• Title, Summary, Keyword: Optical fiber

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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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Formation of metal nano particles on optical fiber for fiber optic localized surface plasmon resonance sensor (광섬유 국소화 표면 플라즈몬 공명 센서를 위한 광섬유 표면상의 금속 나노 입자 형성)

  • Lee, Hoon;Lee, Seung-Ki
    • Journal of Sensor Science and Technology
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    • v.17 no.2
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    • pp.95-99
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    • 2008
  • Various etching methods of optical fiber and formation of metal nano particles on the optical fiber have been proposed for fabrication of fiber optic localized surface plasmon resonance (FO LSPR) biosensors. Different types of etched optical fiber are possible by removing the cladding of optical fiber using HF (hydrofluoric acid) solution and BHF (buffered hydrofluoric acid) solution, which results in improved surface roughness when BHF solution is used. Localized surface plasmon can be formed and measured by formation of silver and gold nano particles on the etched optical fiber. The characteristics of the etched optical fiber and metal nano particles on the etched surface of the optical fiber play a key role in dictating the sensitivity of the LSPR sensors, so that the proposed results can be expected to be applied for related research on fiber optic based biosensors.

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 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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Characteristic of Transient Response in Nonuniform Instability with Optically Controlled Fiber (광학적으로 제어된 섬유를 가진 비균일 불안정성의 과도 응답의 특성)

  • Han, Pan-Lin;Park, Kwang-Chea
    • The Journal of Korea Institute of Information, Electronics, and Communication Technology
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    • v.9 no.5
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    • pp.445-450
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    • 2016
  • In this paper we study the effect of chaos in nonuniform instability with optical fiber based IoT networks. The transient response of optically controlled fiber has also described. Nonlinear optical fiber effects especially fiber scattering in networks has emerged as the essential means active optical devices. The paradigm instability in fiber Internet serves as a test for fundamental study of chaos and its suppression and exploitation in practical application in optical communication. This paper attempts to present a survey and some of our research findings on the nature of chaotic effect on Internet based optical communication. The transient response in optical fiber has been evaluated theoretically by calculating the variation of the scattering function. The lines has used under open ended termination containing optically induced region. The scattered optical waves in a fiber used in optic communications are temporally unstable above certain threshold intensity.

The Reliability of Optical Fiber Assembly Using Glass Solder

  • Lee, Jong-Jing;Kang, Hyun-Seo;Koh, Jai-Sang
    • Proceedings of the Korean Reliability Society Conference
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    • pp.147-151
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    • 2004
  • In this study, an optical fiber assembly directly coupled with a laser diode or a photo diode is designed to confirm high reliable optical coupling efficiency of optical transmitter(Tx) and receiver(Rx). The optical fiber assembly is fabricated by soldering an optical fiber and a Kovar ferrule using a glass solder after inserting an optical fiber through a Kovar ferrule. The Kovar which has good welding characteristics is applied to introduce laser welding technique. The glass solder has excellent thermal characteristics such as thermal shift delamination compared with PbSn, AuSn solder previously used usually. Furthermore, the glass solder doesn't need fiber metalization and this enables low cost fabrication. However, the glass soldering is high temperature process over 35$0^{\circ}C$ and the convex shape after solidification due to surface tension causes the stress concentration on optical fiber. The stress concentration on the optical fiber increases the optical insertion loss and possibility of crack formation. The shape of glass solder was designed referring to 2-D Axi-symmetric FEM simulation. To test the mechanical reliability, mechanical vibration test and shock test were done according to Telcorida GR-468-Core protocol. After each test, the optical loss of the stress distributed fiber assembly didn't exceed 0.5 dB, which passes the test.

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Specialty Fiber Coupler: Fabrications and Applications

  • Lee, Byeong-Ha;Eom, Joo-Beom;Park, Kwan-Seob;Park, Seong-Jun;Ju, Myeong-Jin
    • Journal of the Optical Society of Korea
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    • v.14 no.4
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    • pp.326-332
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    • 2010
  • We review the research on specialty fiber couplers with emphasis placed on the characteristics that make them attractive for biomedical imaging, optical communications, and sensing applications. The fabrication of fiber couplers has been carried out with, in addition to conventional single mode fiber, various specialty fibers such as photonic crystal fiber, double clad fiber, and hole-assisted fiber with a Ge-doped core. For the fiber coupler fabrication, the side polishing and the fused biconical tapered methods have been developed. These specialty fiber couplers have been applied to optical coherence tomography, fluorescence spectroscopy, fiber sensors, and optical communication systems. This review aims to provide a detailed statement on the recent progress and novel applications of specialty fiber couplers.

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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