The Experts below are selected from a list of 62079 Experts worldwide ranked by ideXlab platform
Gangding Peng - One of the best experts on this subject based on the ideXlab platform.
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highly sensitive liquid level monitoring system utilizing Polymer Fiber bragg gratings
Optics Express, 2015Co-Authors: Carlos Marques, Gangding Peng, David J. WebbAbstract:A novel and highly sensitive liquid level sensor based on a Polymer optical Fiber Bragg grating (POFBG) is experimentally demonstrated. Two different configurations are studied and both configurations show the potential to interrogate liquid level by measuring the strain induced in a POFBG embedded in a silicone rubber diaphragm, which deforms due to hydrostatic pressure variations. The sensor exhibits a highly linear response over the sensing range and a good repeatability. For comparison, a similar sensor using a FBG inscribed in silica Fiber is fabricated, which displays a sensitivity that is a factor of 5 smaller than the POFBG. The temperature sensitivity is studied and a novel multi-sensor arrangement proposed which has the potential to provide level readings independent of temperature and the liquid density.
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Polymer Fiber Bragg grating sensors: Recent advancements and applications
2014Co-Authors: Ginu Rajan, Eliathamby Ambikairajah, Kishore Bhowmik, Gangding PengAbstract:Research on singlemode Polymer Fiber Bragg gratings and their applications has been considerably progressed in the recent years and in this paper we report the recent research developments on Polymer FBG sensor applications.
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experimental study and analysis of a Polymer Fiber bragg grating embedded in a composite material
Journal of Lightwave Technology, 2014Co-Authors: Ginu Rajan, Eliathamby Ambikairajah, Manjusha Ramakrishnan, Yuliya Semenova, Gerald Farrell, Gangding PengAbstract:The characteristics of Polymer Fiber Bragg gratings (FBGs) embedded in composite materials are studied in this paper and are compared with characteristics of their silica counterparts. A Polymer FBG of 10 mm length which exhibits a peak reflected wavelength circa 1530 nm is fabricated and characterized for this purpose. A silica FBG with a peak reflected wavelength circa 1553 nm is also embedded in the composite material for a comparison study. The fabricated composite material sample with embedded sensors is subjected to temperature and strain changes and the corresponding effects on the embedded Polymer and silica FBGs are studied. The measured temperature sensitivity of the embedded Polymer FBG was close to that of the same Polymer FBG in free space, while the silica FBG shows elevated temperature sensitivity after embedding. With an increase in temperature, spectral broadening was observed for the embedded Polymer FBG due to the stress induced by the thermal expansion of the composite material. From the observed wavelength shift and spectral bandwidth change of the Polymer FBG, temperature and thermal expansion effects in the composite material can be measured simultaneously.
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investigation into time response of Polymer Fiber bragg grating based humidity sensors
Journal of Lightwave Technology, 2012Co-Authors: Wei Zhang, David J. Webb, Gangding PengAbstract:In this work we experimentally investigate the response time of humidity sensors based on Polymer optical Fiber Bragg gratings. By the use of etching with acetone we can control the poly (methyl methacrylate) based Fiber in order to reduce the diffusion time of water into the Polymer and hence speed up the relative wavelength change caused by humidity variations. A much improved response time of 12 minutes for humidity decrease and 7 minutes for humidity increase, has been achieved by using a Polymer optical Fiber Bragg grating with a reduced diameter of 135 microns.
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Etched singlemode Polymer Fiber Bragg gratings for high sensitivity tensile force measurements
2012 Photonics Global Conference (PGC), 2012Co-Authors: Ginu Rajan, Yanhua Luo, Gangding Peng, Bing LiuAbstract:Singlemode Polymer Fiber Bragg gratings (FBG) are etched up to a thickness of 30 µm to be used for high sensitivity tensile force measurements. The singlemode Polymer Fiber and the gratings are fabricated using the in-house fabrication facility. The fabricated cladding etched Polymer FBGs are characterized for low value tensile force measurements and the sensitivity of the sensors are measured and compared with the theoretically estimated values. A sensitivity of 643 nm/N is obtained for the Polymer Bragg grating with a diameter of 30 µm. Given the bio-compatible nature of Polymer Fibers, such high sensitivity force sensors can found applications in bio-medical field where high sensitivity low value force/pressure measurements are required
Kwai-man Luk - One of the best experts on this subject based on the ideXlab platform.
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characterization and modeling of bragg gratings written in Polymer Fiber for use as filters in the thz region
Optics Express, 2012Co-Authors: Shu Fan Zhou, L. Reekie, Hau Ping Chan, Y. T. Chow, Po Sheun Chung, Kwai-man LukAbstract:We demonstrate Fiber Bragg gratings written in Polymer Fiber for use in the THz window for the first time. A KrF excimer laser operating at 248 nm was used to inscribe notch-type gratings in single component Topas subwavelength Fiber. A transmission loss at the centre wavelength of the grating of 60 dB is observed in short gratings containing only 192 notches. Experimental results and modeling are presented. The gratings are expected to find use in THz signal filtering and chemical or biosensing applications.
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Polymer Fiber Bragg gratings for the THz region
National Fiber Optic Engineers Conference, 2012Co-Authors: S. F. Zhou, L. Reekie, Hau Ping Chan, Y. T. Chow, P. S. Chung, Kwai-man LukAbstract:THz Fiber Bragg gratings have been inscribed for the first time in Polymer Fiber using a KrF excimer laser. A transmission loss of 60 dB is observed. Experimental results and modeling are presented.
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Polymer Fiber Polarizer for Terahertz Applications
IEEE Photonics Technology Letters, 2012Co-Authors: Shu Fan Zhou, L. Reekie, Hau Ping Chan, Yuk Tak Chow, Po Sheun Chung, Kwai-man LukAbstract:An all-Polymer Fiber polarizer is proposed for terahertz applications. The polarizer is based on a mechanism which makes use of subwavelength Fibers and absorption films. Several centimeters of the film could give an extinction ratio of 30 dB, while keeping the insertion loss below 4 dB. Experiments have been conducted to verify the mechanism and distinct polarization-dependent absorptions have been obtained.
David J. Webb - One of the best experts on this subject based on the ideXlab platform.
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highly sensitive liquid level monitoring system utilizing Polymer Fiber bragg gratings
Optics Express, 2015Co-Authors: Carlos Marques, Gangding Peng, David J. WebbAbstract:A novel and highly sensitive liquid level sensor based on a Polymer optical Fiber Bragg grating (POFBG) is experimentally demonstrated. Two different configurations are studied and both configurations show the potential to interrogate liquid level by measuring the strain induced in a POFBG embedded in a silicone rubber diaphragm, which deforms due to hydrostatic pressure variations. The sensor exhibits a highly linear response over the sensing range and a good repeatability. For comparison, a similar sensor using a FBG inscribed in silica Fiber is fabricated, which displays a sensitivity that is a factor of 5 smaller than the POFBG. The temperature sensitivity is studied and a novel multi-sensor arrangement proposed which has the potential to provide level readings independent of temperature and the liquid density.
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acousto optic effect in microstructured Polymer Fiber bragg gratings simulation and experimental overview
Journal of Lightwave Technology, 2013Co-Authors: Carlos Marques, L Kahn, Roberson A Oliveira, Lúcia Bilro, David J. Webb, Rogerio N NogueiraAbstract:A fine control of the microstructured Polymer Fiber Bragg grating spectrum properties, such as maximum reflected power and 3-dB bandwidth, through acousto-optic modulation is presented. For simulation purposes, the device is modelled as a single structure, comprising a silica horn and a Fiber Bragg grating. For similar sized structures a good correlation between the numerical results and the experimental data is obtained, allowing the strain field to be completely characterized along the whole structure. It is also shown that the microstructured Polymer Fiber Bragg grating requires less effort from the piezoelectric actuator to produce modification in the grating spectrum when compared with a silica Fiber Bragg grating. This technique has potential to be applied on tunable optical filters and tunable cavities for photonic applications.
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investigation into time response of Polymer Fiber bragg grating based humidity sensors
Journal of Lightwave Technology, 2012Co-Authors: Wei Zhang, David J. Webb, Gangding PengAbstract:In this work we experimentally investigate the response time of humidity sensors based on Polymer optical Fiber Bragg gratings. By the use of etching with acetone we can control the poly (methyl methacrylate) based Fiber in order to reduce the diffusion time of water into the Polymer and hence speed up the relative wavelength change caused by humidity variations. A much improved response time of 12 minutes for humidity decrease and 7 minutes for humidity increase, has been achieved by using a Polymer optical Fiber Bragg grating with a reduced diameter of 135 microns.
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Humidity insensitive TOPAS Polymer Fiber Bragg grating sensor
Opt. Express, 2011Co-Authors: Wu Fu-yuan, Lutful Khan, Kyriacos Kalli, Alessio Stefani, David J. Webb, Ole BangAbstract:We report the first experimental demonstration of a humidity insensitive Polymer optical Fiber Bragg grating (FBG), as well as the first FBG recorded in a TOPAS Polymer optical Fiber in the important low loss 850nm spectral region. For the demonstration we have fabricated FBGs with resonance wavelength around 850 nm and 1550 nm in single-mode microstructured Polymer optical Fibers made of TOPAS and the conventional poly (methyl methacrylate) (PMMA). Characterization of the FBGs shows that the TOPAS FBG is more than 50 times less sensitive to humidity than the conventional PMMA FBG in both wavelength regimes. This makes the TOPAS FBG very appealing for sensing applications as it appears to solve the humidity sensitivity problem suffered by the PMMA FBG.
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Polarimetric sensitivity to hydrostatic pressure and temperature in birefringent dual-core microstructured Polymer Fiber
Fourth European Workshop on Optical Fibre Sensors, 2010Co-Authors: Marcin K Szczurowski, Gabriela Statkiewicz-barabach, Tadeusz Martynkien, Waclaw Urbanczyk, David J. WebbAbstract:We experimentally characterized a birefringent microstructured Polymer Fiber of specific construction, which allows for single mode propagation in two cores separated by a pair of large holes. The Fiber exhibits high birefringence in each of the cores as well as relatively weak coupling between the cores. Spectral dependence of the group and the phase modal birefringence was measured using an interferometric method. We have also measured the sensing characteristics of the Fiber such as the polarimetric sensitivity to hydrostatic pressure and temperature.
Rogerio N Nogueira - One of the best experts on this subject based on the ideXlab platform.
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Strain Sensitivity Control of an In-Series Silica and Polymer FBG
Sensors, 2018Co-Authors: Ricardo Oliveira, Lúcia Bilro, Rogerio N NogueiraAbstract:This work reports on the use of an in-series silica and Polymer Fiber Bragg grating (FBG) to control the FBG strain sensitivities and enhance in the case of the Polymer Fiber Bragg grating (PFBG). Due to differences in the Young’s Modulus of the Fibers employed, the amount of strain is unequally distributed in each Fiber section. By acting on the silica Fiber length, it was possible to control the strain sensitivity of the two FBGs, allowing a Polymer FBG strain sensitivity much higher than the one found in the elementary Fiber to be obtained. The influence of the diameter of the Polymer Fiber on the strain sensitivities of the FBGs was also investigated. Results have shown that, besides the strain sensitivity control, an even greater improvement in the PFBG strain sensitivity can be achieved.
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acousto optic effect in microstructured Polymer Fiber bragg gratings simulation and experimental overview
Journal of Lightwave Technology, 2013Co-Authors: Carlos Marques, L Kahn, Roberson A Oliveira, Lúcia Bilro, David J. Webb, Rogerio N NogueiraAbstract:A fine control of the microstructured Polymer Fiber Bragg grating spectrum properties, such as maximum reflected power and 3-dB bandwidth, through acousto-optic modulation is presented. For simulation purposes, the device is modelled as a single structure, comprising a silica horn and a Fiber Bragg grating. For similar sized structures a good correlation between the numerical results and the experimental data is obtained, allowing the strain field to be completely characterized along the whole structure. It is also shown that the microstructured Polymer Fiber Bragg grating requires less effort from the piezoelectric actuator to produce modification in the grating spectrum when compared with a silica Fiber Bragg grating. This technique has potential to be applied on tunable optical filters and tunable cavities for photonic applications.
Carlos Marques - One of the best experts on this subject based on the ideXlab platform.
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toward commercial Polymer Fiber bragg grating sensors review and applications
Journal of Lightwave Technology, 2019Co-Authors: Christian Broadway, Carlos Marques, Rui Min, Arnaldo G Lealjunior, Christophe CaucheteurAbstract:Interest in Polymer optical Fiber Bragg gratings (POFBGs) arises from the different material properties and sensing modalities brought by Polymers relative to silica. Polymer Fibers typically offer twice the sensitivity to temperature of conventional silica Fiber and increased sensitivity to strain overall. In addition, Polymer Fibers have higher elastic limits and as a result a larger range of operation for physical constraints. While some Polymers are effectively humidity insensitive, others present inherent humidity sensitivity. Their organic properties also allow a variety of chemical processes to create (bio)chemical sensors, with the consequences of Fiber breakage in situ being less hazardous than silica. These attributes have led to the use of POFBGs for applications that remain complex using silica Fibers. This review paper covers the progress toward commercialization and the increasing number of specific applications.
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Microstructured PMMA POF chirped Bragg gratings for strain sensing
Optical Fiber Technology, 2018Co-Authors: Beatriz Ortega, Christian Broadway, Xuehao Hu, Paulo Antunes, Christophe Caucheteur, Ole Bang, Carlos MarquesAbstract:Abstract We demonstrate a chirped microstructured Polymer Fiber Bragg grating based on taper technology for strain sensing application. The effective bandwidth of the grating is dependent on strain and remains practically constant with respect to temperature and humidity changes. We report a sensitivity of 0.90 pm/µe for the central wavelength under stable temperature and humidity values. The 3-dB bandwidth of the grating has been measured under different temperature and humidity conditions.
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highly sensitive liquid level monitoring system utilizing Polymer Fiber bragg gratings
Optics Express, 2015Co-Authors: Carlos Marques, Gangding Peng, David J. WebbAbstract:A novel and highly sensitive liquid level sensor based on a Polymer optical Fiber Bragg grating (POFBG) is experimentally demonstrated. Two different configurations are studied and both configurations show the potential to interrogate liquid level by measuring the strain induced in a POFBG embedded in a silicone rubber diaphragm, which deforms due to hydrostatic pressure variations. The sensor exhibits a highly linear response over the sensing range and a good repeatability. For comparison, a similar sensor using a FBG inscribed in silica Fiber is fabricated, which displays a sensitivity that is a factor of 5 smaller than the POFBG. The temperature sensitivity is studied and a novel multi-sensor arrangement proposed which has the potential to provide level readings independent of temperature and the liquid density.
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acousto optic effect in microstructured Polymer Fiber bragg gratings simulation and experimental overview
Journal of Lightwave Technology, 2013Co-Authors: Carlos Marques, L Kahn, Roberson A Oliveira, Lúcia Bilro, David J. Webb, Rogerio N NogueiraAbstract:A fine control of the microstructured Polymer Fiber Bragg grating spectrum properties, such as maximum reflected power and 3-dB bandwidth, through acousto-optic modulation is presented. For simulation purposes, the device is modelled as a single structure, comprising a silica horn and a Fiber Bragg grating. For similar sized structures a good correlation between the numerical results and the experimental data is obtained, allowing the strain field to be completely characterized along the whole structure. It is also shown that the microstructured Polymer Fiber Bragg grating requires less effort from the piezoelectric actuator to produce modification in the grating spectrum when compared with a silica Fiber Bragg grating. This technique has potential to be applied on tunable optical filters and tunable cavities for photonic applications.