Journal of Astronomy and Space Sciences

The Korean Space Science Society (한국우주과학회)
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Performance Test of Search Coil Sensors with Different Core Types

  • Hyeonji Kang (School of Space Research, Kyung Hee University) ;
  • Ho Jin (School of Space Research, Kyung Hee University) ;
  • Yunho Jang (School of Space Research, Kyung Hee University) ;
  • Seungmin Lee (School of Space Research, Kyung Hee University) ;
  • Hyeonhu Park (School of Space Research, Kyung Hee University) ;
  • Juhyeong Kim (School of Space Research, Kyung Hee University) ;
  • Wooin Jo (School of Space Research, Kyung Hee University)
  • Received : 2024.04.17
  • Accepted : 2024.08.05
  • Published : 2024.09.15
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Abstract

A search coil magnetometer (SCM) is a common equipment to observe energy transmission and vibrations in space physics, enabling measurements across a wide frequency range of up to tens of kilohertz. This study proposes the designs of a magnetic core that allows a low-mass sensor and improves its performance: a rod core, sheet-stacked core, and rolling-sheet core. Subsequently, the performance of each sensor was investigated. The sheet-stacked core using the cobalt-based alloy exhibited the highest sensitivity, although it exhibited instability beyond 20 kHz. In contrast, the rod and rolling-sheet core sensors demonstrated stability in the magnetic field measurements (10 Hz-40 kHz). Moreover, the noise equivalent magnetic induction (NEMI) of the rod- and rolling-sheet core sensors were 0.014 pT Hz-1/2 and 0.012 pT Hz-1/2 at 1 kHz, respectively. The rolling-sheet core with high relative permeability achieved a mass reduction of over three times that of the rod core while exhibiting sufficient sensitivity.

Keywords

Acknowledgement

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT), NRF-2022M1A3B8076421.

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