High Sensitivity Polymer Optical Fiber-Bragg-Grating-Based Accelerometer

Stefani, Alessio; Andresen, Søren; Yuan, Wu; Herholdt-Rasmussen, Nicolai; Bang, Ole

doi:10.1109/lpt.2012.2188024

Cited by 167 publications

(98 citation statements)

References 21 publications

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“…In addition, the biocompatibility and non-brittle nature of POFs means that they are clinically acceptable and can be employed in in-vivo applications [6]. Such advantages of POF sensors enable their application to measure parameters like temperature [7], strain [8], humidity [9], curvature [10], acceleration [11], and liquid level [12]. Furthermore, POF sensors are employed in biomedical applications such as antibody [13,14] and glucose sensors [15].…”

Section: Introductionmentioning

confidence: 99%

Fast and stable gratings inscription in POFs made of different materials with pulsed 248 nm KrF laser

et al. 2018

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Section: Introductionmentioning

confidence: 99%

Fast and stable gratings inscription in POFs made of different materials with pulsed 248 nm KrF laser

et al. 2018

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“…When a polymer optical fiber Bragg grating (POFBG) sensor is placed for several minutes under sufficient tension to cause a considerable elongation, a significant wavelength shift may remain when the tension is removed, which only gradually relaxes over time [6]. This is on the face of it a serious problem for practical applications of such strain sensors.The application of pretension [7] to the POFBG or the annealing of the fiber [8] has been reported to reduce hysteresis in some situations. However, in this Letter we show that, for many practical applications, the hysteresis will actually be much lower than expected from existing published data.…”

mentioning

confidence: 99%

Influence of mounting on the hysteresis of polymer fiber Bragg grating strain sensors

Abang

Webb

2013

Opt. Lett.

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Fiber Bragg grating sensors recorded in poly(methyl methacrylate) fiber often exhibit hysteresis in the response of Bragg wavelength to strain, particularly when exposed to high levels of strain. We show that, when such a fiber grating sensor is bonded directly to a substrate, the hysteresis is reduced by more than 12 times, compared to the case where the sensor is suspended freely between two supports. © . This is important when fiber sensors are used to monitor structures that are themselves rather compliant, as is the case, for example, with a tapestry [3]. In such situations, the use of silica fiber tends to locally reinforce the structure and reports strain much lower than the true background strain in the material. As a viscoelastic material, the tensile properties of polymers are complicated; they display both hysteresis and a dependence on the timescales involved [4] and the magnitude of applied strain [5]. When a polymer optical fiber Bragg grating (POFBG) sensor is placed for several minutes under sufficient tension to cause a considerable elongation, a significant wavelength shift may remain when the tension is removed, which only gradually relaxes over time [6]. This is on the face of it a serious problem for practical applications of such strain sensors.The application of pretension [7] to the POFBG or the annealing of the fiber [8] has been reported to reduce hysteresis in some situations. However, in this Letter we show that, for many practical applications, the hysteresis will actually be much lower than expected from existing published data. The point is that the experiments that have revealed the presence of hysteresis are usually conducted by fixing the fiber at two points on either side of the sensor, with one of these points capable of being moved using a translation stage. However, when grating sensors are applied to the monitoring of strain in a structure, they would normally either be glued to the structure directly [9] or possibly embedded in it [10].In this work we compare the behavior of two identical sensors, where one is strained between two supports while the other is bonded directly to a cantilever. We show that the latter approach, which is much more characteristic of the way sensors would be applied in practice, displays hysteresis reduced more than 1 order of magnitude from the former.Two identical FBGs were fabricated in few-moded microstructured polymer optical fiber (mPOF) fabricated from poly(methyl methacrylate) (PMMA) and obtained from Kiriama Pty Ltd. Most polymer fibers in use today are based on PMMA, although it should be noted that other materials may have advantages for sensing applications [11]. The core of the fiber is bounded by three rings of 5 μm holes spaced 5 μm apart. The few-moded fiber has a core diameter of 50 μm and an outer diameter of 150 μm. A helium-cadmium laser with a wavelength of 325 nm and a power output of 30 mW was used to inscribe the Bragg gratings in the mPOF. The laser beam was focused vertically downward using a 10 cm focal length cylindric...

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“…Moreover, the lower Young's modulus of PC compared to PMMA is likely to increase the sensitivity of PC-based mPOFs in vibration sensors and accelerometers [56].…”

Section: Mechanical Testing Of the Pc Mpofmentioning

confidence: 99%

Fabrication and characterization of polycarbonate microstructured polymer optical fibers for high-temperature-resistant fiber Bragg grating strain sensors

Fasano

Woyessa

Stajanča

et al. 2016

Opt. Mater. Express

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121

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Abstract:Here we present the fabrication of a solid-core microstructured polymer optical fiber (mPOF) made of polycarbonate (PC), and report the first experimental demonstration of a fiber Bragg grating (FBG) written in a PC optical fiber. The PC used in this work has a glass transition temperature of 145°C. We also characterize the mPOF optically and mechanically, and further test the sensitivity of the PC FBG to strain and temperature. We demonstrate that the PC FBG can bear temperatures as high as 125°C without malfunctioning. In contrast, polymethyl methacrylate-based FBG technology is generally limited to temperatures below 90°C. ©2016 Optical Society of America

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High Sensitivity Polymer Optical Fiber-Bragg-Grating-Based Accelerometer

Cited by 167 publications

References 21 publications

Fast and stable gratings inscription in POFs made of different materials with pulsed 248 nm KrF laser

Fast and stable gratings inscription in POFs made of different materials with pulsed 248 nm KrF laser

Influence of mounting on the hysteresis of polymer fiber Bragg grating strain sensors

Fabrication and characterization of polycarbonate microstructured polymer optical fibers for high-temperature-resistant fiber Bragg grating strain sensors

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