• 제목/요약/키워드: fiber sensor

검색결과 1,227건 처리시간 0.028초

전광파이버형 광파이버 자이로 (All-Fiber Optic Gyroscope)

  • 김인수;김요희
    • 대한전기학회:학술대회논문집
    • /
    • 대한전기학회 1998년도 하계학술대회 논문집 E
    • /
    • pp.1840-1842
    • /
    • 1998
  • Gyroscope is a very important core sensor, as a rotation sensor in inertial space, in inertial guidance and navigation system on aeronautics, plane, vessel and so on for civilian and millitary applications. Mechnical gyroscopes, adopting a principle of spinning a top, have been used in many application system. These mechnical gyroscopes need high power consumption, long warming time and complicated peripheral devices. But fiber-optic gyroscopes, based on the Sagnac effect, have novel advantages as small volume. simple scheme, low power consumption and high reliability. So we have developed a Intermediate grade All-fiber Optic Gyroscope, which has open-loop and minimum reciprocal configuration scheme. We have designed feedback circuits for stability of amplitude and phase using four lock-in amplifier(LIA) circuits and also used for noise limitation. This paper describes the scheme of optical part and electronic part and also test results of this all-fiber optic gyroscope. The performance have been achieved as long-term bias drift of $9.54^{\circ}/h$, random walk of $0.0317^{\circ}/\sqrt{h}$ and dynamic range of ${\pm}150\;deg/s$.

  • PDF

$Ga_2O_3$ 첨가에 따른 $SiO_2-PbO-K_2O-Al_2O_ 3$계 적외선 센서용 glass fiber의 특성 (Properties of glass fiber by adding $Ga_2O_3$ in the $SiO_2-PbO-K_2O-Al_2O_ 3$ system for infrared sensor)

  • 이명원;윤상하;강원호
    • E2M - 전기 전자와 첨단 소재
    • /
    • 제9권10호
    • /
    • pp.1047-1052
    • /
    • 1996
  • In this study, the thermal and optical proper-ties of multicomponent oxide glass fiber for IR sensor by adding heavy metal oxide Ga$_{2}$O$_{3}$ were investigated. The fiber samples were made by rod-in tube method. The optical loss of fiber was measured in 0.3-1.8/M wavelength region. As Ga$_{2}$O$_{3}$ increased up to 12wt%, the transition and softening temperature of bulk glass were increased from 495.deg. C to 564.deg. C and from 548.deg. C to 612.deg. C respectively. Whereas the thermal expansion coefficient was decreased from 102 to 88.2*10$^{-7}$ /.deg. C. The refractive index was increased from 1.621 to 1.662, and IR cut-off wavelength was enlarged from 4.64.mu.m to 5.22.mu.m. The optical loss of fiber was decreased and more remarkably decreased in 1.146.mu.m-1.8.mu.m wavelength region.

  • PDF

Analysis of Breath from Diabetic Patients Based on a One-chip-type Sensor Array

  • Yu, Joon-Boo;Jang, Byoung Kuk;Byun, Hyung-Gi
    • 센서학회지
    • /
    • 제28권4호
    • /
    • pp.221-224
    • /
    • 2019
  • Based on the results of studies on acetone excretion in diabetic patients, a one - chip sensors array was fabricated by combining acetone-selective sensor materials and volatile-organic-compound sensitive sensor materials. An electonic-nose was implemented using a sensor array and confirmed selectivity for five gases. In this system, the excretion of diabetic patients and controls was sampled with solid phase microextraction fiber and transferred to the sensor array. Although the control and diabetic patients were distinct, several samples failed. In the control group, the results of blood tests were normal, but patients were highly obese. In addition, the gas chromatography mass spectrometry results for the subjects revealed chemicals that are external factors.

Characterization of Surface Quality in Orthogonal Cutting of Glass Fiber Reinforced Plastics

  • Choi Gi Heung
    • International Journal of Safety
    • /
    • 제3권1호
    • /
    • pp.1-5
    • /
    • 2004
  • This study discusses frequency analysis based on autoregressive (AR) time series model, and the characterization of surface quality in orthogonal cutting of a fiber-matrix composite materials. A sparsely distributed idealized composite material, namely a glass reinforced polyester (GFRP) was used as workpiece. Analysis method employs a force sensor and the signals from the sensor are processed using AR time series model. The experimental correlations between the fiber pull-out and AR model coefficients are then established.

구조 건전성 모니터링을 위한 광섬유 변위 센서 시스템 개발 (Fiber Optic Displacement Sensor System for Structural Health Monitoring)

  • 이건호;안병준;김대현
    • 비파괴검사학회지
    • /
    • 제31권4호
    • /
    • pp.374-381
    • /
    • 2011
  • 최근 구조 건전성 모니터링을 위해 다양한 센서와 분석 기술들을 적용하여 기계/토목 구조물의 처짐을 측정하는 연구들이 활발히 수행되고 있다. 처짐을 측정하기 위해 사용되는 다양한 전기 기반 상용 센서의 경우, 많은 수의 센서가 설치될 때 함께 설치된 다량의 전선들은 전기적 잡음 문제를 야기하여 사용상의 어려움을 발생시킨다. 따라서 본 논문에서는 기본 센서의 문제점을 해결하면서 미세 변위를 손쉽게 측정할 수 있는 저가형의 광강도형 광섬유 변위 센서를 제안한다. 이를 위해, 광섬유 굽힘 손실 현상을 이용하여 센서부의 형태를 고안하였으며 민감도, 선형성 그리고 작동 범위를 구하기 위한 기초 실험을 수행하였다. 또한 변위 측정이 용이하고 구조물에 손쉽게 설치할 수 있도록 센서 헤드의 기구부를 새롭게 설계 제작하였으며, 이를 사용하기 위한 실시간 프로그램 또한 함께 개발하여 광섬유 변위 센서 시스템을 개발 완료하였다.

큰 복굴절 특성을 가지는 광자결정 광섬유를 이용한 스트레인, 구부림 및 온도 특성 (Highly-birefringent Photonic Crystal Fiber with Squeezed Lattice for Strain, Curvature and Temperature Sensing)

  • 엄성훈;김길환;황규진;마경식;이관일;정제명;이상배
    • 한국광학회지
    • /
    • 제21권6호
    • /
    • pp.230-234
    • /
    • 2010
  • 큰 복굴절 값을 갖는 광자결정광섬유는 실리카 단일 물질로 구성되어 온도 민감성이 매우 낮다. 이를 이용하여 온도변화에 영향을 받지 않는 스트레인 및 구부림 센서를 구현하였다. 이때, 스트레인 변화에 따른 민감도는 $1.41\;pm/{\mu}{\varepsilon}$ 이고, 구부림에 대한 민감도는 타원코어 장축 방향과 단축 방향으로의 구부렸을 때 각각 $0.93\;nm/m^{-1}$, $-1.6\;nm/m^{-1}$ 로 차이가 있었다.

열변성 물질을 이용한 지하수 온도 측정용 광섬유 온도센서의 특성분석 (Characteristic analysis of a thermochromic material based fiber-optic temperature sensor for measuring temperature of subsurface water)

  • 서정기;유욱재;조동현;장경원;허지연;이봉수;고용권
    • 센서학회지
    • /
    • 제18권6호
    • /
    • pp.467-474
    • /
    • 2009
  • In this study, we describe the feasibility of developing a fiber-optic temperature sensor using a thermochromic material such as 2,4,5-triphenylimidazole or also called Lophine. A sensor-tip is fabricated by mixing of a Lophine powder, which has a non-toxic and hydrophobic characteristics, and an epoxy resin. The temperature change in the sensor-tip gives rise to a change in the optical absorbance of the Lophine, and the transmittance of a light through the Lophine is also changed. We have measured the intensities of modulated lights due to the change of optical absorbance of the Lophine by using of a photo-multiplier tube(PMT). The relationships between the temperatures and the output voltages of PMT are determined to measure the temperature of water. The measurable temperature range of the fiber-optic sensor is from 5 to $30^{\circ}C$.

비접촉 ID카드 계수를 위한 자동화 시스템 개발 (Study on Development of Automation System for Non-Contact Counting of ID Card)

  • 강대화;홍준희;곽양양;이혁원
    • 한국생산제조학회지
    • /
    • 제22권4호
    • /
    • pp.652-657
    • /
    • 2013
  • In this study, we developed a counting method for non-contact ID cards using an optical fiber displacement sensor instead of the traditionally used friction counting method. The proposed method has the advantage of high speed and automated measurement. For counting non-contact ID cards, an H-type optical fiber sensor, jig part, and counting program are developed separately to build the system and adjust it. Through the experimental test results, it was confirmed that counting is possible with one type of international ID card and one type of financial security card based on ISO7810. Furthermore, by applying the proposed method to 100 ID cards 100 times repeatedly, it was confirmed that it has high accuracy and an error ratio of 0%. We experimentally demonstrated that the proposed counting method for non-contact ID cards using an optical fiber displacement sensor can perform measurements with high accuracy and high speed.

광섬유 격자 센서와 빔 커플러를 사용한 회전중인 블레이드의 변형률 측정 방법 (On-line Strain Measurement of Rotating Blade Using Fiber Bragg Grating Sensors and Beam Coupler)

  • 이인재;이종민;이상배;황요하
    • 한국소음진동공학회논문집
    • /
    • 제16권11호
    • /
    • pp.1172-1178
    • /
    • 2006
  • Measurement of blade strain with sensors directly installed on the blade has one critical issue, how to send the sensor signal to the ground. Strain-gauges have been dominantly used to directly measure stress of a blade and either a slip ring or a telemetry system has to be used to send measured signal to the ground. However, both systems have many inherent problems and sometimes very severe limitations to be practically used. In this paper, new on-line strain monitoring method using. FBG(Fiber Bragg Grating) sensors and a beam coupler is introduced. Measurement of rotor stress using FBG sensors is nothing new, but unlike other system which installs all necessary instruments on the rotor and use telemetry system to send data to the ground, this system makes use of light's unique characteristic - light travels through space. In this new approach, single optical fiber with many FBG sensors is installed on the blade and all other necessary instruments can be installed at ground thereby giving tremendous advantages over slip ring or telemetry system. A reference sensor is also introduced to compensate the beam coupler's transmission loss change due to rotation. The suggested system's good performance is demonstrated with experiments.