• Title/Summary/Keyword: Optic Design

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Design of Fiber Optic Gyroscope for Sensing High Rotation (고속회전 감지 광섬유자이로 설계)

  • Do, Jae-Chul;Chong, Kyoung-Ho;Jo, Min-Sik;Song, Ki-Won;Moon, Hong-Key
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.37 no.6
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    • pp.551-555
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    • 2009
  • We studied the design of fiber optic gyroscope that enables to sense high rotation by extending the limit of rotation sensibility of fiber optic interferometer. Based on the digital serrodyne modulation technique, the signal processing of fiber optic gyroscope was designed and the prototype fiber optic gyroscope showed the high rotation sensibility up to ${\pm}3000[deg/sec]$ and scale factor performance of about 150[ppm] by the experiments. Accordingly, we confirmed that the design of fiber optic gyroscope was valid for high rotation.

A study on single body design of optical current sensor and optical voltage sensor (광전류/광전압 센서의 일체화 설계에 관한 연구)

  • 김영수;김요희
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.21 no.6
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    • pp.1596-1603
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    • 1996
  • A single body type of fiber-optic current and voltae sensor using a rare earth doped YIG and a bismuth silicon oxide single crystsl is proposed, which is used for simultaneous measurement of the AC electric current and AC electric voltage over the trasmission lines. Experimental results showed that the fiber-optic current sensor has the maximum 7.5% error within the current range of 0A to 400A, and the fiber-optic voltage sensor has the maximum 0.87% error within the current range of 0V to 400V. The output waveforms of proposed fiber-optic sensor system has a good agreement with output waveforms of conductor current and voltage. Experimental results proved that the output of fiber-optic current sensor is not affected by the electric voltage applied to the fiber-optic voltage sensor, and also, that the output of fiber-optic voltage sensor is not affected by the electric current applied to the fiber-optic current sensor.

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Application of Birefringence CAE in Mould Design of Optic Lens Injection Molding Process (광학렌즈 사출성형금형 설계에 있어서 CAE기술의 활용)

  • Yamanoi, Mikio;Kwak, Tae-Soo;Jung, Jong-Kyo
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.11 no.3
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    • pp.1-6
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    • 2012
  • This study is focused on simulation technology in injection molding process for plastic optic lenses. The CAE program, $3D-TIMON^{TM}$ is used for the injection molding simulation with O-PET resin material. The design for different gate shape and runner layout has been under review by CAE simulation results. Moreover, the prediction of birefringence and polarized light in injection molded optic lenses has been tested by the CAE Program. The simulation results have been expected to effectively use in the design of injection molding mould.

Optimal Design of Fiber-optic Surface Plasmon Resonance Sensors

  • Jung, Jae-Hoon;Kim, Min-Wook
    • Journal of the Optical Society of Korea
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    • v.11 no.2
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    • pp.55-58
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    • 2007
  • We propose a systematic method for design of fiber-optic surface plasmon resonance (SPR) sensors. We used rigorous coupled wave analysis (RCWA) for analysis of the transmission spectrum, and the (1+1) evolution strategy (ES) was employed as an optimization tool. The simulation results show that the optimization method presented here is very useful in designing fiber-optic SPR sensor for strain and temperature measurement. This algorithm can be extended to another objective function with other weighting factors and optical parameters.

Design and Performance Evaluation of Fiber Optic Gyro with Digital Closed-loop Processing (디지털 폐루프 신호처리를 적용한 광섬유 자이로 설계 및 성능평가)

  • 도재철;정경호
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.34 no.9
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    • pp.97-103
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    • 2006
  • This paper described the design and performance evaluation of fiber optic gyro using digital closed-loop processing. For the feedback to null the gyro input rate, digital serrodyne modulation was employed, and for scale factor stabilization, the control circuits of modulation amplitude and optical power are implemented. Performance tests show that prototype fiber optic gyro has bias stability of 0.34 deg/hr, scale factor non-lineality of about 100ppm, and maximum measurement range of ${\pm}500$ deg/sec.

A Study on the Analysis of $1{\times}2$ Polymer Waveguide Thermo-optic switch ($1{\times}2$ 열광학 폴리머 광스위치의 해석에 관한 연구)

  • 곽혁용;김종헌
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 1998.06a
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    • pp.247-251
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    • 1998
  • This work presents the analysis of $1\times2$ polymer waveguide thermo-optic switch using asymmetric Y-splitter at the wavelength of 1300nm. Because of the high thermo-optic coefficient of polymeric materials the design of efficient switches were feasible. For the numerical simulation of these switches the finite difference beam propagation method has been employed. Design rules for a $1\times2$ polymeric switch have been defined by using the numerical techniques.

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Design of 10Gbps CMOS Receiver Circuits for Fiber-Optic Communication (광통신용 10Gbps CMOS 수신기 회로 설계)

  • Park, Sung-Kyung;Lee, Young-Jae;Byun, Sang-Jin
    • Journal of IKEEE
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    • v.14 no.4
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    • pp.283-290
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    • 2010
  • This study is on the design of 10Gbps CMOS receiver circuits for fiber-optic communication. The receiver is made up of a photodiode, a transimpedance amplifier, a limiting amplifier, an equalizer, a clock and data recovery loop circuit, and a demultiplexer or demux with some auxiliary circuits including I/O circuits. Various wideband or high-speed circuit techniques are harnessed to realize a feasible, effective, and reliable receiver for a SONET fiber-optic standard, OC-192.

Research on Damage Identification of Buried Pipeline Based on Fiber Optic Vibration Signal

  • Weihong Lin;Wei Peng;Yong Kong;Zimin Shen;Yuzhou Du;Leihong Zhang;Dawei Zhang
    • Current Optics and Photonics
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    • v.7 no.5
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    • pp.511-517
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    • 2023
  • Pipelines play an important role in urban water supply and drainage, oil and gas transmission, etc. This paper presents a technique for pattern recognition of fiber optic vibration signals collected by a distributed vibration sensing (DVS) system using a deep learning residual network (ResNet). The optical fiber is laid on the pipeline, and the signal is collected by the DVS system and converted into a 64 × 64 single-channel grayscale image. The grayscale image is input into the ResNet to extract features, and finally the K-nearest-neighbors (KNN) algorithm is used to achieve the classification and recognition of pipeline damage.

Applications of fiber optic sensors for structural health monitoring

  • Kesavan, K.;Ravisankar, K.;Parivallal, S.;Sreeshylam, P.
    • Smart Structures and Systems
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    • v.1 no.4
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    • pp.355-368
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    • 2005
  • Large and complex structures are being built now-a-days and, they are required to be functional even under extreme loading and environmental conditions. In order to meet the safety and maintenance demands, there is a need to build sensors integrated structural system, which can sense and provide necessary information about the structural response to complex loading and environment. Sophisticated tools have been developed for the design and construction of civil engineering structures. However, very little has been accomplished in the area of monitoring and rehabilitation. The employment of appropriate sensor is therefore crucial, and efforts must be directed towards non-destructive testing techniques that remain functional throughout the life of the structure. Fiber optic sensors are emerging as a superior non-destructive tool for evaluating the health of civil engineering structures. Flexibility, small in size and corrosion resistance of optical fibers allow them to be directly embedded in concrete structures. The inherent advantages of fiber optic sensors over conventional sensors include high resolution, ability to work in difficult environment, immunity from electromagnetic interference, large band width of signal, low noise and high sensitivity. This paper brings out the potential and current status of technology of fiber optic sensors for civil engineering applications. The importance of employing fiber optic sensors for health monitoring of civil engineering structures has been highlighted. Details of laboratory studies carried out on fiber optic strain sensors to assess their suitability for civil engineering applications are also covered.