Cleaving of solid single mode polymer optical fiber for strain sensor applications

Abdi, O.; Wong, K; Hassan, Tasnim; Peters, Kara; Kowalsky, Mervyn J.

doi:10.1016/j.optcom.2008.11.046

Cited by 28 publications

(26 citation statements)

References 17 publications

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“…A butt-coupled connection was made between the arm of the silica coupler and the mPOF using an fiber connector/angled physical contact (FC/APC) connector on the silica fiber. The end faces of the POF were cleaved using an 80°C hot cleave as described by Abdi et al [12]. A small amount of polymer index matching gel was used in the coupling to reduce Fresnel reflections.…”

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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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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“…From previous work with silicon-nitride waveguides on silicon, a coupling coefficient of about 5 % has been proven to be useful for gas detection 7 Simulations with various gap dimensions were performed to identify the separation for the waveguides for a coupling factor close to 5%. The results are shown in Fig 3. Since all loss mechanisms have been neglected for these simulations, the coupling factor is expected to be smaller for the actual device with these dimensions.…”

Section: Coupling Efficiencymentioning

confidence: 99%

“…For this, a selfmade POF-cleaver was used (refer to Figure 8, designed according to results of Stefani et al [6] and Abdi et al 7 who aimed at cleaving techniques for photonic-crystal-POF. The cleaver consists of a heated base plate and a heated razorblade on linear guides, both independently temperature-controlled by a two-level controller.…”

Section: Preparation Of the End Facetsmentioning

confidence: 99%

Ring resonators in polymer foils for sensing of gaseous species

et al. 2015

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In this paper, the concept of a micro ring resonator formed of waveguides in off-the-shelf polymers is presented. Extensive simulations were performed to determine appropriate dimensions for the waveguide and the design of ring and coupling zone as well as for the estimation of losses. Based on the calculated parameters, a first polymer ring resonator was realized using microscope projection lithography

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“…In practice, light from either a pigtailed silica fiber or directly from a LED, laser or halogen lamp is coupled into small diameter POF using free-space coupling, which requires precise alignments and a good fiber end-face of POF. Hotknife cutting is considered to be a feasible method of cleaving small diameter POFs [3] but the fiber end-face produced from this technique is far from ideal, therefore greatly reduce the coupling efficiency. Polishing small diameter POF was also explored and found to be difficult [3].The side-illumination fluorescence (SIF) technique on POFs provides with a promising light conversion/coupling method to improve efficiency, and the setup is relatively simple.…”

Section: Introductionmentioning

confidence: 99%

“…Hotknife cutting is considered to be a feasible method of cleaving small diameter POFs [3] but the fiber end-face produced from this technique is far from ideal, therefore greatly reduce the coupling efficiency. Polishing small diameter POF was also explored and found to be difficult [3].The side-illumination fluorescence (SIF) technique on POFs provides with a promising light conversion/coupling method to improve efficiency, and the setup is relatively simple. Organic dyes can be doped into the POFs due to the low processing temperature of POFs of below 200°C [4].…”

Section: Introductionmentioning

confidence: 99%

Side-Illumination Fluorescence Dye-Doped-Clad PMMA-Core Polymer Optical Fiber: Potential Intrinsic Light Source for Biosensing

Pun

Liu

Tse

et al. 2012

IEEE Photon. Technol. Lett.

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A specially designed laser-dye-doped polymer optical fiber (POF) was drawn and investigated experimentally. The cladding of the POF was doped with Rhodamine 640 and pumped with a compact and low-cost 532-nm diode-pumped solid-state laser. By using the side-illumination fluorescence technique, any section along the POF can act as an intrinsic light source. The fluorescence power of the dye-doped POF under side-illumination was improved by more than 10 times by a bending method. With this enhancement, the issue of coupling light into the POF becomes simpler, cheaper, and more consistent, constructing a practical platform for a sensing system. Index Terms-All-polymer device, fiber design, laser dye, side-illumination.

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Cleaving of solid single mode polymer optical fiber for strain sensor applications

Cited by 28 publications

References 17 publications

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

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

Ring resonators in polymer foils for sensing of gaseous species

Side-Illumination Fluorescence Dye-Doped-Clad PMMA-Core Polymer Optical Fiber: Potential Intrinsic Light Source for Biosensing

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