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Author: search.filters.author.Chi, SSubject: search.filters.subject.fiber sensor

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Now showing 1 - 10 of 11
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    Item type:Item,
    High-resolution fiber Bragg grating sensor system using linear-cavity fiber laser scheme
    (2002-09-05)
    Peng, PC
    ;
    Tseng, HY
    ;
    Chi, S
    ;
    光電工程學系
    ;
    Department of Photonics
    A high-resolution fiber Bragg grating (FBG) sensor system using a linear-cavity fiber laser scheme is proposed and numerically studied. The proposed sensor system can improve the sensing accuracy by using a discriminating FBG pair in conjunction with a fiber laser scheme. This FBG sensor system can resolve the temperature up to 0.0005degreesC theoretically and can be applied for strain sensing and temperature sensing with high precision. (C) 2002 Wiley Periodicals, Inc.
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    Item type:Item,
    Fiber-ring laser-based fiber grating sensor system using self-healing ring architecture
    (2002-12-20)
    Peng, PC
    ;
    Tseng, HY
    ;
    Chi, S
    ;
    光電工程學系
    ;
    Department of Photonics
    This paper presents a self-healing fiber grating sensor system and demonstrates its effectiveness. The self-healing function is constructed by using a primary ring architecture incorporated with several ring sub-networks. To enhance the sensing signal when a breakpoint suddenly occurs in the network, we employ a fiber-ring laser-based sensor system. The network survivability of an 11-point FBG sensor is experimentally examined. The proposed fiber grating sensor system can increase the reliability of a sensing network. (C) 2002 Wiley Periodicals, Inc.
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    Item type:Item,
    A novel fiber-laser-based sensor network with self-healing function
    (2003-02-01)
    Peng, PC
    ;
    Tseng, HY
    ;
    Chi, S
    ;
    光電工程學系
    ;
    Department of Photonics
    In this letter, we, present a novel fiber-laser-based sensor network. with self-healing. function and demonstrate its effectiveness. The network survivability and capacity for a multipoint sensor system ate enhanced by adding switches in a self-healing ring architecture. The fiber laser adopted in this system is a linear-cavity filter Bragg grating (FBG) laser leading to the signal-to-noise ratio. over 52 dB for the sensor network. The network survivability of a ten-point FBG sensor is experimentally examined. The experimental results show that the proposed system can facilitate reliable, sensing network for a large-scale and multipoint smart structure.
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    Item type:Item,
    A simple fiber-Bragg-grating sensor system based on a linear-cavity fiber laser
    (2003-04-05)
    Peng, PC
    ;
    Tseng, HY
    ;
    Chi, S
    ;
    光電工程學系
    ;
    Department of Photonics
    A simple fiber-Bragg-grating (FBG) sensor system based on a linear-cavity fiber laser is proposed and experimentally demonstrated. The lasing wavelength shift resulting from the temperature variation on this sensing element is discriminated by two FBGs. These two FBGs, acting as wavelength discriminators, are used to increase the real-time measurement range for monitoring the temperature variation. (C) 2003 Wiley Periodicals, Inc.
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    Item type:Item,
    A hybrid star-ring architecture for fiber Bragg grating sensor system
    (2003-09-01)
    Peng, PC
    ;
    Tseng, HY
    ;
    Chi, S
    ;
    光電工程學系
    ;
    Department of Photonics
    In this letter, we present a hybrid star-ring architecture for a highly reliable fiber Bragg grating (FBG) sensor system and demonstrate its effectiveness. The main trunk of the proposed sensor network is star topology and the sensing branches comprise a series of concatenated ring subnets. The weakness in reliability of the star network is overcome by the ring subnets with a self-healing function based on the reconfigurable optical switches between each subnet. To enhance the signal-to-noise ratio (SNR) of the sensor system, we adopt a linear-cavity FBG laser scheme to construct our proposed hybrid star-ring architecture. Such a fiber-laser scheme results in the SNR over 48 dB for the sensor network. The network survivability of a ten-point FBG sensor is experimentally examined. It is shown that the proposed FBG sensor system can increase the reliability of a sensing network.
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    Item type:Item,
    Intensity and wavelength-division multiplexing FBG sensor system using a tunable multiport fiber ring laser
    (2004-01-01)
    Peng, PC
    ;
    Lin, JH
    ;
    Tseng, HY
    ;
    Chi, S
    ;
    光電工程學系
    We propose an intensity and wavelength-division multiplexing (IWDM) fiber Bragg grating (FBG) sensor system using a tunable multiport fiber ring laser. The different output powers of a multiport fiber laser are used to address the information reflected from the sensing FBGs, even if the Bragg wavelengths of the FBGs connected at different laser output ports are identical. We describe the operation principle and experimentally demonstrate a three-port fiber sensor. For the IWDM technique, our proposed fiber grating sensor system can enhance the sensing capacity, signal-to-noise ratio, and sensing resolution.
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    Item type:Item,
    Long-distance FBG sensor system using a linear-cavity fiber Raman laser scheme
    (2004-02-01)
    Peng, PC
    ;
    Tseng, HY
    ;
    Chi, S
    ;
    光電工程學系
    ;
    Department of Photonics
    We propose a novel fiber Bragg grating (FBG) sensor system using a linear-cavity fiber laser scheme with a distributed Raman amplifier as a gain medium. The inhomogeneous broadening property of the distributed Raman amplifier is used for multiwavelength operation. The experiment shows that such a linear-cavity fiber Raman laser can provide a stable output with an optical signal-to-noise ratio over 50 dB even if the FBG is located at a 25-km remote sensing position. The feature of our proposed fiber laser can facilitate a long-distance or a large-scale fiber sensor system and can be easily extended for multipoint sensing applications.
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    Item type:Item,
    Star-bus-ring architecture for fiber Bragg grating sensors
    (2004-10-01)
    Peng, PC
    ;
    Lin, WP
    ;
    Chi, S
    ;
    光電工程學系
    ;
    Department of Photonics
    A star-bus-ring architecture for fiber Bragg grating (FBG) sensors is proposed and demonstrated. The FBG survivability and capacity of a multipoint sensor system are enhanced by adding remote nodes and 2 x 2 optical switches to the star-bus-ring architecture. Moreover, to enhance the signal-to-noise ratio (SNR) of the sensor system, we adopt a FBG laser scheme in constructing our proposed star-bus-ring architecture. The fiber laser adopted in this system resulted in an SNR of more than 50 dB for the sensor system. Finally, the network survivability is experimentally verified.
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    Item type:Item,
    Long-distance FBG sensor system using fiber ring laser with hybrid amplifier
    (2005)
    Peng, PC
    ;
    Feng, KM
    ;
    Peng, WR
    ;
    Chiou, HY
    ;
    Chang, CC
    A fiber Bragg grating (FBG) sensor system using a fiber ring laser with a hybrid amplifier is proposed and demonstrated. The hybrid amplifier comprises an erbium doped waveguide amplifier and a semiconductor optical amplifier. The experiment shows that such the hybrid amplifier has a high amplifier spontaneous emission power and gain spectrum. Moreover, this fiber ring laser can provide a stable multiwavelength output with an optical signal-to-noise ratio over 50 dB even if the FBGs are located at a 25 kin remote sensing position.
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    Item type:Item,
    Long-distance fiber grating sensor system using a fiber ring laser with EDWA and SOA
    (2005-08-01)
    Peng, PC
    ;
    Feng, KM
    ;
    Peng, WR
    ;
    Chiou, HY
    ;
    Chang, CC
    This investigation presents and demonstrates the feasibility of a novel fiber Bragg grating (FBG) sensor system using a fiber ring laser with a hybrid amplifier. The hybrid amplifier comprises an erbium-doped waveguide amplifier (EDWA) and a semiconductor optical amplifier (SOA). Experimental results demonstrate that the hybrid amplifier has a higher amplifier spontaneous emission power and gain spectrum. Moreover, this novel fiber ring laser provides a stable multiwavelength output with an optical signal-to-noise ratio over 50 dB, even when FBGs are located at a 25 km remote sensing position. The primary feature of the proposed fiber laser is that it facilitates a long-distance or a large-scale sensor system. (C) 2005 Elsevier B.V. All rights reserved.