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检索条件"任意字段=Advanced Sensor Systems and Applications II"

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A novel spatial-frequency-multiplexed fiber-optic Fizeau strain sensor system

A novel spatial-frequency-multiplexed fiber-optic Fizeau str...

引用

Conference on advanced sensor systems and applications ii

作者： Rao, YJ Jiang, J Zhou, CX Chongqing Univ Opt Fiber Technol Grp Dept Optoelect Engn Chongqing 400044 Peoples R China

ISBN: (纸本)081945589X

A novel method for multiplexing fiber-optic Fizeau strain sensors with optical amplification is proposed and demonstrated. This method overcomes the two intrinsic disadvantages of fiber-optic Fabry-Perot (F-P) strain sensors, i.e. weak signal and difficult multiplexing. The amplified spontaneous emission (ASE) and optical amplification of an Erbium-doped fiber (EDF) pumped by a 980nm laser diode are used simultaneously to enhance the interferometric signal considerably. A Fizeau interferometer formed by two fiber ends with a quite different reflectivity is used to replace the F-P cavity in sensor head design. Such a Fizeau cavity can enlarge the cavity length by at least an order of magnitude and allows more than ten sensors to be multiplexed simultaneously by using spatial-frequency multiplexing. The operating principle of the sensor system is discussed and an experiment is carried out to verify the concept of the method proposed. It is anticipated that such a sensor system could find important applications for health monitoring of large structures.

关键词： optical fiber sensors Fabry-Perot interferometer Fizeau cavity multiplexing strain gauge optical fiber amplifier

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Quasi-static analysis of parachute textile with fiber optic sensors

Quasi-static analysis of parachute textile with fiber optic ...

引用

Conference on advanced sensor systems and applications ii

作者： Li, M Li, YL China Jiliang Univ Dept Informat Engn Hangzhou 310018 Peoples R China

ISBN: (纸本)081945589X

Quasi-static testing of the fabric material mechanically with a novel embedded strain measurement system, which aimed at mechanical analysis of the dynamic characteristics of the parachute canopy textile with fiber optic technology, and using a tensile tester were aimed at correlating the results obtained by using the fiber optic sensors to the mechanical parameters, and in calibrating the system. To achieve better and more consistent results, FBG sensor took part in fabric samples testing in the warp, fill, and 45 degrees directions. The mechanical tensile tests provided a traditional correlation between the loads and the elongation of the fabric structure, and were correlated to the fiber optic sensor output calibration. The comparison shows clearly that the two curves converged in the loading region before the structural failure started. The achieved results were consistent with each other, which dues primarily to the consistency in the fiber embedded technique, and will be discussed in detail in this paper.

关键词： embedded sensor fiber optics smart textile

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Design of a vision sensor for monitoring micro-plasma arc welding of metal bellows

Design of a vision sensor for monitoring micro-plasma arc we...

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Conference on advanced sensor systems and applications ii

作者： Zhang, WZ Tsing Hua Univ Dept Engn Mech Beijing Peoples R China

ISBN: (纸本)081945589X

Metal bellows is one of important components for mechanical sealing. Because the seam is very thin, and its spatial position is strictly limited, it is very difficult to observe the welding seam in order to control the variables of welding in real-time, the welding quality can not usually be guaranteed under the traditional technology. A novel approach is proposed, which is able to provide an amplificatory and clear image of the micro-plasma welding seam observed from better perspective, then output the image to computer and process it so that the variables of welding can be controlled in real-time. A special optical sensor has been designed and realized according to the approach. The principle and main technologies of the sensor is described in detail. The results of applying the system in practice approved the approach is successful. The welding quality of the inner circle of metal bellows, as well as the working condition of welder has been improved after the system is applied.

关键词： vision sensor optical system micro-plasma arc welding monitoring filter metal bellows

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Optic-fiber sensor for steam quality measurement

Optic-fiber sensor for steam quality measurement

引用

Conference on advanced sensor systems and applications ii

作者： Liang, P Yu, JJ Zu, GR Li, XJ Shen, Y Qian, L Zou, LX Soochow Univ Inst Modern Opt Technol Suzhou 215006 Peoples R China

ISBN: (纸本)081945589X

The optic-fiber sensor for measuring steam quality has been made out based on the principle of refractivity modulation. It is made up of optic head, conduct optic fiber, light source, detector and electric circuits. Reflectivity on the boundary between optic head and two-phase steam flow can be determined by refractivity of both sides of the boundary. Intensity of reflected light on the boundary is related to the ratio of water and steam. Provided we know the value of temperature or pressure of the two-phase flow, densities of water and vapor can be known and steam quality can be converted from the volume ratio of water and steam. The measuring range of steam quality is 0-100%, and the accuracy is decided by the level of steam quality measured and by resolution power of the sensor. The resolution and sensitivity of the sensor can be tested with two sorts of liquid of known refractive index. Meanwhile, the stability of output of the sensor is also approved. The sensor has been successfully used in measurement of steam quality in a steam-injection oil well with temperature of 270 degrees C and pressure of 8MPa. The measuring result of steam quality tallies with the actual situation.

关键词： fiber-optic sensor refractivity modulation steam quality measurement steam-injection oil well

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Adaptive compensation of atmospheric turbulence utilizing an interferometric wave-front sensor and a high-resolution MEMS-based spatial light modulator

Adaptive compensation of atmospheric turbulence utilizing an...

引用

Conference on advanced Wavefront Control - Methods, Devices and applications ii

作者： Baker, KL Stappaerts, EA Gavel, D Tucker, J Silva, DA Wilks, SC Olivier, SS Olsen, J Lawrence Livermore Natl Lab Livermore CA 94550 USA

ISBN: (纸本)0819454915

Horizontal path correction of optical beam propagation presents a severe challenge to adaptive optics systems due to the short transverse coherence length and the high degree of scintillation incurred by propagation along these paths. The system presented operates with nearly monochromatic light. It does not require a global reconstruction of the phase, thereby eliminating issues with branch points and making its performance relatively unaffected by scintillation. The systems pixel count, 1024, and relatively high correction speed, in excess of 800 Hz, enable its use for correction of horizontal path beam propagation. We present results from laboratory and field tests of the system in which we have achieved Strehl ratios greater than 0.5.

关键词： adaptive optics

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A novel stress and strain sensor based on triple-core photonic crystal fiber

A novel stress and strain sensor based on triple-core photon...

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Conference on advanced sensor systems and applications ii

作者： Yu, X Shum, P Nanyang Technol Univ Network Technol Res Ctr Singapore 637553 Singapore

ISBN: (纸本)081945589X

Photonic Crystal Fibers (PCFs) have recently attracted many attentions from research groups worldwide and many novel applications have been developed. We find that this kind of special fiber also enables various new possibilities for the construction of novel optical sensors that are highly compact and functional. In this paper, a novel stress and strain sensor based on triple-core PCF is proposed. The triple identical solid cores are triangularly arranged to detect the stress from different transverse directions as well as the strain in the longitudinal direction. Fiber cross-section structure variation due to stress is simulated in a PCF structure. Different mode distributions caused from stress in the triple-core structure is systematically investigated for the first time to the best of our knowledge. Meanwhile, output mode distribution sensitively changes with fiber length variation caused by strain. Relationship between sensitivity and fiber geometrical structure (fiber length, hole diameter, hole to hole center pitch distance) are explored and analyzed. We conclude that the PCF-based stress sensor exhibits many functionality and advantages such as totally single-mode operation, short length, strong sensitivity of strain, and good sensitivity of stress from all directions in the fiber cross-section. Furthermore, three identical endlessly single mode PCFs will be fused together and tapered to construct a triple-core structure. Various parameters are measured and tested upon this tapered trip-core PCF and the results will be published soon.

关键词： Photonic Crystal Fiber mode dispersion confinement loss bending loss stress strain sensitivity

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Novel low-cost vision sensing technology with controllable of exposal time for welding

Novel low-cost vision sensing technology with controllable o...

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Conference on advanced sensor systems and applications ii

作者： Zhang, WZ Wang, B Chen, N Cao, YP Tsing Hua Univ Dept Engn Mech Beijing Peoples R China

ISBN: (纸本)081945589X

In the process of robot Welding, position of welding seam and welding pool shape is detected by CCD camera for quality control and seam tracking in real-time. It is difficult to always get a clear welding image in some welding methods, such as TIG welding. A novel idea that the exposal time of CCD camera is automatically controlled by arc voltage or arc luminance is proposed to get clear welding image. A set of special device and circuits are added to a common industrial CCD camera in order to flexibly control the CCD to start or close exposal by control of the internal clearing signal of the accumulated charge. Two special vision sensors according to the idea are developed. Their exposal grabbing can be triggered respectively by the arc voltage and the variety of the arc luminance. Two prototypes have been designed and manufactured. Experiments show that they can stably grab clear welding images at appointed moment, which is a basic for the feedback control of automatic welding.

关键词： vision sensor CCD camera exposal time welding arc voltage arc luminance accumulated charge signal

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Electrostatic membrane deformable mirror wavefront control systems: Design and analysis

Electrostatic membrane deformable mirror wavefront control s...

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Conference on advanced Wavefront Control - Methods, Devices and applications ii

作者： Bush, K German, D Klemme, B Marrs, A Schoen, M Intellite Inc Albuquerque NM 87110 USA

ISBN: (纸本)0819454915

Electrostatic Membrane Deformable Mirrors (DM) developed using silicon bulk micro-machining techniques offer the potential of providing low-cost, compact wavefront control systems for diverse optical system applications. The basic approach to electrostatic mirror construction, using bulk micro-machining, is relatively simple, allowing for custom designs to satisfy wavefront control requirements for most optical systems. An electrostatic DM consists of a thin membrane suspended over an actuator pad array that is connected to a high-voltage driver. Voltages applied to the array elements deflect the membrane to provide an optical surface capable of correcting for measured optical aberrations in a given system. The actuator voltages required to correct a given aberration are determined from wavefront sensor measurements and the mirror influence functions and/or through the minimization of measured error in the closed-loop control system. Electrostatic membrane DM designs are derived from well-known principles of membrane mechanics and electrostatics, the desired optical wavefront control requirements, and the current limitations of mirror fabrication and actuator drive electronics. In this paper, we discuss the electrostatic DM design process in some detail and present modeling results illustrating the performance of specific designs in terms of their ability to correct Zernike optical aberrations.

关键词： deformable mirror electrostatic membrane wavefront control MEMS

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Fiber Bragg grating sensors for structural and railway applications

Fiber Bragg grating sensors for structural and railway appli...

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Conference on advanced sensor systems and applications ii

作者： Tam, HY Liu, SY Guan, BO Chung, WH Chan, THT Cheng, LK Polytech Univ Dept Elect Engn Photon Res Ctr Hong Kong Hong Kong Peoples R China

ISBN: (纸本)081945589X

Historically, due to the high cost of optical devices, fiber-optics sensor systems were only employed in niche areas where conventional electrical sensors are not suitable. This scenario changed dramatically in the last few years following the explosion of the Internet which caused the rapid expansion of the optical fiber telecommunication industry and substantially driven down the cost of optical components. In recent years, fiber-optic sensors and particularly fiber Bragg grating (FBG) sensors have attracted a lot of interests and are being used in numerous applications. We have conducted several field trials of FBG sensors for railway applications and structural monitoring. About 30 FBG sensors were installed on the rail tracks of Kowloon-Canton Railway Corp. for train identification and speed measurements and the results obtained show that FBG sensors exhibit very good performance and could play a major role in the realization of "Smart Railway". FBG sensors were also installed on Hong Kong's landmark TsingMa Bridge, which is the world longest suspension bridge (2.2 km) that carries both trains and regular road traffic. The trials were carried out with a high-speed (up to 20 kHz) interrogation system based on CCD and also with a interrogation unit that based on scanning optical filter (up to 70 Hz). Forty FBGs sensors were divided into 3 arrays and installed on different parts of the bridge (suspension cable, rocker bearing and truss girders). The objectives of the field trial on the TsingMa Bridge are to monitor the strain of different parts of the bridge under railway load and highway load, and to compare the FBG sensors' performance with conventional resistive strain gauges already installed on the bridge. The measured results show that excellent agreement was obtained between the 2 types of sensors.

关键词： Fiber Bragg gratings sensors Bridges Fiber optics sensors Wavelength division multiplexing Time division multiplexing Optical fibers Optical filters Telecommunications Temperature metrology

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Experimental study on a novel structure of fiber ring laser gyroscope

Experimental study on a novel structure of fiber ring laser ...

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Conference on advanced sensor systems and applications ii

作者： Lu, JJ Chen, SF Bai, Y Beijing Inst Technol Dept Opt Engn Beijing 100081 Peoples R China

ISBN: (纸本)081945589X

Fiber Ring Laser Gyroscope (FRLG) is a novel resonant gyroscope which uses erbium-doped optical fiber as the gain medium and optical fiber as the ring resonant cavity. FRLG have advantages over conventional Interferential Fiber Optical Gyroscope (IFOG) with its simplicity in both the optical configuration and the electronic signal processing. The precision of FRLG depend on the linewidth of fiber ring laser output. So how to get narrower laser linewidth is key technology for FRLG. According to recently report, FRLG's laser linewidth reach 100 kHz, can not directly applicable to rotation sensing at present. A Stand-wave in the un-pumped erbium-doped fiber can induce self-written fiber grating, which have self-adaptable narrow band pass characteristics. Base on this, we propose a novel FRLG's structure. Two filter sections were used in this structure to make sure FRLG run in narrow linewidth and single mode. Fiber circulator, un-pumped erbium-doped optical fiber and Bragg grating (FBG) as the reflect mirror make up of the filter section. In this paper, we have optimized the parameters through a computing simulation. The theoretical and experimental study on FRLG has been finished. We get experimental results from them. FRLG which use this structure can get bidirectional laser output, the linewidth of laser can reach about tens kHz level and the power of laser output can reach 1dbm.

关键词： fiber ring laser gyroscope fiber laser single longitudinal mode fiber sensor

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