• Title, Summary, Keyword: Optical fiber sensor

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Wireless Optical Fiber Interferometer Arterial Pulse Wave Sensor System (무선 기반의 광섬유 간섭계형 맥파센서 시스템)

  • Park, Jaehee;Shin, Jong-Dug
    • Journal of Sensor Science and Technology
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    • v.22 no.6
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    • pp.439-443
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    • 2013
  • A wireless optical fiber interferometer arterial pulse wave sensor system is developed for remote sensing. The wireless optical fiber sensor system consists of Zigbee communication modules and an optical fiber interferometer arterial pulse wave sensor. The optical fiber arterial pulse wave sensor is an in-line Michelson interferometer enclosed with steel reinforcement in a heat-shrinkable tube. The Zigbee communication modules are composed of an ATmega128L microprocessor and a CC2420 Zigbee chip. The arterial pulse waves detected by the optical fiber sensor were transmitted and received via the Zigbee communication modules. The experimental results show that the wireless optical fiber sensor system can be used for monitoring the arterial pulse waves remotely.

A Study of the Non-Contact Bill Counter using Optical Fiber Sensor (광섬유 센서를 이용한 지폐 계수 장치에 관한 연구)

  • Kang, Dae-Hwa;Shin, Woo-Cheol;Song, Doo-Sang;Jang, Tak-Soon;Hong, June-Hee
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.16 no.6
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    • pp.231-236
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    • 2007
  • In this paper, we studied the possibility of non-contact bill counting method using optical fiber sensor instead of traditionally used friction counting method. To implement non-contact counting, we designed and made optical fiber sensor and related parts. optical fiber sensor is made of optical fiber of 1mm diameter, photo diode and laser diode. Based on the conclusion which derived from preliminary experiment, instrument part is designed to make unevenness on the surface of bill paper and to stay parallel with optical fiber section. By analyzing the signal of optical sensor, we made counting program. Experimental instrument is composed of sensor part, instrument part, signal handling part. We checked the possibility of non-contact counting method after implementing experiment by using optical fiber sensor and instrument part.

Damage and Failure Detection of CFRP Using Optical Fiber Vibration Sensor (광섬유 진동센서를 이용한 탄소섬유강화 복합재료의 손상 및 파손검출)

  • 양유창;한경섭
    • Proceedings of the Korean Society For Composite Materials Conference
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    • pp.254-257
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    • 2001
  • An intensity-based optical fiber vibration sensor is applied to detect and evaluate damages and fiber failure of composites. The optical fiber vibration sensor is constructed by placing two cleaved fiber end, one of which is cantilevered in a hollow glass tube. The movement of the cantilevered section lags behind the rest of the sensor in response to an applied vibration and the amount of light coupled between the two fibers is thereby modulated. Vibration characteristics of the optical fiber vibration sensor are investigated. Surface mounted optical fiber vibration sensor is used in tensile and indentation test. Experimental results show that the optical fiber sensor can detect damages and fiber failure of composites correctly.

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Damage and Failure Detection of Composites Using Optical Fiber Vibration Sensor (광섬유 진동센서를 이용한 복합재료의 손상 및 파손검출)

  • Yang, Y.C.;Han, K.S.
    • Proceedings of the KSME Conference
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    • pp.547-552
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    • 2001
  • An intensity-based optical fiber vibration sensor is applied to detect and evaluate damages and fiber failure of composites. The optical fiber vibration sensor is constructed by placing two cleaved fiber end, one of which is cantilevered in a hollow glass tube. The movement of the cantilevered section lags behind the rest of the sensor in response to an applied vibration and the amount of light coupled between the two fibers is thereby modulated. Vibration characteristics of the optical fiber vibration sensor are investigated. Surface mounted optical fiber vibration sensor is used in tensile and indentation test. Experimental results show that the optical fiber sensor can detect damages and fiber failure of composites correctly.

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A Study on the Performance of Optical Fiber Displacement Sensor for Monitoring High Speed Spindle according to Properties of Optical Fiber (고속주축 모니터링용 광파이버 변위센서의 파이버 특성에 따른 센서 성능 연구)

  • 박찬규;신우철;배완성;홍준희;이동주
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • pp.385-389
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    • 2003
  • To make high speed spindle system work properly, sensors with outstanding resolution and dynamic characteristics are essential. An optical fiber displacement sensor is based on simple principles. Electrical signal responds to the optical flux change due to the displacement change between a target and a sensor probe. In this paper, the performance of optical fiber displacement sensor has been investigated according to properties of optical fiber Firstly, optical loss has been measured before and after polishing optical fiber endface. Secondly, allowance of optical fiber bending has been tested. thirdly sensitivity and linear range of the sensor has been found out according to the shape of cross section of optical fiber.

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Development of Ultrasonic-Optical Fiber Sensor and its Applications (초음파-광섬유 센서의 개발과 그 응용)

  • Oh, Il-Kwon;Lim, Seung-Hyun
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.169-174
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    • 2006
  • The outstanding mechanical property of optical fiber and the merits of acoustic emission sensing technique are unified for novel sensor system. The generated ultrasonic wave from piezoelectric generator are propagated along the optical fiber and also sensed. The propagated wave can be influence by external pressure on the optical fiber or environmental circumstance. The optical fiber sensor using ultrasonic wave has advantages compare with existing sensor system. In this study, the sensitivity of the optical fiber sensor is experimentally investigated. As the applications of the optical fiber sensor system using piezoelectric ultrasonic waves, the point load on the optical fiber is measured and the monitoring system for the void fraction of two phase flows is developed. The experimental results show the linear relationship between sensed voltage and void fraction.

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Damage Detection of Fiber-Metal Laminates Using Optical Fiber Sensors (광섬유 센서를 이용한 섬유-금속 적층판의 손상 감지)

  • 양유창;한경섭
    • Proceedings of the Korean Society For Composite Materials Conference
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    • pp.161-164
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    • 2002
  • Optical fiber vibrations sensors (OFVSs) and extrinsic Fabry-Perot interferometer (EFPI) were used in damage monitoring of fiber-metal laminates(FML). The optical fiber vibration sensor and EFPI were applied in order to detect and evaluate the strain, damage and failure of FML. Damages in composites, such as matrix cracks, delamination and fiber breakage may occur as a result of excessive load, fatigue and low-velocity impacts. Tensile test was performed with the measurement of optical signal and acoustic emission (AE). The signals of the optical fiber vibration sensor due to damages were quantitatively evaluated by wavelet transform. EFPI was less sensible to the damage signals compared with the optical fiber vibration sensor. It was found that damage information of comparable in quality to acoustic emission data could be obtained from the optical fiber vibration sensor signals.

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

  • 이권형;조경재;김현철
    • Proceedings of the Korean Society of Precision Engineering Conference
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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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Remote Monitoring of Abrupt Overflowing in Common Utility Duct Using Reflective Side-Polished Optical Fiber Submersion Sensor

  • Lee, Cherl-Hee;Kim, Cheol;Kang, Shin-Won;Song, Jae-Won
    • Journal of the Optical Society of Korea
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    • v.12 no.3
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    • pp.166-169
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    • 2008
  • The submersion monitoring system based on a reflective side-polished optical fiber submersion sensor with an optical fiber mirror was shown to be an effective alarm system with remote monitoringwhen the drainage capacity of a common utility duct is exceeded due to heavy rainfall. The proposed sensor was connected to an existing installed optical fiber network at a height of 250mm in a common utility duct, and then tested under sample materials(distilled water, river water, sea water, foul water, muddy water, petroleum, edible oil) at a distance of 1km from the sensor for remote sensing. In experiments, the proposed real-time sensor system reduced maintenance cost and improved monitoring efficiency by using a reflection-type side-polished optical fiber submersion sensor efficient for remote monitoring of a common utility duct.

Fabrication of Optical Fiber Gas Sensor with Polyaniline Clad

  • Lee, Yun-Su;Song, Kap-Duk;Joo, Byung-Su;Lee, Sang-Mun;Choi, Nak-Jin;Lee, Duk-Dong;Huh, Jeung-Soo
    • Journal of Sensor Science and Technology
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    • v.13 no.2
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    • pp.96-100
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    • 2004
  • Optical fiber sensors have been used to detect small amounts of chemical species. In this work, a new thin polymer-clad fiber sensor is developed. Polyaniline is chemically synthesized and thin clad layers of the polymer are easily deposited on optical fiber by dip-coating technique. The optical property of polyaniline as a sensing material is analyzed by UV-Vis-NIR. The light source is stabilized He-Ne laser at 635 nm wavelength with 1 mW power. The light power transmitted through the optical fiber is measured with a spectrophotometer. By selecting a fixed incident angle, variation of transmitted light intensity through the optical fiber can be detected as gas molecules absorbed in the polyaniline clad layer. Among the various gases, the fabricated optical fiber sensor shows good sensitivity to $NH_{3}$ gas. The optical fiber sensors was shown more improved properties than polymer based sensors which measure conductivity changes.