• 제목/요약/키워드: fiber optic sensing

검색결과 151건 처리시간 0.026초

A Fiber Optic Sensor for Determination of 2,4-Dichlorophenol Based on Oxygen Oxidation Catalyzed by Iron(III) Tetrasulfophthalocyanine

  • Tong, Yilin;Li, Dapeng;Huang, Jun;Zhang, Cong;Li, Kun;Ding, Liyun
    • Bulletin of the Korean Chemical Society
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    • 제34권11호
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    • pp.3307-3311
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    • 2013
  • A new fiber optical sensor was developed for the determination of 2,4-dichlorophenol (DCP). The sensor was based on DCP oxidation by oxygen with the catalysis of iron(III) tetrasulfophthalocyanine (Fe(III)PcTs). The optical oxygen sensing film with $Ru(bpy)_3Cl_2$ as the fluorescence indicator was used to determine the consumption of oxygen in solution. A lock-in amplifier was used for detecting the lifetime of the oxygen sensing film by measuring the phase delay change of the sensor head. The different variables affecting the sensor performance were evaluated and optimized. Under the optimal conditions (i.e. pH 6.0, $25^{\circ}C$, Fe(III)PcTs concentration of 0.62 mg/mL), the linear detection range and response time of the sensor are $1.0{\times}10^{-6}-9.0{\times}10^{-6}$ mol/L and 250 s, respectively. The sensor displays high selectivity, good repeatability and stability, and can be used as an effective tool in analyzing DCP concentration in practical samples.

광섬유 센서를 이용한 지중 열교환기 시스템 온도 모니터링 (Fiber optic distribution temperature sensing in a borehole heat exchanger system)

  • 심병완;이영민;김형찬;송윤호
    • 한국신재생에너지학회:학술대회논문집
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    • 한국신재생에너지학회 2006년도 춘계학술대회
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    • pp.451-454
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    • 2006
  • Fiber optic distributed temperature sensing and thermal line sensor are applied in an observation borehole and a loom deep borehole heat exchanger. For the case of permanently installed system fiber optic DTS is very useful. By comparing with TLS, fiber optic DTS shows good accuracy and reliability. Ground water flow can give influences at heat exchange rate of the heat pump system. According to the hydraulic characteristics and temperature-depth profile, we consider that temperature-depth profile do not seem to be dependent on ground water flow. A permanent installation of fiber optic cable is expected as a reliable temperature measurement technique in a borehole heat exchanger system.

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Temperature Compensation of a Strain Sensing Signal from a Fiber Optic Brillouin Optical Time Domain Analysis Sensor

  • Kwon, Il-Bum;Kim, Chi-Yeop;Cho, Seok-Beom;Lee, Jung-Ju
    • Journal of the Optical Society of Korea
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    • 제7권2호
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    • pp.106-112
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    • 2003
  • In order to do continuous health monitoring of large structures, it is necessary that the distributed sensing of strain and temperature of the structures be measured. So, we present the temperature compensation of a signal from a fiber optic BOTDA (Brillouin Optical Time Domain Analysis) sensor. A fiber optic BOTDA sensor has good performance of strain measurement. However, the signal of a fiber optic BOTDA sensor is influenced by strain and temperature. Therefore, we applied an optical fiber on the beam as follows: one part of the fiber, which is sensitive to the strain and the temperature, is bonded on the surface of the beam and another part of the fiber, which is only sensitive to the temperature, is located nearby the strain sensing fiber. Therefore, the strains can be determined from the strain sensing fiber while compensating for the temperature from the temperature sensing fiber. These measured strains were compared with the strains from electrical strain gages. After temperature compensation, it was concluded that the strains from the fiber optic BOTDA sensor had good coincidence with those values of the conventional electrical strain gages.

An Exponential Smoothing Adaptive Failure Detector in the Dual Model of Heartbeat and Interaction

  • Yang, Zhiyong;Li, Chunlin;Liu, Yanpei;Liu, Yunchang;Xu, Lijun
    • Journal of Computing Science and Engineering
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    • 제8권1호
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    • pp.17-24
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    • 2014
  • In this paper, we propose a new implementation of a failure detector. The implementation uses a dual model of heartbeat and interaction. First, the heartbeat model is adopted to shorten the detection time, if the detection process does not receive the heartbeat message in the expected time. The interaction model is then used to check the process further. The expected time is calculated using the exponential smoothing method. Exponential smoothing can be used to estimate the next arrival time not only in the random data, but also in the data of linear trends. It is proven that the new detector in the paper can eventually be a perfect detector.

실험을 통한 소형 고감도 광섬유 하이드로폰의 감지성능 연구 (Experimental Study on Signal Sensing of a High Sensitive Fiber Optic Hydrophone)

  • 김정석;윤형규;설재수
    • 소음진동
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    • 제9권6호
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    • pp.1152-1156
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    • 1999
  • In this study, a fiber optic air-backed mandrel hydrophone has been constructed and performance of acoustic signal detection has been measured. The hydrophone is based on a Mach-Zehnder interferometer with 35 m of sensing fiber. The sensitivity is measured up to -128 dB re rad/$\mu$ Pa in range from 1.4 kHz to5 kHz. A system with this design of hydrophone may be applied to detect low frequency underwater acoustic signals.

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비틀린 광섬유 센서코일을 이용한 편광분석형 광섬유 전류센서 (Polarimetric fiber-optic current sensor system using a twisted fiber sensing coil)

  • 송민호;김기혁
    • 조명전기설비학회논문지
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    • 제18권2호
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    • pp.135-141
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    • 2004
  • 보호계전 시스템의 전류센서로 사용할 목적으로 편광분석형 광섬유 전류센서를 개발하였다. 광섬유의 선형복굴절에 의한 출력의 왜곡을 최소화하기 위하여 단일모드 광섬유를 미터 당 20회 이상 비틀고 그 끝단에 FRM(Faraday rotator mirror)을 부착하여 센서코일을 제작하였다. 광섬유 센서코일의 비틀림 정도를 달리하며 다양한 환경에서의 전류측정 실험을 행하였다. 실험결과로부터 광섬유 센서코일이 진동 등의 환경적 노이즈를 효율적으로 차단함을 알 수 있었으며 $\pm$3% 이내의 시스템 출력안정도를 얻었다.

광시스템에서 maximum 신호 Sensing을 위한 Algorithm 설계 (Design of Algorithm for maximum Signal Sensing by Optical System)

  • 최도순
    • 한국정보전자통신기술학회논문지
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    • 제3권4호
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    • pp.70-75
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    • 2010
  • 이 논문은 광케이블인 optical fiber를 통해 의료용 signal을 전송 할 때 porarization obtain fiber 에서 mono mode fiber로 교체되는 지점에 integrated optic인 wave conductor를 사용하여, optical signal intensity의 maximum를 sensing 하기 위한 Algorithm Brent을 설계하고 이를 검토하였다.

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광섬유를 이용한 고감도 압력센서 개발 (Development of high sensitivity pressure sensor using optical fiber)

  • 이권형;조경재;김현철
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 1995년도 추계학술대회 논문집
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    • pp.478-481
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    • 1995
  • This paper presents the system demonstrator for an optical fiber sensor system developed as a technological evaluator suitable for generic sensric sensing applications. The new type of fiber-optic sensor employed a diaphragm displacement transforms pressure into optical intensity. Form this sensing technique, we can know the variation of source intensity, the loss of a optical fiber, and the reflectivity of the diaphragm surface. Experimental results are applied to the low-pressure transducer suitable for measuring miniature pressure.

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Fiber-optic humidity sensor system for the monitoring and detection of coolant leakage in nuclear power plants

  • Kim, Hye Jin;Shin, Hyun Young;Pyeon, Cheol Ho;Kim, Sin;Lee, Bongsoo
    • Nuclear Engineering and Technology
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    • 제52권8호
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    • pp.1689-1696
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    • 2020
  • In this study, we developed a fiber-optic humidity sensor (FOHS) system for the monitoring and detection of coolant leakage in nuclear power plants. The FOHS system includes an FOHS, a spectrometer, a halogen white-light source, and a Y-coupler. The FOHS is composed of a humidity-sensing material, a metal tube, a multi-mode plastic optical fiber, and a subminiature version A (SMA) fiber-optic connector. The humidity-sensing material is synthesized from a mixture of polyvinylidene fluoride (PVDF) in dimethyl sulfoxide (DMSO) and hydroxyethyl cellulose (HEC) in distilled water. We measured the optical intensity of the light signals reflected from the FOHS placed inside the humidity chamber with relative humidity (RH) variation from 40 to 95%. We found that the optical intensity of the sensing probe increased linearly with the RH. The reversibility and reproducibility of the FOHS were also evaluated.

Performance monitoring of offshore PHC pipe pile using BOFDA-based distributed fiber optic sensing system

  • Zheng, Xing;Shi, Bin;Zhu, Hong-Hu;Zhang, Cheng-Cheng;Wang, Xing;Sun, Meng-Ya
    • Geomechanics and Engineering
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    • 제24권4호
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    • pp.337-348
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    • 2021
  • Brillouin Optical Frequency Domain Analysis (BOFDA) is a distributed fiber optic sensing (DFOS) technique that has unique advantages for performance monitoring of piles. However, the complicated production process and harsh operating environment of offshore PHC pipe piles make it difficult to apply this method to pile load testing. In this study, sensing cables were successfully pre-installed into an offshore PHC pipe pile directly for the first time and the BOFDA technique was used for in-situ monitoring of the pile under axial load. High-resolution strain and internal force distributions along the pile were obtained by the BOFDA sensing system. A finite element analysis incorporating the Degradation and Hardening Hyperbolic Model (DHHM) was carried out to evaluate and predict the performance of the pile, which provides an improved insight into the offshore pile-soil interaction mechanism.