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)
Tuesday 15 April
Posters-Tuesday
| Room: Pleiades/Orion Room | Tue. 17:30 - 19:00 |
Self-referenced Fizeau strain sensors based on an electronic scanning mirror, Jiang Yu, Jianzhong Zhang, Jun Yang, Weimin Sun, Libo Yuan, Harbin Engineering Univ. (China); G. D. Peng, Univ. of New South Wales (Australia) [7004-03]
A self-referenced fiber optic Fizeau strain sensor based on Michelson interferometry with a electronic scanning mirror is proposed and demonstrated. The limitation of Fizeau cavity length is eliminated and it is possible to multiplex Fizeau strain sensors with the same cavity length. The return-error caused by the scanning mirror is reduced dramatically by introducing the reference signal.
Crosstalk analysis of a smart sensor unit based on FBG and FOWLI, Jiang Yu, Jianzhong Zhang, Weimin Sun, Libo Yuan, Harbin Engineering Univ. (China); G. D. Peng, Univ. of New South Wales (Australia) [7004-04]
The effective optical path method is proposed to analyze the measurement crosstalk of a smart fiber optic sensor unit based on multiplexing fiber Bragg gratings (FBG) and fiber optical white light interferometry (FOWLI). According to the analysis, the crosstalk between FBG and FOWLI can be estimated. The experimental system with a sensor unit is given to show the feasibility of the multiplexing scheme.
A passive way to extend DTSS system distance, Yan Dong Gong, Jianzhong Hao, Michael O. L.Chuen, Varghese Paulose, A*STAR Institute for Infocomm Research (Singapore) [7004-07]
A sensing fiber is proposed, which has a gradually increasing Brillouin or Raman gain-coefficient along its length, which can keep the received Stoke’s power constant and can further extend the sensing distance in a DTSS.
Revolutionizing the design of an evanescent-wave-based fiber optic fluorometer, Jianjun Ma, Wojtek J. Bock, Univ. du Québec en Outaouais (Canada) [7004-09]
We demonstrate that the newly proposed side-excited evanescent-wave fiber-optic fluorometer (EWFOF) is superior to a conventional two-end access EWFOF. The observed spectrum shows significantly enhanced signal level and very weak stray Ex light.
Fusion of a FBG-based health monitoring system for wind turbines with a fiber optic lightning detection system, Sebastian G. M.Kraemer, Benjamin Wiesent, Mathias S. Mueller, Fernando Puente Leon, Technische Univ. München (Germany); Yaru Mendez Hernandez, GE Global Research (Germany) [7004-10]
Based on two separately existing concepts for strain measurements and lightning detection on wind turbines, a fused system is presented. To prove the feasibility of this fusion on one fiber, interferences between both sensor systems are investigated and evaluated.
Fiber optic carbon dioxide sensor based on fluorinated xerogels doped with HPTS, Yu-Lung Lo, Chen-Shane Chu, National Cheng Kung Univ. (Taiwan) [7004-11]
This paper presents a high-performance fiber-optic carbon dioxide (CO2) sensor based on hybrid xerogels composed of alkyl and perfluoroalkyl ORMOSILs (organically modified silicates) doped with pH-sensitive fluorescent dye.
A plastic optical fiber sensor for dual sensing on temperature and oxygen, Yu-Lung Lo, Chen-Shane Chu, National Cheng Kung Univ. (Taiwan) [7004-12]
We present a low-cost plastic optical fiber sensor for the dual sensing of temperature and oxygen. The temperature and oxygen indicators are both excited using a LED light source with a wavelength of 380 nm.
Two beams optical tweezers built by a two-core fiber, Libo Yuan, Harbin Engineering Univ. (China) [7004-14]
We present an abruptly tapered two-core fiber optical tweezers, which is fabricated by fusing and drawing the two-core fiber. By using this two beams combined technique, a strong enough gradient forces well is obtained for microscopic particles trapping in three-dimensional.
Three-core fiber far-field structured light pattern generator and its shape sensing application, Libo Yuan, Harbin Engineering Univ. (China) [7004-15]
By using spherical designed three-core fiber, a micro structured light pattern generator for sensing of 3-D object shapes has been demonstrated. The use of fiber optic grid interferogram technique greatly simplifies the holographic interferometry system.
High-temperature sensors exploiting low-coherence signal recovery, David A. Jackson, Univ. of Kent (United Kingdom) [7004-17]
High temperature probes a) based on a sapphire etalon with signal recovery by modified coherence tracking, maximum temperature 1000C and b) miniature Fabry-Perot with signal recovery by a fast tuneable laser, maximum temperature 700C are presented
Antiresonant guiding photonic crystal fibers, Jian Sun, Chi Chiu Chan, Yifan Zhang, Ping Shum, Nanyang Technological Univ. (Singapore) [7004-18]
Refractometric sensor utilizing spectral properties of antiresonant guiding photonic crystal fibers is proposed. The sensor operation is based on the wavelength shift of the transmission spectrum with respect to the change of refractive index inside the air holes of the photonic crystal fibers. Both numerical and experimental analyses are carried out to investigate the spectral characteristics.
Maximum-intensity-projection images for dynamic analysis of mental sweating by optical coherence tomography, Hiroyuki Saigusa, Yoshihiro Ueda, Akihiro Yamada, Masato Ohmi, Masamitsu Haruna, Osaka Univ. (Japan) [7004-19]
We demonstrate a novel 3-D image construction method with maximum intensity projection (MIP) of B-mode images obtained by the swept-source OCT. The time-sequential MIP images with a frame spacing of only 0.7 sec are obtained to make dynamic analysis of mental sweating on human fingertips.
Characteristics of a cavity ring-up gas amplified fiber loop, Na Ni, Julian Chan, Jian Sun, Li Xia, Nanyang Technological Univ. (Singapore) [7004-20]
A novel concept of cavity ring-up (CRU) spectroscopy is proposed for trace gas detection in an amplified fiber loop. Based on a rate equation approach, the time-evolving CRU signals in the fiber gas sensing loop are studied. The features of CRU output signals are numerically simulated and discussed. Those systemical studies and theoretical analyses will guide the future design of the fiber cavity ring-up gas sensing system.
DFB laser injection locking on Brillouin radiation for probe Stokes generation in distributed fiber optical sensing, Vasily Spirin, Marcial Castro, Ctr. de Investigación Científica y de Educación Superior de Ensenada (Mexico) [7004-24]
We report two novel optical injection-locking configurations of DFB laser without high-frequency modulator for probe Stokes signal generation in distributed fiber optical Brillouin sensing.
Twin-core fiber white light interferometric bending sensor, Libo Yuan, Harbin Engineering Univ. (China) [7004-25]
A fiber optic bending sensing system that uses twin-core fiber as the sensing element has been proposed and demonstrated. The relationship between the bending curvature and the shift of the unique identification spectrum has been given.
Multiple wavelengths Raman fibre laser with asymmetric cavities, Swook Hann, Korea Photonics Technology Institute (South Korea); Young-Eun Im, Gwangju Institute of Science and Technology (South Korea); Dong-Hwan Kim, Korea Photonics Technology Institute (South Korea); Chang-Soo Park, Gwangju Institute of Science and Technology (South Korea) [7004-29]
A low-cost Raman fibre laser for multiple wavelengths at 14xx nm has been proposed and demonstrated. Using asymmetric cavities, the Raman fibre laser provides flexible and easy complete solution of the desired multiple wavelengths output.
A wavelength swept laser with the sweep rate of 150 kHz using vibrations of optical fiber, Ryoichi Isago, Kentaro Nakamura, Sadayuki Ueha, Tokyo Institute of Technology (Japan) [7004-32]
We propose a high-speed wavelength swept light source using a vibration of an optical fiber and an external cavity laser. A sweep rate of 167 kHz was achieved for the sweep range of 70 nm.
A high reading rate FBG sensor system using a high-speed swept light source based on fiber vibrations, Ryoichi Isago, Kentaro Nakamura, Sadayuki Ueha, Tokyo Institute of Technology (Japan) [7004-36]
We propose an FBG sensor system using a high-speed swept light source based on a vibrating optical fiber. Measurements of a 10-kHz vibratory strain were demonstrated with a sufficient sampling rate of 172 kHz.
Detection of submillimeter faults with a time domain distributed Brillouin sensor, Fabien Ravet, Fabien Briffod, Omnisens S.A. (Switzerland); Branko Glisic, Smartec S.A. (Switzerland); Marc Nikles, Omnisens S.A. (Switzerland); Daniele Inaudi, Smartec S.A. (Switzerland) [7004-37]
Sub-millimeter crack is detected with a dedicated fiber optic strain cable, a 1 m spatial resolution distributed Brillouin sensor and an advanced signal processing technique.
Effect of temperature on Brillouin gain spectrum and aging behavior in carbon/polyimide coated fiber, Chunshu Zhang, Xiaoyi Bao, Wenhai Li, Liang Chen, Univ. of Ottawa (Canada); Mei Du, OFS Fitel, LLC [7004-39]
The effects of temperature on the Brillouin spectrum in novel carbon/polyimide coated fibers have been firstly studied. We also firstly investigated the aging behavior for these fibers by comparing the changing of the relationship between Brillouin frequency shift and temperature.
Optimization design of the pressure phase sensitivity of the fiber optic air-backed mandrel hydrophone, Kai Yin D.V.M., Hongpu Zhou, Min Zhang, Tianhuai Ding, Liwei Wang, Yanbiao Liao, Tsinghua Univ. (China) [7004-44]
In this work, A general three-dimensional theoretical model is carried out and the orthogonal experimental method has been used to optimize the design of the pressure phase sensitivity of the fiber-optic air-backed mandrel hydrophone.
Optically powered DFB fiber laser magnetometer, Geoffrey A. Cranch, Naval Research Lab.; Gordon M. H.Flockhart, SFA, Inc.; Clay K. Kirkendall, Naval Research Lab. [7004-46]
An optically powered DFB fiber laser based magnetometer free from hysteresis, incorporating drift compensation is demonstrated. Optical power is delivered through a dedicated fiber to provide the required dither current yielding an electrically passive sensor.
Amplified CWDM self-referencing sensor network based on phase-shifted FBGs in transmissive configuration, Cesar Elosua, Rosa A. Perez-Herrera, Manuel Lopez-Amo, Candido Bariáin, Univ. Pública de Navarra (Spain); Raimundo Garcia-Olcina, Salvador Sales, Jose Capmany, Univ. Politécnica de Valencia (Spain) [7004-48]
A new amplified CWDM (Coarse Wavelength Division Multiplexing) self-referencing sensors network using phase-shifted fiber Bragg gratings (PS-FBGs) is experimentally demonstrated. Remote sensing is achieved by amplification at the interrogation header, using highly doped erbium fiber.
Highly accurate microdisplacement measurement based on Gaussian-chirped tilted fiber Bragg grating, Tuan Guo, Jacques Albert, Chengkun Chen, Alexei Ivanov, Albane Laronche, Carleton Univ. ( Canada) [7004-52]
Intensity-referenced and temperature-independent displacement measurement is demonstrated by using a Gaussian-chirped tilted fiber Bragg grating. Improved resolution of 1×10-3 mm and thermal fluctuation < 2% for temperature range of 0~80°C are achieved.
Radiation mode resonances of tilted fiber Bragg gratings for high-index media measurement, Chengkun Chen, Tuan Guo, Albane Laronche, Jacques Albert, Carleton Univ. (Canada) [7004-53]
We demonstrate experimentally how the radiation mode resonances of tilted fiber Bragg gratings can be used to monitor refractive indices larger than the fiber cladding index (past the cladding mode cutoff), and measure their sensitivity.
Detection of micrometer crack by Brillouin-scattering-based distributed strain and temperature sensor, Lufan Zou, OZ Optics Ltd. (Canada); Maria Q. Feng, Univ. of California/Irvine [7004-55]
The existence of cracks and their locations are identified by measuring the strain distribution on a sensing fiber bonded on the ceramic surface using a Brillouin-scattering-based distributed strain and temperature sensor for the first time.
Fibre Bragg grating use in fluid dynamic studies, Scott A. Wade, Mehdi Nazarinia, Siong B. Wong, David Lo Jacono, Monash Univ. (Australia) [7004-58]
The use of fibre Bragg gratings for fluid dynamics measurement in a flow tank have been investigated.
Wavelength domain interrogation of polarimetric temperature sensor based on polarization maintaining fiber, Yuanhong Yang, Tong Shen, Jinjin Guo, Beihang Univ. (China); Wei Jin, The Hong Kong Polytechnic Univ. (China) [7004-59]
A wavelength domain technique based on the detection of peak wavelength in the interference pattern was proposed and applied to a reflection type polarimetric temperature sensor made of polarization maintaining fibers. The measurement equation that relates the temperature variation linearly to the shift of the peak wavelength in the interference pattern was derived. An experimental sensor was setup to verify the effectiveness and the accuracy of the detection technique over an applied temperature range from -40deg to 80deg. Experimental results agree well with theoretical prediction.
Shot-noise limited fiber laser source for sensing applications, Jong H. Chow, Tim T. Y.Lam, Ian C. M.Littler, David E. McClelland, Malcolm B. Gray, The Australian National Univ. (Australia) [7004-60]
We propose active feedback frequency locking of a single longitudinal mode fiber laser to passive, high Q fiber ring cavities, for filtering excess relative intensity noise, thereby producing shot-noise limited light source for sensing applications.
Optical fiber temperature sensor using a thin film band pass filter and dual wavelength push-pull reflectometry, Yasutoshi Komatsu, Seiichi Onoda, Kiichi Inoue, Masayuki Nakano, Watanabe Co., Ltd. (Japan) [7004-62]
An experimental temperature sensing system using dual wavelength push-pull reflectometry and a thin-film band pass filter deposited on an optical fiber end face is presented. Obtained accuracy is better than ±0.5°C.
Miniature in-line photonic crystal fiber etalon fabricated by 157-nm laser micromachining, Zeng Ling Ran, Yun-Jiang Rao, Hong-You Deng, Xian Liao, Univ. of Electronic Science and Technology of China (China) [7004-63]
An in-line fiber-optic Fabry-Perot etalon sensor for high-temperature applications is fabricated on a photonic-crystal-fiber (PCF) by using 157nm laser micromachining, which has an excellent fringe visibility of up to ~26dB.
Fiber Bragg grating based on nanostructure core fiber, Xia Yu, Ping Shum, Nanyang Technological Univ. (Singapore) [7004-64]
We report a fiber Bragg grating using a novel silica based nanostructure core fiber formed with a 2D periodic lattice of high index rods. The temperature and strain sensitivities have been obtained experimentally.
Pressure and temperature characterization of Bragg gratings in grapefruit microstructured optical fibers, Bai-Ou Guan, Da Chen, Yang Zhang, Dalian Univ. of Technology (China); Zhi Wang, Bo Liu, Nankai Univ. (China) [7004-65]
We report on the pressure characterization of Bragg gratings in grapefruit microstructured fibers. The air holes enhance the pressure response. The effect of air expansion in the holes on temperature response was also investigated.
Laser-micromachined Fabry-Perot fiber optic tip sensor for temperature-independent measurement of refractive index, Zeng Ling Ran, Yun-Jiang Rao, Wei-Jun Liu, Xian Liao, Kin-Seng Chiang, Univ. of Electronic Science and Technology of China (China) [7004-69]
A Fabry-Perot fiber-optic tip sensor for refractive-index measurement is proposed and demonstrated, which can provide temperature-independent measurement of practically any refractive index larger than that of air and offers a refractive-index resolution of ~4×10-5.
Technique for estimating the tuning speed of fiber Bragg gratings, Alexandre A. P.Pohl, Univ. Tecnológica Federal do Paraná (Brazil); John Canning, Michael Stevenson, The Univ. of Sydney (Australia); Nathaniel Groothoff, The Univ. of Sydney (Austria); Paulo de Tarso Neves, Jr., Roberson A. Oliveira, Univ. Tecnológica Federal do Paraná (Brazil) [7004-72]
A technique is reported for estimating the tuning speed of a fiber Bragg grating which is based on accessing the wavelength shift through a calibration curve and measuring the time in which the shift occurs.
Development of an improved extrinsic fiber Fabry-Perot for temperature sensing, Seyed H. Aref, Shahid Beheshti Univ. (Iran) [7004-73]
This work presents an improved fiber optical temperature sensor based on an extrinsic fabry-perot interferometric fiber sensor. The fabrication of the EFPI sensor has been done by CO2 laser fusion bonding. We improved our signal processing method by using mass central method.
Generation of ultranarrow sensing filters using cross polarisation in a linear SOI photonic crystal waveguide, John Canning, The Univ. of Sydney (Australia); Martin Kristensen, Nina Skivesen, Amélie Têtu, Cicero Martelli, Åarhus Univ. (Denmark) [7004-74]
A narrow band (3dB bandwidth < 2 nm) transmission notch filter based on polarisation conversion within a photonic crystal waveguide is demonstrated. Signal contrast between quasi- TE and TM eigenstates reaching 40dB is achieved. Further, multiple resonant wavelength coupling between the two eigenstates is also observed. These offer a novel alternative approach to sensing and biodiagnostics compared to previous use of the band edge of a photonic crystal waveguide.
Rotational dependence of laser light accessing photonic crystal fibre cores from the side, John Canning, The Univ. of Sydney (Australia); John Holdsworth, The Univ. of Newcastle (Australia); Chris Dewhurst, The Univ. of Sydney (Australia) [7004-275]
We investigate the fluorescence of an Er-doped aluminosilicate stepped index core with surrounding structured lattice when pumped transversely with the collimated output of a 980nm diode. A small rotational dependence is observed indicating the importance of cladding structure alignment during experiments that involve processing the core from the side, including Bragg grating writing.
Fabrication and test of high-pressure sensor with high-pressure sensitivity and improvement in temperature compensation, Seyed H. Aref, Shahid Beheshti Univ. (Iran) [7004-75]
We report on a fabrication of high pressure extrinsic fabry-perot interferometric fiber sensor. The temperature cross sensitivity problem has been solved by replacing the reflecting fiber with a metal micro wire in the EFPI. we improved the mechanical transducer, EFPI fabrication method, and signal processing for air gap reading.
Strain sensor using phase measurement techniques in polymer optical fibers, Alexander Bachmann, Michael Luber, Hans Poisel, Olaf Ziemann, Univ. of Applied Sciences Nürnberg (Germany) [7004-78]
POF elongation sensors have been proposed e.g. by [1] as a low-cost alternative to FBG (single mode fiber bragg gratings) sensors targeting the lower sensitivity range. A recently recovered detection system known from laser distance meters turned out to be very sensitive while staying simple. The approach is based on measuring the phase shift of a sinusoidally modulated light signal guided in a POF under different tensions resulting in different transit times and thus different phase shifts.
Highly sensitive optical refractometer based on edge-written ultralong-period fiber grating formed by periodic grooves, Yun Song, Yun-Jiang Rao, Tao Zhu, Cuihua Shi, Chongqing Univ. (China) [7004-79]
An ultra-long-period fiber grating with periodic groove structure carved by high frequency CO2 laser pulses is reported, which has highly refractive index sensitivity compared with conventional long period grating because of its unique groove structure.
Development of borehole multiple deformation sensor system, Yoshio Kashiwai, Taisei Kiso Sekkei Co., Ltd. (Japan) [7004-82]
The multiple deformation sensor system for 66mm diameter borehole and for 9 measurement sections is developed based on the FBG sensor technology, and applied for the monitoring of base rock of Horonobe Underground Research Laboratory.
Bi2O3-based erbium-doped fiber laser with over 110-nm tunable range for fiber sensor sources, Seiki Ohara, Asahi Glass Co., Ltd. (Japan) [7004-85]
We demonstrated tunable fiber ring laser using Bi2O3-based Erbium doped fiber and a tunable filter for fiber sensor light sources. It shows tunable range over 110 nm, and optical signal-to-noise ratio higher than 70 dB.
Polarimetric implementation of a low-loss interferometric sensor array, Avishay Eyal, Amit Isseroff, Ariel Oni, Erez Raanan, Moshe Tur, Tel Aviv Univ. (Israel) [7004-91]
A low-loss polarimetric sensor array, comprising a cascade of five polarization maintaining fibers and a novel peeling algorithm, is experimentally demonstrated. With one segment buried in a sand box, the array successfully detected pressure variations.
Sensing and splicing applications of small core Ge-doped photonic crystal fibers, Yiping Wang, Sven Brueckner, Jens Kobelke, Manfred Rothhardt, Wolfgang Ecke, Reinhardt Willsch, Hartmut Bartelt, IPHT Jena (Germany) [7004-92]
Fiber Bragg grating with 35% reflectivity and 5.6pm/ºC sensitivity was written in small core Ge-doped photonic crystal fiber(PCF) before hydrogen loading. The PCF was spliced to various SMFs by commercial splicer with default parameters.
Crack detection in reinforced concrete beam by using of distributed Brillouin fiber sensor, Chunshu Zhang, Xiaoyi Bao, Wenhai Li, Liang Chen, Amre Deif, Univ. of Ottawa (Canada); Bruno Cousin, Univ. Montpellier II (France); Beatriz Martín-Pérez, Univ. of Ottawa (Canada) [7004-93]
We conducted a strain characterization experiment to detect concrete beam cracks using distributed Brillouin sensor system. An accurate Brillouin multiple-peak fitting method is used to enhance the spatial and strain resolution. This allows us to exactly extract the distributed strain section that is smaller than the spatial resolution of the Brillouin sensor system.
Concrete pavement vibration monitoring due to the car passing using optical fiber sensor, Ziyi Zhang, Samuel LeBlanc, Xiaoyi Bao, Univ. of Ottawa (Canada) [7004-94]
An optical fiber vibration/acoustic sensor based on polarization diversity scheme has been developed to study the vibration of the highway pavement slabs with vehicles passing. This process induced the birefringence change in a 50m sensing fiber embedded along the FRP bars. The damping of the impact in time domain and a 2Hz vibration frequency are observed.
Performance improvement of a cascaded tapered long period grating refractometer by using nanosized high-refractive-index coatings, Pierluigi Pilla, Pierluigi Foglia Manzillo, Univ. degli Studi del Sannio (Italy); Michele Giordano, Consiglio Nazionale delle Ricerche (Italy); Michael L. Korwin-Pawlowski, Wojtek J. Bock, Univ. du Québec en Outaouais (Canada); Andrea Cusano, Univ. degli Studi del Sannio (Italy) [7004-96]
Nano-sized high refractive index polymeric coatings were used to induce the modal transition in cascaded tapered long period gratings to the aim of increasing the sensitivity of the bare device to surrounding refractive index changes.
Bragg fiber-based surface plasmon resonance sensor, Bertrand Gauvreau, Alireza Hassani, Maksim A. Skorobogatiy, Ecole Polytechnique de Montréal (Canada) [7004-98]
The computer assisted design of photonic crystal Bragg fiber-based plasmonic sensors is demonstrated. Dispersion relation tailoring allows plasmon excitation to take place at any wavelength of choice from the visible to near infrared.
Highly efficient fluorescence sensing using microstructured optical fibres: side-access and thin-layer configurations, Stephen C. Warren-Smith, Shahraam Afshar, Tanya M. Monro, The Univ. of Adelaide (Australia) [7004-99]
A theoretical model for evaluating the performance of a fluorescence-based MOF sensor is presented with numerical results shown for two significant sensing configurations with subwavelength features; a side-access and a thin-layer sensor.
Simultaneous measurement for temperature and strain by use of Sagnac interferometer with controlled sensitivity, Guoyong Sun, Youngjoo Chung, Gwangju Institute of Science and Technology (South Korea) [7004-100]
We propose a novel approach for resolving temperature and strain variations by use of Sagnac interferometer incorporating two types of high birefringence fibers (HBFs) and a polarization controller. The two types of HBFs are spliced together to act as the sensing head for temperature and strain discrimination. The detected parameters are two wavelength dips over a broad wavelength range in the transmission spectrum of the Sagnac interferometer, whose sensitivity responses to temperature and strain both depend on those of the two HBFs. As a result, the sensitivity responses can be controlled by adjusting the polarization controller adjacent to the sensing head to shift the wavelength dips and then change their degrees of dependence on the two HBFs.
Structure optimization of air-hole fibers for high-sensitivity fiber Bragg grating pressure sensors, Kevin P. Chen, Charles Jewart, Di Xu, Univ. of Pittsburgh; John Canning, The Univ. of Sydney (Australia) [7004-102]
Sensitivity enhancement of FBG pressure sensors written in two hole fibers was achieved by optimize the size, geometry, and configuration of air hole and fiber.
Self-referenced fiber microbend displacement sensor based on dual-wavelength fiber Bragg gratings interposed with a multimode fiber microbender, Xiufeng Yang, Varghese Paulose, Lie Yong Teo, Zhihao Chen, Jun-Hong Ng, A*STAR Institute for Infocomm Research (Singapore) [7004-103]
A self-referenced multimode fiber (MMF) microbend displacement sensor is presented by incorporated two fiber Bragg gratings (FBGs) with different wavelengths. A piece of MMF between the two FBGs acts as the sensing part.
Suppression of polarization sensitivity in BOTDA fiber distributed sensing system, Jing Yang, Changyuan Yu, National Univ. of Singapore (Singapore); Zhihao Chen, Junhong Ng, Xiufeng Yang, A*STAR Institute for Infocomm Research (Singapore) [7004-106]
We propose a technique to suppress the polarization sensitivity in BOTDA fiber distributed sensing system by a simple polarization diversity scheme for the pump pulse. Stable temperature measurement is demonstrated along a 1.2 km SMF.
Fast four-step digital demodulation for multiplexed fibre laser sensors, Mark A. Milnes, Alexei E. Tikhomirov, Scott B. Foster, Steven J. Goodman, Defence Science and Technology Organisation (Australia) [7004-107]
We demonstrate an electro-optic phase modulator based demodulation system for acoustic frequency modulated optical signals. Digital interrogation method is based on the Carré algorithm for simultaneous phase retrieval at multiple wavelengths without the need for correction filters.
FBG sensor interrogation based on RF signal measurement, Xinyong Dong, Li-Yang Shao, Hong-Yan Fu, Hwa-Yaw Tam, Chao Lu, The Hong Kong Polytechnic Univ. (Hong Kong China) [7004-109]
A novel FBG sensor interrogation method has been proposed by converting the change of FBG wavelength into phase difference between two RF signals. Consequently, the beating-induced RF signal power changes with the FBG wavelength shift.
Monitoring surface crystal growth using an intrinsic exposed-core optical fiber sensor (IECOFS), David W. Lamb, Martijn Boerkamp, Peter G. Lye, Univ. of New England (Australia) [7004-112]
An unclad section of silica optical fiber has been used to detect, and measure heterogeneous (surface) crystal growth in a solution of calcium carbonate. The sensor can be re-used after simple chemical cleaning.
Fail-safe sensor for structural health monitoring, Annelene F. Dethlefsen, Swinburne Univ. of Technology (Australia); Henry C. H.Li, Royal Melbourne Institute of Technology (Australia); Claire E. Davis, Defence Science and Technology Organisation (Australia); Paul R. Stoddart, Swinburne Univ. of Technology (Australia) [7004-113]
A fail-safe design of an optical fibre strain sensor for structural health monitoring is introduced. This compact, low-cost system is applied to a bonded composite scarf joint with the guidance of a finite element model.
Pressure-compensated distributed-feedback fibre laser hydrophone, Steven J. Goodman, Alexei E. Tikhomirov, Scott B. Foster, Defence Science and Technology Organisation (Australia) [7004-114]
A pressure compensated DFB fibre laser hydrophone is described. Pressure compensation is achieved by incorporating an air-filled bladder and acoustic filter into the hydrophone making it insensitive to hydrostatic pressures to a depth of 50m.
Slotted microstructured optical fibers, Felicity M. Cox, Maryanne C. J.Large, The Univ. of Sydney (Australia); Cristiano M. B.Cordeiro, Univ. Estadual de Campinas (Brazil); Richard Lwin, Alexander Argyros, The Univ. of Sydney (Australia) [7004-120]
A new type of microstructured optical fiber, with a transverse slot running along its length, has been fabricated from polymethylmethacrylate. The slot exposes the fiber core over long lengths, allowing for materials to be directly introduced into the vicinity of the evanescent waves of the core modes. The use of this fiber as an evanescent wave chemical sensor has been demonstrated.
Backscatter immune Mach-Zehnder-Sagnac hybrid interferometric sensor, Jong H. Chow, Ian C. M.Littler, David E. McClelland, Malcolm B. Gray, The Australian National Univ. (Australia) [7004-121]
We propose and demonstrate a Mach-Zehnder-Sagnac hybrid interferometer for precision sensing. This configuration facilitates immunity from Rayleigh backscatter, polarization wander and scale factor drift in high performance fiber gyroscopes.
Quasi-static fiber strain sensing with absolute frequency referencing, Jong H. Chow, Ian C. M.Littler, David E. McClelland, Malcolm B. Gray, The Australian National Univ. (Australia) [7004-125]
We present a highly sensitive detection system for quasi-static strain, employing radio-frequency modulation interferometry and absolute frequency referencing, demonstrating a few tens of picostrain per root Hz sensitivity between 1 - 6 Hz.
Biaxial measurement of optical frequency domain reflectometry using polarization maintaining fiber Bragg grating, Koji Omichi, Akira Sakamoto, Shunichiro Hirafune, Tetsuya Sakai, Fujikura Ltd. (Japan); Hideaki Murayama, The Univ. of Tokyo (Japan); Hirotaka Igawa, Japan Aerospace Exploration Agency (Japan) [7004-126]
We demonstrated the optical frequency domain reflectometry (OFDR) measurement system with all polarization maintaining fiber including fiber Bragg grating (FBG). We succeeded to obtain the slow and fast axial Bragg reflection spectra individually. We proposed the novel method to compensate the measured position miss matching between slow and fast axial Bragg reflection spectra, and confirmed the validity of the method.
U-shaped plastic optical fiber dissolved oxygen sensor, Haiwen Cai, Fenghong Chu, Rong-Hui Qu, Zu-Jie Fang, Shanghai Institute of Optics and Fine Mechanics (China) [7004-127]
A dissolved oxygen sensor based on U-shape plastic optical fiber (POF) was described. Analyte-sensitive fluorophore are entrapped into ormosil film by using Sol-gel method. Phase modulation technique is used to measure fluorescence lifetime.
Fabrication and characterization of long period gratings in air-core photonic bandgap fibers, Wei Jin, Yiping Wang, Jian Ju, Haifeng Xuan, Hoi Lut Ho, Li Min Xiao, Dong Ning Wang, The Hong Kong Polytechnic Univ. (Hong Kong China) [7004-128]
Long period gratings in hollow-core photonic-bandgap fibers were fabricated by use of a pulsed CO2 laser. The resonant wavelengths of these gratings are sensitive to strain but insensitive to temperature, bend and external refractive index.
Design and clinical results from a fibre optic manometry catheter for oesophageal motility studies, John W. Arkwright, Simon N. Doe, Michael C. Smith, Neil G. Blenman, Ian D. Underhill, Simon A. Maunder, Julie A. Glasscock, Boon Lim, Commonwealth Scientific and Industrial Research Organisation (Australia); Michal M. Szczesniak, Phil G. Dinning, Ian J. Cook, Univ. of New South Wales (Australia) [7004-131]
The design of a fibre optic manometry catheter is reported and results from a clinical trial on ten healthy volunteers presented. Results show excellent agreement between the optical catheter and an equivalent solid-state device.
Characteristics of gas breakdown in hollow-core fibers, Xin Shi, The Hong Kong Polytechnic Univ. (Hong Kong China); Xin Bing Wang, Huazhong Univ. of Science and Technology (China); Wei Jin, M. Süleyman Demokan, The Hong Kong Polytechnic Univ. (Hong Kong China) [7004-132]
We succeeded in obtaining gas discharge in 250, 150, and 50µm bore-diameter hollow-core fibers by using longitudinal DC excitation. Stable glow discharges of at least several minutes were observed for these hollow-core fibers
Multiplexed fiber optic sensor array for geophysical survey, Ian C.Littler, Jong H. Chow, Daniel A. Shaddock, David E. McClelland, Malcolm B. Gray, The Australian National Univ. (Australia) [7004-133]
We present the latest results from our multiplexed fiber Fabry-Perot optic acoustic sensor array using modulated lasers. It offers the possibility of a robust, reliable and easy to deploy system, meeting the demands of geophysical survey.
Time-resolved all-fiber fluorescence spectroscopy system, Andy Y. H.Chen, Frederique Vanholsbeeck, Dean Tai, Simon Swift, Naresh Singhal, John D. Harvey, Darren A. Hooks, Bruce H. Smaill, The Univ. of Auckland (New Zealand) [7004-134]
We describe a simple low-cost all-fiber fluorescence spectrometry system with a wide variety of biomedical applications. This portable and robust system has the capacity to acquire fluorescence spectra at rates up to 1 kHz.
Nanoimprinting on optical fiber end faces for chemical sensing, Gorgi Kostovski, Royal Melbourne Institute of Technology (Australia); Daniel J. White, Swinburne Univ. of Technology (Australia); Arnan Mitchell, Michael W. Austin, Royal Melbourne Institute of Technology (Australia); Paul R. Stoddart, Swinburne Univ. of Technology (Australia) [7004-135]
Nanoimprint lithography has been used to fabricate nanoparticle arrays on the end faces of standard silica optical fibers. After coating with silver, chemical sensitivity was demonstrated by performing surface-enhanced Raman scattering measurements through the fiber.
10-kHz linewidth distributed-feedback photonic crystal fibre (DFB-PCF) laser, Jason D. De Iuliis, The Univ. of Newcastle (Australia); Nathaniel Groothoff, The Univ. of Sydney (Australia) and Interdisciplinary Photonics Labs (Australia); John L. Holdsworth, The Univ. of Newcastle (Australia); John Canning, The Univ. of Sydney (Australia); Cicero Martelli, The Univ. of Sydney (Australia) and Interdisciplinary Photonics Labs. (Australia); Andrew Michie, The Univ. of Sydney (Australia) and School of Physics (Australia); Stuart D. Jackson, The Univ. of Sydney (Australia) [7004-136]
A distributed feedback laser was fabricated in Er3+-doped photonic crystal fibre. Single mode lasing is obtained with <10 kHz linewidth. The output was amplified to 12mW using a commercial erbium doped fibre amplifier (EDFA).
Vibration sensing of solid using long-period fiber grating, Hiroyuki Somatomo, Satoshi Tanaka, Nobuaki Takahashi, National Defense Academy (Japan) [7004-140]
A LPG vibration sensor is constructed with the intensity-modulation scheme. The sensor gives a clear and stable waveform, and shows good linearity with the dynamic range more than 100 dB.
Azimuthally symmetric long period fibre grating fabrication with a TEM01*-mode CO2 laser, Ronnie Kritzinger, Diethelm Schmieder, Andre Booysen, Univ. of Johannesburg (South Africa) [7004-141]
We present a method that produces azimuthally symmetric long period fibre gratings using a TEM01* – mode CO2 laser. The outlay of the optical system is introduced, and the fibre grating fabrication method is outlined.
A digital passive phase demodulation scheme using 3×3 coupler for fiber optic interferometric sensors, Pang Meng, The Hong Kong Polytechnic Univ. (Hong Kong China); Min Zhang, Liwei Wang, Tsinghua Univ. (China); Wei Jin, The Hong Kong Polytechnic Univ. (Hong Kong China); Yanbiao Liao, Tsinghua Univ. (China) [7004-142]
A real-time digital phase demodulation scheme is developed. This scheme, based on cos-1 and channel-choosing techniques, uses the two optical outputs from a 3×3 coupler to overcome the signal fading problem of fiber interferometer.
Cladding mode resonance of special optical fiber for bending sensor with temperature insensitivity, Tingyun Wang, Fu-Fei Pang, Xianglong Zeng, Wenbin Liang, Wenchao Xiang, Zhenyi Chen, Shanghai Univ. ( China) [7004-143]
We demonstrated a temperature-insensitive fiber bending sensor based on a special optical fiber with cladding mode resonance. It was investigated with high sensitivity to be -10.15nm•m-1 and was found to possess an insensitivity to temperature.
Blind source separation techniques for percolation-type leakage detection in dikes using fiber optic DTS signals, Amir Ali Khan, Institut National Polytechnique de Grenoble (France); Valeriu Vrabie, Univ. de Reims Champagne-Ardenne (France); Guy D'Urso, Electricite de France (France); Jerome I. Mars, Univ. Joseph Fourier (France) [7004-146]
Efficiency of source separation techniques for leakage detection using DTS signals is studied. After extracting ground response by singular value decomposition, independent component analysis algorithms, JADE and FastICA, are applied in symmetric and deflation modes.
Wavelength-tuneable add/drop multiplexer using broadband transmission filters and a narrowband reflection filter, Ronnie Kritzinger, Andre Booysen, Univ. of Johannesburg (South Africa) [7004-147]
We present an optical add/drop multiplexing device utilising a pair of broadband transmission filters and a narrowband tuneable reflection filter, designed for operation in a dense wavelength-division multiplexing network.
Vulnerability of fiber optic links for high-speed diagnostics to pulsed-power facilities, Sylvain Girard, Jacques Baggio, Jean-Luc Bourgade, Sébastien Bazzoli, Commissariat a l'Energie Atomique (France); Vladimir Y. Glebov, Gregory Pien, Thomas C. Sangster, Univ. of Rochester [7004-148]
The vulnerability of fiber-optic links for high-speed diagnostics to the harsh environments (14 MeV neutrons, x- and gamma-rays) associated with the future Megajoule class lasers (LMJ, NIF) is investigated.
Highly efficient fluorescence sensing using microstructured optical fibres: general model and experiment, Shahraam Afshar, Yinlan Ruan, Stephen C. Warren-Smith, Heike Ebendorff-Heidepriem, Tanya M. Monro, The Univ. of Adelaide (Australia) [7004-149]
A general model of excitation and fluorescence recapturing by the forward and backward modes of filled microstructured optical fibres is developed for fluorecence-based fibre optic sensors and tested experimentally.
Microstructured index-guiding fibers with large cladding holes, Hartmut Lehmann, IPHT Jena (Germany) [7004-150]
Design, fabrication and application of small solid-core microstructured optical fibers with large cladding holes for evanescent field chemical sensing of gases and liquids will be presented. Such steering-wheel fiber structures give a high mode-field overlap in the holey region, they show low losses over a broad spectral range and they are easier to fabricate than hollow-core bandgap-guiding photonic crystal fibers.
Fiber Bragg grating based accelerometer, Ho Yin Au, The Hong Kong Polytechnic Univ. (China); S. K. Khijwania, Indian Institute of Technology (India); Hwa-Yaw Tam, The Hong Kong Polytechnic Univ. (China) [7004-153]
A novel fiber Bragg grating based accelerometer is proposed. With a chirp-free mechanism, a cantilever beam accelerometer has the capability to measure large amplitude vibration by FBG without deteriorated the signal.
Research on high-resolution distributed fiber optic stress sensor for landslide monitoring, Zhiyong Dai, Univ. of Electronic Science and Technology of China (China) [7004-154]
An early warning monitoring system for landslides, based on high spatial resolution distributed fiber optic stress sensing and monitoring the intra-stress distribution and changes in landslide bodies, was first presented. The sensor with stress measuring range 0-15Mpa, 10cm spatial resolutions and measuring range 0.5km, was designed. The field test to the monitoring system was implemented.
10-keV x-ray radiation effects on Yb- and Er/Yb-doped optical fibers: a microluminescence study, Sylvain Girard, Commissariat a l'Energie Atomique (France); Youcef Ouerdane, Univ. Jean Monnet Saint-Etienne (France); Claude Marcandella, Commissariat a l'Energie Atomique (France); Thierry Robin, iXFiber SAS (France); Aziz Boukenter, Univ. Jean Monnet Saint-Etienne (France); Benoît Cadier, iXFiber SAS (France); Jean-Pierre Meunier, Blandine Tortech, Univ. Jean Monnet Saint-Etienne (France); Patrice Crochet, iXFiber SAS (France) [7004-157]
We investigate by confocal luminescence microscopy the radiation-induced spectroscopic changes on prototype Yb or Yb/Er -doped optical fibers to study the relative influence of the P, Al doping on their radiation responses
Novel fiber optic polarimetric torsion sensor based on polarization-maintaining photonic crystal fiber, Hong-Yan Fu, The Hong Kong Polytechnic Univ. (Hong Kong China); S.K. Khijwania, Indian Institute of Technology (India); Ho Yin Au, Xinyong Dong, Hwa-Yaw Tam, Ping-Kong A. Wai, Chao Lu, The Hong Kong Polytechnic Univ. (Hong Kong China) [7004-158]
We proposed and demonstrated the application of a polarization-maintaining photonic crystal fiber for torsion sensing. The sensor has high twist angle resolution and exhibits reduced temperature sensitivity, making it an ideal candidate for torsion sensing.
Self-aligning fibre for a fibre optic voltage sensor, Philip O. Hambley, Optical Fibre Technology Ctr. (Australia) and The Univ. of Sydney (Australia); Andrew Michie, Ian M. Bassett, Peter Henry, The Univ. of Sydney (Australia); John Ingram, ABB Australia (Australia) [7004-159]
The ongoing development of a fibre optic voltage sensor requires a self-aligning fibre. We experimentally demonstrate fibre designs with preferential bending directions which self-align when coiled as part of a voltage sensor device. Such a fibre has much wider applications.
Hybrid optical fiber sensor and artificial neural networks system for bioethanol quality control and productivity enhancement, Edmilton Gusken, Ricardo M. Salgado, Univ. Estadual de Campinas (Brazil); Carlos E. V.Rossell, Ministry of Science and Technology (Brazil); Takaaki Ohishi, Carlos K. Suzuki, Univ. Estadual de Campinas (Brazil) [7004-161]
The bioethanol concentration analysis in distilled solution by intelligent-system can effectively detect and update the correction of distillation-parameters to reduce losses of bioethanol and also to improve the quality in a production plant.
Optical fiber sensor toward pyridine vapors detection, Cesar Elosua, Candido Bariain, Ignacio R. Matias, Univ. Pública de Navarra (Spain); Antonio G. Rodriguez, Enrique Colacio, Alfonso Salinas, Antonio Segura, Alberto Fernandez, Univ. de Granada (Spain) [7004-162]
A novel vapochromic complex has been used to develop an optical fiber device sensitive to pyridine vapors. Devices showing a linear response with different vapors concentrations were obtained, with a detection limit of 1 PPM.
Progress toward low-cost mass-produced polymer fibre tapers for liquid level monitors, Philip O. Hambley, Optical Fibre Technology Ctr. (Australia); John Canning, Univ. of Sydney (Australia) [7004-163]
Tapers suitable for a range of sensing applications have been produced using a heat and pull method. The standard heat and pull method is much faster than chemical tapering and also allows multiple tapers to be formed on to a single fibre for distributed sensing.