Conference 7004
Monday-Friday 14-18 April 2008
Proceedings of SPIE Vol. 7004
19th International Conference on Optical Fibre Sensors
Conference Chair: David D. Sampson, The Univ. of Western Australia (Australia)
Conference Co-Chairs: Stephen F. Collins, Victoria Univ. (Australia); Kyunghwan (Ken) Oh, Yonsei Univ. (South Korea); Ryozo R. Yamauchi, Fujikura Ltd. (Japan)
Conference Registration, Room: Indian Ocean Suite
| Monday | 11:00 - 18:00 |
| Tuesday | 8:00 - 17:30 |
| Wednesday | 8:00 - 13:00 |
| Thursday | 8:00 - 17:00 |
| Friday | 8:00 - 13:00 |
Tuesday 15 April
Opening Session
| Room: Sirius Room | Tue. 8:45 - 10:30 |
8:45: Opening Remarks,
David D. Sampson, General Chair
Indigenous welcome, James Webb
Opening Ceremony, Lyn D. Beazley, Chief Scientist of Western Australia
9:15: Pervasive Monitoring Systems for Personalised Healthcare (Plenary Presentation), Alison Burdett, Toumaz Technology (United Kingdom) [7004‑293]
10:00: Fiber-top micromachined devices (Invited Paper), Davide Iannuzzi, Sven de Man, Catharina J. Alberts, Vrije Univ. (Netherlands); Johannes W. Berenschot, Michael C. Elwenspoek, Univ. Twente (Netherlands); Ali A. Said, Mark Dugan, Translume, Inc. [7004‑277]
After a general review on fiber-top technology, we will present our recent achievements in the utilization of fiber-top double-clamped cantilevers as refractometers and in the development of alternative techniques for the fabrication of fiber-top devices.
| Coffee/Tea break | Tue. 10:30 - 11:00 |
SESSION TuB: Microstructured Fibres I
| Room: Sirius Room | Tue. 11:00 - 12:30 |
11:00: Recent developments in microstructured optical fibers and optical fiber glasses (Invited Paper), Jean-Marc Blondy, Univ. de Limoges (France) [7004‑285]
11:30: Photonic crystal diaphragm based fiber-tip hydrophone optimized for ocean acoustics, Onur Kilic, Michel J. F.Digonnet, Gordon S. Kino, Olav D. Solgaard, Stanford Univ. [7004‑104]
We report a novel Fabry-Perot hydrophone made of a reflective nanomembrane placed at the end of a mirrored fiber, with a 1-Hz–100-kHz bandwidth, a 200-dB dynamic range, and a sensitivity matched to ocean noise.
11:45: Merging porphyrins and structured optical fibres: future technology for chemical sensors, Cicero Martelli, John Canning, Maxwell J. Crossley, Danial M. Stoks, Maxine Sintic, The Univ. of Sydney (Australia) [7004‑115]
The integration of porphyrins and structured fibres is proposed for biological and chemical sensing. Spectroscopic measurements in water-soluble molecules and fabrication of self-assembled thin-films (possibly mono-layers) inside the fibre holes are described and characterised.
12:00: High-temperature sensor based on a photonic crystal fiber interferometer, Myoung-Jin Kim, Kwan-Seob Park, Hae-Young Choi, Byeong-Ha Lee, Gwangju Institute of Science and Technology (South Korea); Se-Jong Baik, Kiegon Im, Chonnam National Univ. (South Korea) [7004‑110]
We present a high temperature sensor based on the intrinsic photonic crystal fiber interferometer which is available from room temperature to 900 centidegree.
12:15: Compact in-fiber polarizer based on the hollow-core photonic bandgap fiber, HaiFeng Xuan, Tsinghua Univ. (China); Wei Jin, Jian Ju, Yiping Wang, The Hong Kong Polytechnic Univ. (Hong Kong China); Min Zhang, Yanbiao Liao, Tsinghua Univ. (China); Yuanhong Yang, Beihang Univ. (China) [7004‑87]
Broadband, compact in-fiber polarizers, which have better than 20 dB PDLs over range of 100nm, were fabricated by using a pulsed CO2 laser to modify the air-holes along one-side of a hollow-core photonic bandgap fiber.
Lunch break
| Room: Atrium Garden Restaurant (Food/menu to be decided) | Tue. 12:30 - 14:00 |
SESSION TuC: Fiber Bragg Grating Sensors
| Room: Sirius Room | Tue. 14:00 - 15:30 |
14:00: Progress in photosensitivity for writing Bragg gratings (Invited Paper), John Canning, The Univ. of Sydney (Australia) [7004‑276]
Invited talk:
Although mainstream grating writing, more often than not using single photon excitation of germanosilicate based defects with CW 244nm light, remains the key technology for complex devices it is now being complemented by a whole host of processes which can enhance and tailor the properties of both conventional and not-so-conventional fibre Bragg gratings. Further, processes for writing in non-germanosilicate based gratings have also continued to develop and include multi-photon excitation directly into the band edge of the glass. It is now possible to custom tailor a gratings property based on the application and the nature of production as well as custom tailor the grating writing process to suit the type of fibre and application.
14:30: Ratiometric interrogation of dynamically strained fiber Bragg gratings, Robert R. J.Maier, James S. Barton, Heriot-Watt Univ. (United Kingdom); Mathias Kuhn, Univ. Würzburg (Germany) and Heriot-Watt Univ. (United Kingdom) [7004‑50]
We demonstrate highly flexible ratiometric technique for high speed dynamic interrogation of fiber Bragg gratings [FBG] employing a pulsed broad band light source, a single detector and 2 filter FBGs mounted on a temperature controlled cantilever.
14:45: Soldering fiber Bragg grating sensors for strain measurement, Mathias S. Mueller, Lars Hoffmann, Tobias Lautenschlager, Alexander W. Koch, Technische Univ. München (Germany) [7004‑183]
Metal coated fiber Bragg gratings for axial strain monitoring are studied theoretically by simulations and experimentally. The influence of high Young's modulus bonding such as soldering to the structure is observed to have negligible influence
15:00: High-sensitivity temperature-independent strain sensor based on a long-period fiber grating with a CO2 laser engraved rotary structure, Tao Zhu, Yun-Jiang Rao, Yun Song, Chongqing Univ. (China); Kin-Seng Chiang, City Univ. of Hong Kong (Hong Kong China) [7004‑76]
A highly sensitive strain sensor based on the use of a long-period fiber grating with rotary grooves carved by high-frequency CO2-laser pulses was reported, which has a strain sensitivity of ~0.1nm/micro-strain without any temperature compensation.
15:15: The spectral characteristics of femtosecond laser inscribed long period grating bend sensors written into a photonic crystal fibre, Thomas D. P.Allsop, Aston Univ. (United Kingdom); Kyriacos Kalli, Cyprus University of Technology (Cyprus); Kaiming Zhou, Aston Univ. (United Kingdom); Graham Smith, Aston Univ (United Kingdom); David J. Webb, Vladimir K. Mezentsev, Ian Bennion, Aston Univ. (United Kingdom) [7004-256]
A series of LPGs was inscribed in photonic crystal fibre by a low repetition femtosecond laser system. When subjected to bending they were found to be spectrally sensitive to bend orientation and displayed a strong polarisation dependence
| Coffee/Tea break | Tue. 15:30 - 16:00 |
SESSION TuD: Physical, Mechanical, and Electromagnetic Sensors I
| Room: Sirius Room | Tue. 16:00 - 17:30 |
16:00: Nonlinearities in the high-current response of interferometric fiber optic current sensors, Klaus M. Bohnert, ABB Corporate Research (Switzerland); Philippe Gabus, ABB Ltd. (Switzerland); Jürgen Nehring, Samuel Wiesendanger, Andreas Frank, Hubert Brändle, ABB Corporate Research (Switzerland) [7004‑68]
The nonlinearities in the response of an interferometric fiber-optic current sensor associated with inherent temperature compensation of the Faraday effect are investigated at currents up to several 100 kA and temperatures between -40 and 80°C.
16:15: Triple-wavelength SOA-based fiber ring laser for use in wavelength division multiplexed FBG vibration sensor array, Satohi Tanaka, Hiroyuki Somatomo, Kiyoyuki Inamoto, Nobuaki Takahashi, National Defense Academy (Japan) [7004‑139]
By combining an SOA and FBGs, multi-wavelength and tunable fiber ring laser is fabricated to implement an FBG vibration sensor array in which detection of multipoint vibrations and temperature stabilization for the detection can be achieved.
16:30: Radial deformation measurement of a cylinder under compression using multicore fibre, Amanda Fender, William N. MacPherson, Robert R. J.Maier, James S. Barton, Julian D. C.Jones, Heriot-Watt Univ. (United Kingdom); Kevin S. Ellis, Claire L. Leppard, Paul G. Blackwell, James R. Miller, Benjamin J. S.Jones, Scott McCulloch, Atomic Weapons Establishment (United Kingdom); Xianfeng Chen, Rui Suo, Lin Zhang, Aston Univ. (United Kingdom) [7004‑88]
A low-contact, temperature insensitive radial deformation sensor based on multicore fibre bend measurement is shown to have a resolution of at least 30 microns for a compressed cylinder with ~1cm radius.
16:45: Optical temperature point-sensor array for oil and gas down-hole applications, Domino Taverner, Edward Dowd, John Grunbeck, James R. Dunphy, Guy Daigle, Rich Jones, Douglas A. Norton, Trevor W. MacDougall, Weatherford Artificial Lift Systems Inc. [7004‑95]
An armored, ¼” cabled, temperature sensor array was developed for oil and gas down-hole applications using Bragg gratings written into large diameter, single-mode cane waveguides to provide strain-isolated temperature sensor elements.
17:00: 3D planar velocity measurements using Mach-Zehnder interferometric-filter-based planar Doppler velocimetry (MZI-PDV) and imaging fibre bundles, Zenghai H. Lu, Thomas O. H.Charrett, Helen D. Ford, Ralph P. Tatam, Cranfield Univ. (United Kingdom) [7004‑249]
Three component planar flow-field measurements are made using imaging fibre bundles to port light to a single imaging head. Doppler frequency shifts are transduced to intensity variations using a Mach-Zehnder interferometric filter.
17:15: High-accuracy discriminative sensing of strain and temperature by use of birefringence and Brillouin scattering in a polarization-maintaining fiber, Weiwen Zou, Zuyuan He, Kazuo Hotate, The Univ. of Tokyo (Japan) [7004‑105]
The different changing behaviors of birefringence from Brillouin frequency shift (BFS) in a PANDA-type polarization-maintaining fiber on strain and temperature are theoretically analyzed and experimentally determined. Simultaneous measurements of birefringence and BFS provide a high-accuracy discrimination of 3~4 microstrain and 0.02~0.03 degree.
Posters-Tuesday
| Room: Orion/Pleiades Room | Tue. 17:30 - 19:00 |
Conference Welcome Function
| Room: Dolphin Court Pool | Tue. 19:00 - 21:00 |
Wednesday 16 April
SESSION WA: Chemical, Environmental, Biological, and Medical Sensors I
| Room: Sirius Room | Wed. 9:00 - 10:30 |
9:00: FBG applications in biomechanics (Invited Paper), Hypolito J. Kalinowski, Ctr. Federal de Educação Tecnológica do Paraná (Brazil) [7004‑286]
9:30: Fiber optic evanescent-field sensor device for carbon dioxide and explosive detection, Wolfgang Schade, Technische Univ. Clausthal (Germany) and Clausthal Univ. of Technology, LaserApplication Ctr (Germany); Rozalia Orghici, Technische Univ. Clausthal (Germany); Ulrike Willer, Technische Univ. Clausthal (Germany) and Clausthal Univ. of Technology, LaserApplication Ctr (Germany); Siegfried Waldvogel, Univ. Bonn (Germany) and Clausthal Univ. of Technology, LaserApplication Ctr (Germany) [7004‑156]
A fiber optic sensor for monitoring carbon dioxide during sequestration as well as for sensing the explosive TNT is described. The sensor is based on evanescent-field spectroscopy, functionality and sensitivity are characterized.
9:45: Novel FBG-based sensor configuration for H2 leak detection in air, Christophe Caucheteur, Marc Debliquy, Driss Lahem, Cathy I. Crunelle, Patrice Mégret, Faculté Polytechnique de Mons (Belgium) [7004‑137]
We present a H2 sensor made of FBGs surrounded by a catalytic sensitive layer that undergoes an exothermic reaction and elevates the temperature. The interrogation technique is based on the monitoring of the wavelength shift.
10:00: Comparison of palladium thin films used in a transmission-based optical fibre hydrogen sensor, Kevin D. Gleeson, Elfed Lewis, Univ. of Limerick (Ireland) [7004‑180]
This paper presents a comparison of the changes in optical transmission intensity of thin palladium films utilized as the sensing element in a transmission based fibre optic sensor for varying concentrations of hydrogen.
10:15: All-fiber optical coherence tomography system incorporating a dual fiber stretcher dispersion compensator, Sairam Iyer, Stephane Coen, Frederique Vanholsbeeck, The Univ. of Auckland (New Zealand) [7004‑237]
We demonstrate experimentally an all-fiber optical coherence tomography system where dispersion is compensated for by a pair of fiber stretchers made with different fibers. Large dispersion mismatch of both signs can be potentially canceled.
| Coffee/Tea break | Wed. 10:30 - 11:00 |
SESSION WB: Special Session: Oil and Gas: Current Practice-Future Opportunity
| Room: Sirius Room | Wed. 11:00 - 13:00 |
11:00: Active Plug and Play distributed Raman temperature sensing (Invited Paper), Kent Kalar, SensorTran, Inc. [7004‑287]
11:30: Realisation of a full-scale fibre optic ocean bottom seismic system (Invited Paper), Hilde Nakstad, Optoplan AS (Norway) [7004‑288]
12:00: Fibre sensors for a new oil and gas industry (Invited Paper), Luiz C. G.Valente, Gavea Sensors Measurement Solutions (Brazil) [7004‑289]
12:30: Fibre optics sensors for the exploration of oil and gas (Invited Paper), Tsutomu Yamate, Schlumberger K. K. [7004‑290]
Lunch break
| Room (for Delegates): Atrium Garden Restaurant | Wed. 13:00 - 14:30 |
| Room (for Technical Programme Committee): Abrolhos Room | Wed. 13:00 - 14:30 |
Social programme
| mix and match from the options below to suit your interests: |
| Visit the New Maritime Museum anytime between | 14:30 - 17:00 |
| Guided walk (30min) through Kings Park, Botanic Gardens with |
| panoramic view over Perth | 16:45 and 17:15 | |||
| View and/or purchase contemporary Australian and Western Australian |
| crafts and designs at Kings Park 'Aspects' shop anytime between | 16:30 - 17:30 | |||
| Conference Dinner, Fraser's Restaurant | 18:15 - 22:30 |
|
Transport Bus from Fremantle, to join guided walk in Kings Park, |
| departing from Maritime Museum and Esplanade Hotel | 16:00 |
| Bus from Fremantle, to attend conference dinner at Kings Park, |
| departing from Esplanade Hotel only | 16:00 and 17:30 |
| Bus from Kings Park back to Esplanade Hotel | 22:00 and 22:30 |
Thursday 17 April
SESSION ThA: Chemical, Environmental, Biological, and Medical Sensors II
| Room: Sirius Room | Thu. 9:00 - 10:30 |
9:00: Fibre optical nonlinear microendoscopy (Invited Paper), Min Gu, Swinburne Univ. of Technology (Australia) [7004‑291]
9:30: Multi-antibody biosensing with topas microstructured polymer optical fiber, Grigoriy A. Emiliyanov, Ole Bang, Technical Univ. of Denmark (Denmark); Poul E. Høiby, Exiqon A/S (Denmark); Lars H. Peredsen, Bioneer A/S (Denmark); Erik M. Kjær, Technical Univ. of Denmark (Denmark) [7004‑203]
The localized activation of sensor layers inside a Topas microstructured polymer optical fiber allows creating two different sensor sections in the same fiber. Simultaneous detection of two kinds of fluorophore-labeled antibodies is demonstrated.
9:45: Recognition of Japanese devoiced vowels using array of plastic optical fiber moisture sensors, Masayuki Morisawa, Tomohito Taki, Yoichi Natori, Shinzo Muto, Univ. of Yamanashi (Japan) [7004‑27]
A novel optical fiber microphone for discerning Japanese devoiced vowels, which is consisting of the POF moisture pattern sensors and Dynamic Programming matching method, was proposed and was confirmed that recognition rate over 90% was easily obtained.
10:00: Application of Mach-Zehnder interferometer based on long period grating structure for salinity measurement in water environment, Gustavo R. C.Possetti, Ricardo C. Kamikawachi, Celso L. Prevedello, Marcia Müller, José L. Fabris, Univ. Tecnológica Federal do Paraná (Brazil) [7004‑260]
This work reports the behavior of an in fiber Mach-Zehnder interferometer for salinity measurement. The results are compared with traditional methods and show that the device can distinguish and identify the concentration of different salts.
10:15: Tissue ablation via optical fibre delivery of UV laser radiation, Joe Miller, Xiaobo Yu, Paula K. Yu, Stephen J. Cringle, Dao-Yi Yu, Univ. of Western Australia (Australia) [7004‑160]
Optical fibre delivery of 213 and 266nm laser radiation for the precise and controllable ablation of ocular tissue. The parameters required for ablation and the maximum system capability are reported.
| Coffee/Tea break | Thu. 10:30 - 11:00 |
SESSION ThB: Physical, Mechanical, and Electromagnetic Sensors II
| Room: Sirius Room | Thu. 11:00 - 12:30 |
11:00: Fiber optic flow velocity sensor based on an in-fiber integrated Michelson interferometer, Libo Yuan, Harbin Engineering Univ. (China) [7004‑16]
A novel fiber optic flow velocity sensor based on a twin-core fiber Michelson interferometer has been proposed and demonstrated. This twin-core fiber sensing technique could automatically compensate the variation of environmental temperature and pressure.
11:15: Optical fiber sensor cable for pipe thinning detection in high-temperature environment conditions, Shimei Tanaka, Kazunaga Kobayashi, Tsuyoshi Shimomichi, Yoshikazu Nomura, Fujikura Ltd. (Japan); Kinzo Kishida, Che-Hsien Li, Yoshiaki Yamauchi, Neubrex Co., Ltd. (Japan); Hiroaki Suzuki, Chiyoda Advanced Solutions Corp. (Japan) [7004‑138]
We developed the heat-resistant optical fiber sensor cable, exhibiting excellent sensitivity to local strain variations. The strain measurements acquired by means of the cable was used in 3D structural analysis, allowing us to detect pipeline wall thinning with high accuracy.
11:30: Passive and active optical sensing system for monitoring partial discharge on hydrogenerators, Joao B. Rosolem, Claudio Floridia, Maria do Rosario F. Hurtado, Jose Antonio D. Rossi, Antonio A. Juriollo, CpqD Foundation (Brazil); Jacques Philippe M. Sanz, Eletronorte S.A. (Brazil) [7004‑26]
We present a hydrogenerator partial discharge sensing system based in RF/Optical technology developed to obtain non-intrusive and large bandwidth characteristics. It was tested using hydrogenerator stator bars and showed a very good performance.
11:45: Hybrid LPFG/MEFPI sensor for simultaneous measurement of high temperature and strain, Yun-Jiang Rao, ZengLing Ran, Xian Liao, Hong-You Deng, Univ. of Electronic Science and Technology of China (China) [7004‑70]
A hybrid fiber-optic sensor consisting of a long-period fiber grating (LPFG) and a micro extrinsic Fabry-Perot interferometric sensor is proposed and demonstrated for simultaneous measurement of high-temperature and strain.
12:00: Lab tests of an all-fibre voltage sensor system, Andrew M. Michie, The Univ. of Sydney (Australia) [7004‑270]
All fibre voltage sensing using helically coiled lengths of thermally poled twin-hole silica optical fibre is presented.Preliminary lab system test results are presented.
12:15: How sensitive is the fibre laser strain sensor?, Scott B. Foster, Defence Science and Technology Organisation (Australia); Geoffrey A. Cranch, Naval Research Lab.; Alexei E. Tikhomirov, Defence Science and Technology Organisation (Australia) [7004‑116]
We compare the frequency noise of a number of distributed feedback fibre laser sensors and find that all exhibit similar 1/f noise which limits sensitivity below 10kHz. Current theories of noise are reviewed.
Lunch break (Food/menus to be decided)
| Room (for Delegates): Atrium Garden Restaurant | Thu. 12:30 - 14:00 |
| Room (for Steering Committee): Mussel bar Fremantle | Thu. 12:30 - 14:00 |
SESSION ThC: Distributed Sensing
| Room: Sirius Room | Thu. 14:00 - 15:30 |
14:00: Using dispersion decreasing fiber to generate pulse delay and compensate the pulse distortion, Xiaoyi Bao, Univ. of Ottawa (Canada); Wenhai Li, Liang Chen, Univ. of Ottawa (Canada) [7004‑30]
Dispersion effect in stimulated Brillouin scattering slow light is studied to compensate the pulse distortion using SBS dispersion decreasing fiber and a minimum pulse distortion with high delay of 1.8ns over 2ns pulse was demonstrated.
14:15: Highly sensitive reflectometry over 20 km with submeter spatial resolution based on phase-noise-compensated optical frequency domain reflectometry and concatenative reference method, Xinyu Fan, Yusuke Koshikiya, Fumihiko Ito, NTT Access Network Service Systems Labs. (Japan) [7004‑56]
Highly sensitive reflectometry over 20 km with a sub-meter spatial resolution based on phase noise compensated optical frequency domain reflectometry and the concatenative reference method is proposed and demonstrated experimentally.
14:30: Proposal and experiment of BOCDR: Brillouin optical correlation-domain reflectometry, Yosuke Mizuno, Weiwen Zou, Zuyuan He, Kazuo Hotate, The Univ. of Tokyo (Japan) [7004‑122]
We propose Brillouin optical correlation-domain reflectometry (BOCDR), which can realize high spatial resolution, much faster measurement and random access to measuring position, simultaneously. A 40-cm spatial resolution was experimentally demonstrated with 50-Hz sampling rate.
14:45: Distributed fiber sensing using Brillouin echoes, Luc Thevenaz, Stella Foaleng Mafang, Ecole Polytechnique Fédérale de Lausanne (Switzerland) [7004‑236]
A simple physical description of the nonlinear optical interaction based on Brillouin echoes is presented. This technique makes potentially possible distributed Brillouin sensing down to centimeter spatial resolution while preserving the narrowband feature of the natural Brillouin gain spectrum. Experimental conditions for the generation of Brillouin echoes are described and demonstrations of distributed measurements using a 1 ns (10 cm) pulse are presented.
15:00: Wavelength sensitive time-domain interrogating system for a quasi-distributed temperature sensor, Cathy I. Crunelle, Marc Wuilpart, Christophe Caucheteur, Patrice Mégret, Faculté Polytechnique de Mons (Belgium) [7004‑193]
Quasi-distributed temperature monitoring system where a concatenation of identical low reflective FBG's is interrogated by an OTDR, extended by a wavelength sensitive system to allow the detected peaks height to depend on the transmitted wavelength
15:15: Multipoint fiber optic based corrosion sensor, Joaquim F. Martins Filho, Eduardo Fontana, Jairon Guimarães, Univ. Federal de Pernambuco (Brazil); Isnaldo J. Souza Coêlho, Univ. Federal do Vale do São Francisco (Brazil) [7004‑43]
We present an optical fiber sensor for the corrosion process in metal (Aluminum) using the optical time domain reflectometry (OTDR) technique. We present experimental results for the measurement of the corrosion rate of aluminum films in controlled laboratory conditions and also for the evaluation of the maximum number of sensor heads the system supports. Our proposed sensor system is multipoint, self-referenced, has no moving parts and can detect the corrosion rate for each head several kilometers away from the OTDR. This system may have applications in harsh environments such as in deepwater oil wells, for the evaluation of the corrosion process in the inner wall of the casing pipes.
| Coffee/Tea break | Thu. 15:30 - 16:00 |
SESSION ThD: Passive and Active Devices for Photonic Sensing
| Room: Sirius Room | Thu. 16:00 - 17:15 |
16:00: Two-wave mixing-based optical fiber sensor, Stéphanie Molin, Thales Research & Technology (France) and Thales Underwater Systems S.A.S. (France); Edouard Grellier, Daniel Dolfi, Jean-Pierre Huignard, Thales Research & Technology (France); Martine Doisy, Thales Underwater Systems S.A.S. (France) [7004‑81]
A new concept of optical fiber dynamic strain sensor has been theoretically studied and its proof of principle experimentally demonstrated. It is based on two wave mixing by gain saturation in an optically pumped erbium doped optical fiber.
16:15: Wide and fast wavelength-swept mode-locked fiber laser based on dispersion tuning and its application to dynamic FBG sensing, Yuichi Nakazaki, Shinji Yamashita, The Univ. of Tokyo (Japan) [7004‑123]
We demonstrate a wide and fast wavelength-swept mode-locked fiber laser based on dispersion tuning and its application to dynamic FBG sensing. This system enables dynamic measurement of strain in real-time at a high measurement rate.
16:30: Measurement of Bragg wavelength distribution in a long-length fiber Bragg grating by synthesis of optical coherence function, Kazuo Hotate, Koji Kajiwara, The Univ. of Tokyo (Japan) [7004‑108]
A sensor system for measuring continuous Bragg wavelength distribution in a long-length fiber Bragg grating is newly proposed and implemented, based on the technique of synthesis of optical coherence function. Experimental results and simulations are comparatively examined.
16:45: All-optical dynamic grating generation based on Brillouin scattering in polarization maintaining fiber, Kwang-Yong Song, Chung-Ang Univ. (South Korea); Kazuo Hotate, The Univ. of Tokyo (Japan) [7004‑219]
We report a novel kind of all-optical dynamic grating based on Brillouin scattering in polarization maintaining fiber (PMF). A 3-dB bandwidth of ~100 MHz is observed with the tunable reflectivity of up to 2% in a 30 m PMF.
17:00: Surface strain measurement of rotating objects using shearography instrumentation based on fibre optic imaging bundles, Dan Francis, Stephen W. James, Ralph P. Tatam, Cranfield Univ. (United Kingdom) [7004‑259]
The use of fibre optic imaging bundles to facilitate the development of a multi-component digital shearography instrument capable of quantitative full-field surface strain measurement on rotating objects is described.
Posters-Thursday
| Room: Orion/Pleiades Room | Thu. 17:15 - 19:00 |
Post-deadline papers
| Room: Sirius Room | Thu. 19:00 - 20:00 |
Friday 18 April
SESSION FA: Polymer/Structured Fibers
| Room: Sirius Room | Fri. 9:00 - 10:30 |
9:00: Single-mode polymer optical fiber sensors for high-strain applications (Invited Paper), Sharon Kiesel, Kara J. Peters, Tasnim Hassan, Mervyn Kowalsky, North Carolina State Univ. [7004‑54]
We demonstrate the measurement of the phase shift in a polymethylmethacrylate single-mode optical fiber interferometer, operating at a wavelength of 632.8 nm, up to 15.8% nominal strain in the fiber.
9:30: The role of material properties in the strain testing using microstructured polymer optical fibres (mPOF), Maryanne C. J.Large, Joshua Moran, Lin Ye, The Univ. of Sydney (Australia) [7004‑118]
We consider the role of stress and strain in the performance of mechanical sensors in polymer fibres. We also show that the viscoelastic properties of polymers cause important time-dependent effects.
9:45: A POF-based distributed strain sensor for detecting deformation of wooden structures, Takuji Fukumoto, Kentaro Nakamura, Sadayuki Ueha, Tokyo Institute of Technology (Japan) [7004‑66]
A method for detecting deformations in wooden structures with a POF-based distributed sensor is described. Strains at four corners of the structure were successfully detected after releasing the external force using the memory effect.
10:00: Photonic bandgap fiber optical correlation spectroscopy gas sensor, Adriaan Van Brakel, Ed Austin, Christos Grivas, Marco Petrovich, Univ. of Southampton (United Kingdom); David Richardson, Univ. of Southamtpon (United Kingdom) [7004‑199]
We present results obtained from the first all-fiber optical correlation spectroscopy gas sensor for acetylene. In our sensor, hollow-core photonic bandgap fiber (PBGF) is employed to contain all gas samples required for optical absorption measurements.
10:15: The inner cladding mode in a photonic crystal fiber for temperature and refractive index independent strain sensing applications, Chengkun Chen, Albane Laronche, Carleton Univ. (Canada); Géraud Bouwmans, Laurent Bigot, Yves Quiquempois, Univ. des Sciences et Technologies de Lille (France); Jacques Albert, Carleton Univ. (Canada) [7004‑208]
Inner cladding modes in photonic crystal fiber are insensitive to surrounding index changes. By tracking the inner cladding mode resonance shift relative to the core mode, temperature and index insensitive strain sensors can be made.
| Coffee/Tea break | Fri. 10:30 - 11:00 |
SESSION FB: Sensor Systems
| Room: Sirius Room | Fri. 11:00 - 12:30 |
11:00: Ultralong-distance (230-km) FBG sensor system (Invited Paper), Takanori Saitoh, Kenichi Nakamura, Yoshifumi Takahashi, Hiroyuki Iida, Yoshimitsu Iki, Koichiro Miyagi, Anritsu Corp. (Japan) [7004‑144]
An ultra-long-distance Fiber Bragg Grating (FBG) sensor system using a swept-wavelength light source, Er-doped fiber amplifier, and optical switch is proposed. This system can measure reflection wavelengths of FBGs located at a distance of 230km.
11:30: Optical system with potential for remote health monitoring of subsea machinery, David A. Jackson, Univ. of Kent (United Kingdom) [7004‑23]
An optical system is presented for monitoring the health of subsea motors via spectral analysis of the stators 3 phase drive currents and the relative phases of these currents; and vibration induced bearing damage.
11:45: A novel wide-angle laser triangulation method for obstacle detection, Kaveh Sahba, Edith Cowan Univ. (Australia) [7004‑247]
Indoor active triangulation to laser spots generated by quasi-cylindrical cavity is demonstrated. Principal ray trajectory is modeled using a system of linear equations and fundamental ray geometry. Each ray’s unique outgoing angle and baseline is calculated and used to derive the range to the corresponding spot. Above 98% accuracy is achieved over an approximate range of 5m, demonstrating a novel motionless laser scanning technique with a wide scanned angle and no moving parts.
12:00: Monitoring of flexible oil lines using FBG sensors, Sergio Morikawa, Claudio Camerini, Daniel Pipa, Joao Santos, Gustavo Pires, Petroleo Brasileiro S.A. (Brazil); Robert Llerena, Alexandre Ribeiro, Arthur M.Braga, Pontifícia Univ. Católica do Rio de Janeiro (Brazil) [7004‑155]
Integrity assurance of structures, equipment, and flow lines plays a major role in maximizing offshore production systems availability. In this context, optical fiber sensors offer an attractive alternative to traditional sensing technologies.
12:15: Underwater blast loading of a composite twisted rudder with FBGs, Mark Seaver, Stephen T. Trickey, Naval Research Lab. [7004‑181]
FBGs were embedded and surface mounted on a full size composite twisted rudder. Data were successfully collected at data rates to 9800 Hz with strains near 4000 me and strain rates to 13 e/s.
12:30 - 12:45: conference closing session
12:45 - 13:30: Light lunch and refreshment
End of conference