• Title, Summary, Keyword: 플럭스게이트

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DC Bias Current Influence to the Sensitivity of Orthogonal Fluxgate Sensor Fabricated with NiZn Ferrite Core (NiZn 페라이트코어를 이용하여 제작한 직교형 플럭스게이트 센서의 출력에 미치는 바이어스전류의 영향)

  • Shin, Kwang-Ho
    • Journal of the Korean Magnetics Society
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    • v.23 no.3
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    • pp.94-97
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    • 2013
  • Orthogonal fluxgate sensor was fabricated with cylinder-shaped NiZn ferrite core, Cu wire through the core and pickup coil wound on the core, and the bias current effect on the output sensitivity of it was investigated. The output ($$\sim_\sim$$ sensitivity) of the sensor was largely dependent on the operation frequency, and the tendency of sensor output was similar to that of the impedance of pickup coil. The maximum output was obtained by adding the DC bias current of which value was over 50% of the excitation current. The output was saturated when the DC bias current was larger than 50% of the excitation current.

Operation Frequency Dependence of Output of Orthogonal Fluxgate Sensor Fabricated with Ferrite Core (페라이트 코어를 이용하여 제작한 직교형 플럭스게이트 센서의 감도에 미치는 구동주파수의 영향)

  • Shin, Kwang-Ho
    • Journal of the Korean Magnetics Society
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    • v.22 no.6
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    • pp.200-203
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    • 2012
  • In this study, we have investigated that the operation frequency dependences of the output properties of the orthogonal fluxgate sensor which was fabricated with a ferrite core. An orthogonal fluxgate sensor should be operated in as high as possible frequency to enhance its sensitivity in the case of small sized sensor, because sensitivity of the sensor is proportional to cross section area, winding number and operation frequency. In this study, we investigated the correspondence of the frequency dependence of output and the reactance (inductance and capacitance) of pickup coil and cable. Experimental results represented that we could obtain maximum output (= sensitivity) at optimal frequency which is near LC resonance frequency of the pickup coil and cable.

Construction of Feed-back Type Flux-gate Magnetometer (피드백형 플럭스게이트 마그네토미터 제작)

  • Son, De-Rac
    • Journal of the Korean Magnetics Society
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    • v.22 no.2
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    • pp.45-48
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    • 2012
  • Feed-back type 3-axis flux-gate magnetometer using Co-based amorphous ribbon (Metglass$^{(R)}$2714A) was constructed in this work. Measuring range of magnetic field and frequency were ${\pm}100\;{\mu}T$ and dc~10 Hz respectively. For the interface to computer, microcontroller and 24 bit ADC (Analog to Digital Converter) were employed and resolution of digital output was 0.1 nT. Magnetometer noise of analog output was 5 pT/$\sqrt{Hz}$ at 1 Hz. Digital output of the magnetometer showed linearity of $1{\times}10^{-4}$ and the offset drift was smaller than 0.2 nT during 1 h.

Construction of a Fluxgate Magnetometer for the Measurment of Magnetic Field Difference (자기장 차이 측정용 플럭스게이트 마그네토미터 제작)

  • Choi, K.W.;Son, D.;Cho, Y.
    • Journal of the Korean Magnetics Society
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    • v.5 no.4
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    • pp.304-308
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    • 1995
  • In order to measure magnetic field difference, we have constructed a fluxgate magnetometer which is based on the measurement of apparent coreci ve field strength from the magnetizing current of two sensors. 'Co-based amorphous ribbon, which has square shape of ac hysteresis loop, was used as core material. Two sensors have 315 turns of the primary and the secondary windings respectively, and core size of 2 mm wide and 30 mm long. The primary windings are connected parallel to measure external magnetic field difference and the secondary windings serieally for the averaged magnetic induction of the cores. The constructed magnetometer could measure magnetic field difference with sensitivity of $1.6{\times}10^{6}V/T$ and resolution of 1 nT at 1 Hz bandwidth.

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Influences of Operation Frequency and Excitation Current on Output Signal of Orthogonal Fluxgate Sensor Fabricated with an Amorphous Wire (아몰퍼스와이어를 이용하여 제작한 직교 플럭스게이트 센서의 출력에 미치는 구동 주파수와 여자 전류의 영향)

  • Shin, Kwang-Ho
    • Journal of the Korean Magnetics Society
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    • v.19 no.1
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    • pp.17-21
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    • 2009
  • In this study, we have investigated that the excitation current and operation frequency dependences of the output properties of the orthogonal fluxgate sensor which was fabricated with a Co base amorphous wire and a pick-up coil. The output signal increased linearly with increase of the excitation current below 0.3 A, and decreased with increase of the excitation current over 0.6 A. It was also found that the output increased sensitively with increase of operation frequency below 1.3MHz. The output was 3.8 V at the frequency of 1.3MHz while 1.32 V at 1MHz.

Design and Realization of Phase Sensitive Detector Circuitry of Two-Channel Ring-Core Flux-Gate Compass (2-체널 링-코어 플럭스-게이트 콤파스의 위상검출 회로 설계와 구현에 관한 연구)

  • Yim, Jeong-Bin
    • Journal of Navigation and Port Research
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    • v.26 no.1
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    • pp.127-136
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    • 2002
  • This paper Presents a discussion on the design and realization for the Phase Sensitive Defector (PSD) circuitry of Flu$\chi$-gate Compass that gives direction information to the Directional Frequency Analysis and Recording (DIFAR) Sonobuoy in Air Anti-Submarine Warfare. PSD circuitry is realized with Twin-T RC networked active band-pass filter. Results of a performance test the PSD circuitry shows that the effectiveness of band-pass filtering of desired $2F_0$ second harmonic signal, which is Pro- portional to the direction of earth's magnetic field. This resulted in the extraction of direction information.

A Development of Fluxgate Sensor-based Drone Magnetic Exploration System (플럭스게이트 센서 기반 드론 자력탐사 시스템 개발)

  • Noh, Myounggun;Lee, Seulki;Lee, Heuisoon;Ahn, Taegyu
    • Geophysics and Geophysical Exploration
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    • v.23 no.3
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    • pp.208-214
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    • 2020
  • In this study, we have developed a drone magnetic exploration system (proto-type) using a fluxgate magnetic sensor. Hardware of the system consists of a fluxgate magnetometer, an inertial measurement unit (IMU), a GPS, and a communication module. And we have developed monitoring software, which enables it to transmit the measured data to the ground control system (GCS) in real time. The measured magnetic data are finally saved as 1 Hz data after passing through a notch filter and a band-pass filter. For verification of this system, a preliminary test was conducted to check the magnetic responses of a magnetic object first, then the field test was carried out in two iron mines. We tested the developed system on the field test in Pocheon, Gyeonggi and Jeongseon, Gangwon. The magnetic data from the developed drone system was very similar to those from unmanned airship system developed by Korea Institute of Geoscience and Mineral Resources (KIGAM). As a result, preliminary experiment and field test have demonstrated that this system is applicable for outdoor aeromagnetic exploration. It requires more studies to improve filter function and instrument performance to minimize noise in the future.