

Section: Fiber Optic Sensormentioning

confidence: 99%

Adaptive control of a master-slave system for teleoperated needle insertion under MRI-guidance

Franco

Ristić

2015

2015 23rd Mediterranean Conference on Control and Automation (MED)

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Abstract-This paper presents the control of a master-slave system for teleoperated needle insertion under guidance by Magnetic Resonance Imaging (MRI). The primary aim of our research is the robot-assisted laser ablation of liver tumors. The master-slave system consists of a master unit that sits next to the operator, outside the scanner room, and of a slave unit located inside the cylindrical MRI scanner. The needle insertion force is measured with a specially designed fiber optic force sensor mounted on the slave unit. Pneumatic actuation is employed in both master and slave in order to minimize the interference with the MRI environment. Accurate position control of the slave unit is achieved with a Time Delay Control scheme (TDC). Differently from previous designs, the force feedback on the master unit is provided by an adaptive controller that compensates the friction of the pneumatic actuator. The advantages over a baseline force controller are demonstrated with experiments on silicone rubber phantoms.

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“…In one of their earlier works, Kuang et al [9] investigated the use of such type of POF sensor to monitor the mechanical response of a number of plastic specimens. The POF utilised in their studies was a step-index 1mm diameter PMMA POF supplied by Mitsubishi Rayon Co. Ltd.…”

Section: Applications Of Intensity-based Pof Sensorsmentioning

confidence: 99%

Sensing Applications for Plastic Optical Fibres in Civil Engineering

Kuang¹

2012

Fiber Optic Sensors

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An evaluation of a novel plastic optical fibre sensor for axial strain and bend measurements

Cited by 174 publications

References 25 publications

Strain and temperature sensitivity of a single-mode polymer optical fiber

Strain and temperature sensitivity of a single-mode polymer optical fiber

Adaptive control of a master-slave system for teleoperated needle insertion under MRI-guidance

Sensing Applications for Plastic Optical Fibres in Civil Engineering

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