• Title/Summary/Keyword: Eddy Current Sensor

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Joint tracking system for butt joint welding process using eddy current sensors with the condition of no gap distance (자기장 센서를 이용한 갭간격이 없는 박판 맞대기 용접부의 용접선 추적 장치)

  • 김영선;조형석
    • 제어로봇시스템학회:학술대회논문집
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    • 1997.10a
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    • pp.836-839
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    • 1997
  • In recent years, much progress has been made in the automation of welding coped with a variety of highly flexible sensors. Among these sensors, only the eddy current sensor can detect the center location of the butt joint whose gap distance is zero. Thus, in this study the eddy current sensor is used to develop a robust and useful joint tracking system. The developed system is tested to qualify the performance of the system and seam tracking algorithm is proposed and two simulation are executed to show the performance of the proposed tracking algorithm.

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Development of Diagnostic Device for Internal Degradation in Distribution Line Using NDT Mathod (NDT 기법을 이용한 가공배전선로 내부 열화 진단장치 개발)

  • Hyun, Deuk-Chang
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.28 no.8
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    • pp.539-543
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    • 2015
  • At present, the development of a detection device in order to prevent accidents due to wire deterioration in the distribution lines is required. Distribution line is not possible to check the internal state in a normal way because it is covered with the coating. Accordingly, various eddy current techniques that is the non-destructive test (NDT) techniques have been applied to solve this problem. In this paper, we have seen examining the characteristic change of the eddy current sensor according to the simplified shape of the sensor in order to solve the problems for the simplified shape that is generated when the simulation for the shape of the eddy current sensor.

Application of eddy current technique for the non-contact sensing of low concentration of electrolytic solution

  • Ismail, Abu Bakar Md.;Shida, Katsunor
    • 제어로봇시스템학회:학술대회논문집
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    • 1997.10a
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    • pp.1310-1313
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    • 1997
  • Application of eddy current sensing principle for the non-contact estimation of very low concentration of electrolytic solution is presented in this paper. for this application, a new, simple, low-cost, low-power structure for the eddy current sensor is proposed. By measuring the eddy current produced in the conducting electrolytic solution, the concentration is estimated. Therefore, the unknown concentration can be estimated comparing with the database which is prepared as the relation between the change in inductance and various concentrations of electrolytic solution. The concentration, as low as l ppm of the solutioin can be detected by this sensor. It was tested on various low concentration solutions of NaCl. It shows distinct response for various concentrations.

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An Experimental Study of Nondestructive Testing System to measure Dimension of Cylindrical Rod using Solenoid Eddy Current Coil

  • Kim, Sung-Duck
    • Journal of Sensor Science and Technology
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    • v.7 no.3
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    • pp.203-210
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    • 1998
  • An experimental study of an eddy current nondestructive testing system to measure dimensions of cylindrical metallic rods, such as cross-sectional area or diameter, is presented. Impedance characteristics of a solenoid sensor, which are generally based on Maxwell's equations in electromagnetic field, are briefly discussed for inspecting geometrical parameters of the coil sensor and testing materials. A measurement system for detecting the diameter of the metallic rod is implemented. This instrument has capabilities for detecting the sensor output signals and estimating demensions of the testing material, continuously. As a result, it was shown that the eddy current sensor with an encircling coil could estimate the diameter of metallic rod. The implemented measurement system gives accurate information for inspecting the dimension of conducting rod with good sensitivity.

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A Magnetic Circuit Model of Inductive Sensor Considering Eddy Currents and Hysteresis (와전류와 히스테리시스를 고려한 유도형 변위 센서의 자기회로 모델 개발)

  • 노명규;정민경;박병철
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2002.05a
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    • pp.267-270
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    • 2002
  • The accuracy and the dynamic bandwidth are the two most important indices that an inductive position sensor is evaluated with. Eddy currents and magnetic hysteresis affect both of these performance indices. As the modulation frequency of the sensor increases to improve the dynamic bandwidth, the effects of eddy currents and hysteresis also increases, which results in the loss of accuracy. In this paper, a magnetic circuit model of the differential inductive sensor is developed. This model includes the effects of hysteresis and eddy currents. Experimental results confirm the validity of the model. The model predicts that the eddy current effects are not significant below the modulation frequency of 50kHz, as long as the lamination thickness is adequate.

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A Development of Eddy Current Sensor System for An Axial-flow type Blood Pump with The Magnetic Bearing (축류형 인공심장의 자기베어링 제어를 위한 와전류 센서 시스템 개발)

  • Ahn, C.B.;Moon, K.C.;Jeong, G.S.;Nam, K.W.;Lee, J.J.;Sun, K.
    • Journal of Biomedical Engineering Research
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    • v.28 no.2
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    • pp.310-315
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    • 2007
  • The axial-flow type blood pump(XVAD) which has been developed in our group consists of mechanical parts (an impeller, a diffuser and a flow straightener) and electrical parts (a motor and a magnetic bearing). The magnetic bearing system fully levitates the impeller to remove mechanical coupling with other parts of the pump with constant gap, which needs non-contact type gap sensing. Conventional gap sensors are too large to be adopted to the implantable axial -flow type blood pump. Thus, in this paper, the compact eddy current type gap sensor system proper for the implantable axial-flow type blood pump was developed and its performance was evaluated in vitro. The developed eddy current type gap sensor system is a transformer type and has a differential probe. Sensor coil(probe) has small dimensions(6 mm diameter, 2 mm thickness) and its optimal inductance was determined as 0.068 mH for the measurement range of $0\sim3mm$. It could be manufactured with 130 turns of the 0.04 mm diameter copper coil. The characteristics of the developed eddy current type gap sensor system was evaluated by in vitro experiment. At experiment, it showed satis(actory performance to apply to the magnetic bearing system of the XVAD. It could measure the gap up to 3mm, but the linearity was decreased at the range of $1.8\sim3.0mm$. Moreover, it showed no difference in different media such as the water and the blood at the temperature range of $35\sim40^{\circ}C$.

Measurement Feasibility Assessment of Coating Film Thickness using Dual Sensor (이중센서를 이용한 코팅막 두께 측정 가능성 평가)

  • 김주현;김성렬;김정욱;김화영;안중환
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2004.10a
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    • pp.78-81
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    • 2004
  • A technical performance of the coating depends greatly on the thickness of painting film or coating film. Therefore the confirmed report of the technique to measure accurately is essential to the coating film thickness for the assessment about a coating quality performance. In this paper, two gap sensors - eddy current gap sensor and capacitance gap sensor - which has a different operating principle were used to measure the thickness of a nonmagnetic substance coating film such as paint, enamel or ceramic that was coated on the metallic material. A capacitance gap sensor was used to measure the distance between the sensor head and a coating film and an eddy current gap sensor to measure the distance between the sensor head and a base metal. Then the thickness of a coating film was obtained by the difference of two measurement value. At this result, the suggested dual sensor can measure an arbitrary film thickness to be coated on a base metal as the measurement value of coating thickness exists accurately within the 2% error.

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