• Title, Summary, Keyword: magnetometer

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Construction of HTS multi-channel SQUID system

  • Park, W.K.;Lee, H.J.;Moon, S.H.;Lim, S.H.;Kim, D.Y.;Oh, B.;Lee, S.M.
    • 한국초전도학회:학술대회논문집
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    • v.10
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    • pp.169-172
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    • 2000
  • We have constructed a multi-channel SQUID magnetometer system. The system is designed to operate normally with 10 high temperature direct coupled SQUIDs. The main features of the system include a remote control by serial communication, low noise with wide bandwidth and high slew rate by several MHz modulation, signal conditioning and calibration by digital signal processing.

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Construction of HTS Multi-channel SQUID System

  • Lee, S.M.;Park, W.K.;Lee, H.J.;Moon, S.H.;Lim, S.H.;Kim, D.Y.;Oh, B.
    • Progress in Superconductivity
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    • v.2 no.1
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    • pp.47-50
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    • 2000
  • We have constructed a multi-channel SQUID magnetometer system. The system is designed to operate normally with 10 high temperature direct coupled SQUIDs. The main features of the system include a remote control by serial communication, low noise with wide bandwidth and high slew rate by several MHz modulation, signal conditioning and calibration by digital signal processing.

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Magnetic Field Correction Method of Magnetometers in Small Satellites

  • Lee, Seon-Ho;Rhee, Seung-Wu;Ahn, Hyo-Sung
    • 제어로봇시스템학회:학술대회논문집
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    • pp.36-40
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    • 2003
  • The considered satellite is supposed to operate in the earth-point mode and sun-point mode in accordance with the mission requirements. The magnetic field correction is based on the orbit geometry using a set of measured magnetic field data from the three-axis-magnetometer and its algorithm excludes the earth’s magnetic field model. Moreover, the usefulness of the proposed method is investigated throughout the simulation of KOMPSAT-1.

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A Study of Spatial Model for AMR Magnetometer In Wireless Sensor Network (센서네트워크 응용을 위한 AMR 자기센서의 공간적 출력 신호 모델링 연구)

  • Kim, Ki-Tae;Kim, Keon-Wook
    • Proceedings of the IEEK Conference
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    • pp.953-954
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    • 2008
  • Wireless Sensor Network (WSN) surveillance applications usually employed magnetometer for recognizing the ferrous objects. Novel magnetic sensing model which includes azimuth parameter is suggested to understand the anisotropic characteristic of magnetic field through numerous outdoor experiments.

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A Study on Properties of Magnetic Field for Development of the Coil Type Magnetometer (코일형 자계 측정기 개발을 위한 자계 특성에 관한 연구)

  • Park, Geon-Ho
    • Proceedings of the Korean Society of Computer Information Conference
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    • pp.133-134
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    • 2017
  • 전선으로부터 발생되는 저주파 자장을 검출할 수 있고 휴대성 및 가격 경쟁력이 있는 코일형 자계 측정기를 개발하기 위해 본 연구에서 제시된 전선용 자계 검출 센서는 자기 코어 및 코일 권선수 및 길이의 변화에 따른 자계 검출 감도를 분석하여 활선 상태 및 자계의 세기를 확인하여 최적화 구조를 설정하였다.

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Low Temperature Magnetization and Spin Wave Excitations in Amorphous Fe67 Co18B14Si1

  • Yoo, Yong-Goo;Yu, Seong-Cho;Hans A. Graf
    • Journal of Magnetics
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    • v.2 no.3
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    • pp.72-75
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    • 1997
  • The temperature dependent saturation magnetization curve of amorphous Fe67 Co18B14Si1, alloy was measured using a SQUID magnetometer and vibrating sample magnetometer from 5 K up to 800 K. Inelastic neutron neutron scattering measurements also have been used to study the long wavelength spin dynamics of this high Tc amorphous ferromagnetic alloy. The magnon dispersion curve exhibit the conventional quadratic relationship E = D (T) q2 + $\Delta$, typical of an iso=obtained from a low temperature magnetization curve, which was consistent with the value obtained from the analysis oif inelastic neutron scattering data after consideration of its temperature dependence.

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Measurements of Local Coercivity Distribution in Ferromagnetic Films Using Magneto-Optical Microscope Magnetometer (MOMM)

  • Choe, Sug-Bong;Shin, Sung-Chul
    • Journal of Magnetics
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    • v.5 no.3
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    • pp.81-84
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    • 2000
  • A magneto-optical microscope magnetometer (MOMM) has been developed to simultaneously measure 2-dimensional array hysteresis loops of each local area of $320\times320-nm^2$ spots on ferromagnetic films, in addition to grabbing time-resolved domain evolution patterns. Using the system, spatial distribution of local coercivity can be quantitatively generated and then, compared directly with domain patterns grabbed at precisely the same position of a sample. It is clearly demonstrated that local coercivity distribution governs domain reversal behavior via a thermally activated relaxation process.

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Fabrication and Characteristics of Superconducting Magnetometer

  • Lee, Sang-Heon
    • Transactions on Electrical and Electronic Materials
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    • v.6 no.2
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    • pp.70-72
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    • 2005
  • The relation between electrical properties of YBaCuO ceramic superconductor and externally applied magnetic field was studied. Electrical characteristics of the superconductor with trapped magnetic fluxes are extremely sensitive to the external magnetic field and show the different responses which depend on the direction of the magnetic field. Considering these properties of the superconductor with trapped magnetic fluxes, a magnetic sensor is fabricated. This sensor is able to detect simultaneously both the intensity and the direction of the magnetic field. The sensitivity of the sensor is less than 10$^{-4} T.

Magnetic Properties of the $Y_{1}Ba_{2}Cu_{3-x}Sn_{x}O_{7-y}$ $High-T_{C}$ Superconductor (고온 초전도체 $Y_{1}Ba_{2}Cu_{3-x}Sn_{x}O_{7-y}$의 자기적 특성 연구)

  • 이성규;이주일;김문석;유성초;임우영;백종성
    • Journal of the Korean Magnetics Society
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    • v.1 no.2
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    • pp.15-21
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    • 1991
  • The magnetic properties of the $Y_{1}Ba_{2}Cu_{3-x}Sn_{x}O_{7-y}$ superconductor were studied as a function of Sn concentration by utilizing both the vibrating sample magnetometer (VSM) and torque magnetometer. Unlike the cases where Fe and Co were substituted for Cu, the superconducting transition temperature was maintained above 90 K until x reached the value of 0.36. The lower critical field $H_{c1}(T)$ and upper critical field $H_{c2}(T)$ are measured as a function of temperature and external magnetic field, respectively. By aid of these results, $H_{c1}(0)$.($H_{c2}(0)$), the coherence length ${\varepsilon}_{0}$, the penetration depth ${\lambda}_{0}$, and the Ginzburg-Landau parameter k were oqtained. Flux pinning was also observed in the sample.

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