• 한국자기학회지
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• 제6권1호
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• pp.36-39
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• 1996

비정질 리본의 자기변형 측정을 위한 Fabry-Perot 간섭계형 광섬유 변위센서를 구성하였고, 헬름홀쯔 코일로써 교류자기장을 인가하여 자기변형을 측정하였다. 구성한 변위 센서의 출력신호는 구성요소인 index matching optical oil과 optical isolator의 사용에 의하여 잡음과 요동을 개선하였다. 구성한 변위센서의 분해능은 $30{\AA}$이었고, 이를 이용하여 1 Hz의 자화 주파수에서 측정한 비정질 $Fe_{81}B_{13.5}Si_{3.5}C_{2}$ 리본의 최대 자기변형 값은 인가자기장 $1.59{\times}10^{3}A/m$에서 $28{\times}10^{-6}$이였다.

• 한국정밀공학회지
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• 제22권8호
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• pp.42-49
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• 2005

Our purpose is to develop a precision magnetic displacement sensor that has sub-micron resolution and small size probe. To achieve this, we first have tried to establish mathematical models of a magnetic sensor in this paper. The inductance model that presents basic measuring principle of a magnetic sensor is based on equivalent magnetic circuit method. Especially we have concentrated on modeling of magnetic flux leakage and magnetic flux fringing. The induced model is verified by experimental results. The model, including the magnetic flux leakage and flux fringing effects, is in good agreement with the experimental data. Subsequently, based on the augmented model, we will design magnetic sensor probe in order to obtain high performances and to scale down the probe.

• 한국정밀공학회지
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• 제22권8호
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• pp.50-56
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• 2005

This paper is described a development of an optical fiber displacement sensor. The optical fiber sensor using an intensity modulated measures the displacement between target and sensor. A prototype sensor is composed of a transmitting part, a receiving part and a signal processing circuit. The experiment was conducted not only the sensor performance but also factors that affect intensity. The main performance of this sensor is resolution of 0.37um and the non-linearity $0.7\%$ FS and the dynamic bandwidth of about 6.3kHz. As a result of rotation test, the prototype sensor showed an equivalent performance to a commercial eddy current sensor.