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🏛️國立陽明交通大學機構典藏

Author: search.filters.author.Yeh, Chien-HungSubject: search.filters.subject.fiber sensor

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Now showing 1 - 5 of 5
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    Long-distance strain-induced-grating-based fiber sensors with erbium-based amplifiers
    (2007-06-01)
    Yeh, Chien-Hung
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    Lin, Ming-Ching
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    Cheng, Bing-Chung
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    Chi, Sien
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    光電工程學系
    We investigate and demonstrate experimentally a two-stage erbium-based amplifier with a larger amplified-spontaneous-emission light source for a long-distance fiber sensor by using strain-induced fiber Bragg gratings in the fiber systems. In a 20-km-long fiber sensor system, the sensor has a maximal approximate to 2.28-nm wavelength shift under a 1500-mu m/m strain. (c) 2007 Society of Photo-Optical Instrumentation Engineers.
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    In-fiber Long-period Grating and Fiber Bragg Grating-based Sensor for Simultaneously Monitoring Remote Temperature and Stress
    (2018-01-01)
    Chang, Hung-Ying
    ;
    Yeh, Chien-Hung
    ;
    Huang, Chuan-Ying
    ;
    Fu, Ming-Yue
    ;
    Chow, Chi-Wai
    In this study, we experimentally demonstrated that a high-sensitivity fiber sensor can be used for the remote sensing of temperature and stress simultaneously. The proposed sensor includes several sensing heads, each of which is composed of a long-period grating (LPG) and a fiber Bragg grating (FBG). Moreover, the optical characteristics of both the FBG and LPG are different. On the basis of these different optical features and the sensing transfer matrix, temperature and stress can both be remotely measured simultaneously. The temperature sensitivities of the grating-wavelength shift and grating-reflection intensity are about 0.0082 nm/degrees C and 0.044 dBm/degrees C, respectively. The strain sensitivities of the grating wavelength shift and grating-reflection intensity are respectively around 0.0133 nm/g and 0.0089 dBm/g. Therefore, the fiber sensor can provide a simple method with excellent sensitivity for applications of structure-security monitoring and industrial engineering measurements.
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    Capacity and capability enhancements of FBG sensor system by utilizing intensity and WDM detection technique
    (2017-03-01)
    Yeh, Chien-Hung
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    Zhuang, Yuan-Hong
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    Tsai, Ning
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    Chow, Chi-Wai
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    光電工程學系
    In this paper, we demonstrate a multipoint fiber Bragg grating (FBG)-based sensor system by using intensity and wavelength-division-multiplexing (I-WDM) technique to enhance the sensing capacity and capability. In the proposed multipoint sensor system, a three output port optical splitter with different output ratios of 50%, 35% and 15% is proposed to connect each intensity coding FBG sensor for strain and temperature sensing simultaneously. Different output ratios of connected ports can produce different intensity-coding for I-WDM application. Nine FBGs with different Bragg wavelengths are employed for demonstration. The proposed FBG sensor system not only can sense the strain and temperature simultaneously, but also can increase the capacity and capability.
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    Measurement of Organic Chemical Refractive Indexes Using an Optical Time-Domain Reflectometer
    (2012-01-01)
    Yeh, Chien-Hung
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    Chow, Chi-Wai
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    Sung, Jiun-Yu
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    Wu, Ping-Chun
    ;
    Whang, Wha-Tzong
    In this investigation, we propose and experimentally demonstrate a method for measuring the refractive index (RI) of liquid organic chemicals. The scheme is based on a single-mode fiber (SMF) sensor and an optical time-domain reflectometer (OTDR). Here, due to the different reflectance (R) between the SMF and organic liquid chemicals, the reflected power level of the backscattering light (BSL) measured by the OTDR would be different. Therefore, we can measure the RI of chemical under test via the measured BSL level. The proposed RI sensor is simple and easy to manipulate, with stable detected signals, and has the potential to be a valuable tool for use in biological and chemical applications.
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    A simple self-restored fiber Bragg grating (FBG)-based passive sensing ring network
    (2009-04-01)
    Yeh, Chien-Hung
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    Chow, Chi-Wai
    ;
    Wang, Chia-Husan
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    Shih, Fu-Yuan
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    Wu, Yu-Fu
    In this investigation, we propose and experimentally investigate a simple self-restored fiber Bragg grating (FBG)-based sensor ring system. This proposed multi-ring passive sensing architecture does not require active components in the network. In this experiment, the network survivability and capacity for the multi-point sensor systems are also enhanced. Besides, the tunable laser source (TLS) is adopted in a central office (CO) for FBG sensing. The survivability of an eight-point FBG sensor is examined and analyzed. It is cost effective since the sensing system is entirely centralized in the CO. Experimental results show that the proposed system can enhance the reliability of the FBG sensing network for large-scale and multi-point architecture.