• Title/Summary/Keyword: 자기장센서

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Research of detect of the object in stainless pipe using the magnetic inductance (자기인덕턴스를 이용한 Stainless Steel 배관 내 이물질 검사에 대한 연구)

  • Joo, Gun-June;Park, Gwan-Soo
    • Proceedings of the KIEE Conference
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    • 2006.04b
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    • pp.179-181
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    • 2006
  • 각 원자력 발전소에서는 정밀성, 안전성을 확인하는 검사의 중요성을 인식하여 LPMS(Loose Part Monitoring System)을 사용하여 사고 징후를 조기에 감지하여 이에 대한 예방조치를 가능케 함으로써 설계기준 사고 발생을 사전에 방지할 수 있게 한다. 또한 이 기술은 신호 측정 및 분석 등의 기반기술 개발을 통하여 건전성 감시 기술의 신뢰성을 향상 시키고 있다. LPMS(Loose Part Monitoring System)기술은 재료, 기기, 구조물 등의 성질과 내부조직을 변화시키거나 파괴하지 않고, 배관내부에 흐르는 금속 파편들을 찾아내어 정밀성, 안전성, 신뢰성을 확보하기 위하여 검사기술이 적용되고 있다. 그러나 이 방법은 배관내의 이물질의 충격이 발생해야 감지가 가능하고, 이물질의 모양이나 사이즈를 확인하기에는 어려움이 있다. 따라서 본 논문에서는 배관외부에서 자기장을 인가하여, 배관내의 이물질에 변화하는 자기장을 홀센서로 측정하여 기존의 LPMS 방식을 보완하는 시스템을 개발하기 위해, 배관에 필요한 자기장 발생장치를 설계하고, 이물질을 검출하기 위한 검출 감도향상에 대해 연구하였다.

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Study on Improvement of Deperming Performance Applied Dead Time (Dead Time 적용에 따른 탈자 성능향상에 관한 연구)

  • Kim, Jong-Wang;Kim, Ji-Ho;Chung, Hyun-Ju;Lee, Hyang-Beom
    • Proceedings of the KIEE Conference
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    • 2011.07a
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    • pp.1065-1066
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    • 2011
  • 본 논문에서는 함정의 피탐지 성능 개선을 위한 기초 연구로 dead time 적용시 탈자 프로토콜 변화에 따른 탈자 성능 분석에 관한 연구를 하였다. 함정의 재질은 SM45C로 원통의 형태이다. 자기장 측정에 사용한 자기센서는 영국 Bartington Instruments사의 MAG-03MCB70(Three-Axis Fluxgate Magnetometer)을 사용하였으며, inter-cardinal run 방법을 이용하여 유도자기장과 영구자기장을 분리하였다. Anhyteretic deperm 프로토콜을 적용하여 탈자를 진행하였고 전류의 지속시간이 증가하는 경우에 비하여 dead time을 적용하였을 경우 탈자 성능이 향상된 결과를 얻을 수 있었다.

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Magnetic Bio-Sensor Using Planar Hall Effect (평면홀 효과를 이용한 자기 바이오센서)

  • Oh, Sun-Jong;Hung, Tran Quang;Kumar., S. Ananda;Kim, Cheol-Gi;Kim, Dong-Young
    • Journal of the Korean Society for Nondestructive Testing
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    • v.28 no.5
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    • pp.421-426
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    • 2008
  • The magnetic bio-sensor used the PHR (planar hall resistance) effect generated by the free layer in spin-valve giant magnetoresistance structure of Ta/NiFe/CoFe/Cu/NiFe/IrMn/Ta. The PHR element with micrometer size was fabricated through the photolithograph and dry etching process. The PHR signal with magnetic field was measured under the conditions of with and without single magnetic bead. A single magnetic bead of diameter $2.8\;{\mu}m$ was successfully detected using the PHR sensor. Therefore, the high resolution PHR sensor can be applied to bio-sensor application utilizing the output voltage variation of the PHR signals in the presence and absence of a single magnetic bead.

AC Current Sensor Using Air Core (공심코어를 사용한 교류전류 센서)

  • Park, Young-Tae;Jung, Jae-Kap
    • Journal of the Korean Magnetics Society
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    • v.15 no.1
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    • pp.48-52
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    • 2005
  • This paper describes a current sensor for precision current measurement of an electronic watt-hour meter that is going to install in houses in the future. As the current sensor is based on an cored principle (the Rogowski principle) it is not subject to usual limitations of saturation and non-linearity of general current transformers. An advantage of the developed current sensor is that non-linearity error in low current range is improved and the construction can be kept simple using an air core. We present a magnetic field analysis of the sensor using a finite-element solver. We compared the measured values versus the calculated values.

Steering Control for Autonomous Electric Vehicle using Magetic Fields (자기장을 이용한 자율주행 전기자동차의 조향제어)

  • Kim, Tae-Gon;Son, Seok-Jun;Ryoo, Young-Jae;Kim, Eui-Sun;Lim, Young-Cheol
    • Journal of Sensor Science and Technology
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    • v.10 no.2
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    • pp.134-141
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    • 2001
  • This paper describes a method to steer an autonomous electric vehicle using magnetic fields. Magnets are embeded along the center of the road and a magneto-resistive sensor is mounted beneath the front bumper of the vehicle. As the vehicle moves along the road neural network controller controls the vehicle using measured magnetic field variation. Based on a single magnets modeling equation, we analyzed three dimensional magnetic field distributions of embeded magnets in series on the center of the road and performed a computer simulation using this results. In simulation study, straight and curved road was configured. The steering controller for the vehicle was designed using neural network and experiment was performed on the real embeded magnets using real autonomous electric vehicle. At the experiment we compensated the earth's magnetic fields and showed a good result driving an autonomous vehicle using proposed method.

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Fabrication and Characterization of an optical oxygen gas sensor formed on the planar optical waveguide prepared by ion exchang method (이온 교환법으로 제조된 평판형 광도파로의 산소광센서의 제작 및 특성평가)

  • 정채환;김재성;김원효;이병택;문종하;김진혁
    • Proceedings of the Optical Society of Korea Conference
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    • 2002.07a
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    • pp.178-179
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    • 2002
  • 최근에 화학, 임상병리, 환경 감시 등의 분야에서 산소센서의 수요가 점차 증가하고 있다. 이러한 산소 센서 중에 가장 많이 쓰이는 방식은 산화물 전극을 사용하는 amperometric 방법이지만 이 방법들은 장기간에 걸쳐 볼 때 산화물 전극의 오염, 외부 자기장의 간섭 등의 제점 때문에 산소를 측정하는데 많은 어려움이 있다. (1) 따라서 최근에는 빛과 유기염료를 통하여 산소의 농도가 증가할수록 세기가 quenching이 되는 원리를 이용한 산소센서의 연구가 이루어졌다. (중략)

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Annealing Effects of Amorphous Cores for the Application of Flux-gate Sensors (Flux-gate 센서용 비정질 코아의 열처리효과)

  • 김용준;손대락;손동환
    • Journal of the Korean Magnetics Society
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    • v.11 no.3
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    • pp.134-140
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    • 2001
  • Flux-gate magnetometer was developed in 1930's, and it has been widely used for the low magnetic field measurements. In this work, we have employed amorphous ribbon 2714A produced by Allied Chem. Co. as sensor core material. To develop low noise, low power consumption, and high reliability flux-gate magnetometer, we have measured ac magnetic properties depending on the annealing conditions. As quenched state amorphous core shows high noise level and ac magnetic properties were changed under the condition of accelerated aging test, but amorphous ribbon, which was annealed under 350 $\^{C}$ during 1 hour, shows low noise level of 0.1 nT in the frequency range of dc∼10 Hz which was 10 times better than the as quenched amorphous ribbon. Under accelerated aging test, ac magnetic properties such as squareness and coercivity of the annealed samples show higher reliability and approached to a certain limiting value as exponential function. We can see that high reliability and low noise flux-gate magnetometer could be developed, if we consider this ac magnetic properties change in the sensor design.

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자기장을 이용한 비접촉 토크센서설계

  • Song, Zeng-Lu;Cho, Chong-Du;Pan, Qiang;Kim, Jae-Min;Kim, Woong-Ji
    • Proceedings of the KSME Conference
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    • 2007.05a
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    • pp.1087-1090
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    • 2007
  • A wireless magnetic torque sensor is utilized to measure the torque generated in the rotating shaft in magnetic field without connecting to the shaft by any wire. In this study, a new wireless magnetic torque sensor was introduced. The structure of the sensor was explained detailed as well as its operation principle. Resulting from the torque measurement experiment results, the sensor was proven to measure the generated torque effectively. Compared with traditional contact torque sensor, the wireless one has low cost and good environment adaptation ability. Moreover, the intractable wrapping wires around the shaft are removed in this design. Hence the wireless torque sensor may be expected as a possible sensing device for many applications, such as the electric assisting rotation system in automobiles, the torque sensing system in motors, the arm rotation system in robotics and so on.

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Topology Optimization of a Bias Magnetic Field for the Performance Improvement of a Magnetostrictive Sensor (마그네토스트릭션 센서 성능 향상을 위한 바이어스 자기장의 위상 최적설계)

  • Cho, Seung-Hyun;Kim, Youngkyu;Kim, Yoon-Young
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2002.05a
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    • pp.554-558
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    • 2002
  • A magnetostrictive sensor is used to measure stress waves propagating in a ferromagnetic cylinder without physical contact. The performance of a magnetostrictive sensor is affected most significantly by the bias magnetic field applied around the measurement location. The goal of this paper is to carry out the topology optimization of the bias magnet and yoke assembly to maximize the sensor output for traveling bending waves. We will use the multi-resolution topology optimization strategy to find the assembly of the bias magnet and the yoke that is easy to realize. The effectiveness of the present design is confirmed by an actual measurement of the sensor signal with the proposed bias magnet and yoke configuration.

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Remote gas meter-reading system using magnetic sensor (자계 센서를 이용한 원격 가스 검침 시스템)

  • Koo, JaYl
    • Journal of the Institute of Electronics Engineers of Korea TE
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    • v.39 no.2
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    • pp.90-94
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    • 2002
  • This paper is related to remote meter-reading using magnetic sensor. Scan system which is developed recently has week point of temperature, humidity, dust, oscillation To solve these problems, this study used magnetic action to measure the consumption of gas. Gas consumption was detected by interaction of a permanent magnet and hall element. Permanent magnet was pasted on rolling change-gear in normal gas meter and hall sensor was pasted on the external wall of normal gas meter. This experiment proved high accuracy and wasn't influenced by temperature, humidity, oscillation and dust