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Design and Fabrication of Digital 3-axis Magnetometer for Magnetic Signal from Warship

함정 자기신호 측정용 3-축 디지털 자기센서 설계 및 제작에 관한 연구

  • Kim, Eunae (Dept. of Photonics and Sensors, Hannam University) ;
  • Son, Derac (Dept. of Photonics and Sensors, Hannam University)
  • 김은애 (한남대학교 광센서공학과) ;
  • 손대락 (한남대학교 광센서공학과)
  • Received : 2014.07.26
  • Accepted : 2014.08.18
  • Published : 2014.08.31

Abstract

We developed a digital 3-axis flux-gate magnetometer for magnetic field signal measurement from warship during demagnetizing and degaussing processes. For the magnetometer design, we considered following points; the distance between magnetic field measurement station and magnetometer located under sea is about several 100 m, the magnetometer is exposed to magnetic field of ${\pm}1mT$ during demagnetizing process, and magnetometer is located under the sea about 30 m depth. To overcome long distance problem, magnetometer could be operated on wide input supply voltage range of 16~36 V using DC/DC converter, and for the data communication between the magnetometer and measurement station a RS422 serial interface was employed. To improve perming effect due to the ${\pm}1mT$ during demagnetizing process, magnetometer could be compensated external magnetic field up to ${\pm}1mT$ but magnetic field measuring rang is only ${\pm}100{\mu}T$. The perming effect was about ${\pm}2nT$ under ${\pm}1mT$ external magnetic field. The magnetometer was tested water vessel with air pressure up to 6 bar for the sea water pressure problems. Linearity of the magnetometer was better than 0.01 % in the measuring range of ${\pm}0.1mT$ and noise level was $30pT/\sqrt{Hz}$ at 1 Hz.

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