Abstract
Dept. of Photonics and Sensors, Hannam University, Daejeon 306-791, Korea(Received 26 July 2014, Received in final form 18 August 2014, Accepted 18 August 2014)We developed a digital 3-axis flux-gate magnetometer for magnetic field signal measurement from warship during demagnetizingand degaussing processes. For the magnetometer design, we considered following points; the distance between magnetic fieldmeasurement station and magnetometer located under sea is about several 100 m, the magnetometer is exposed to magnetic field of± 1 mT during demagnetizing process, and magnetometer is located under the sea about 30 m depth. To overcome long distanceproblem, magnetometer could be operated on wide input supply voltage range of 16~36 V using DC/DC converter, and for the datacommunication between the magnetometer and measurement station a RS422 serial interface was employed. To improve permingeffect due to the ± 1 mT during demagnetizing process, magnetometer could be compensated external magnetic field up to ± 1 mT butmagnetic field measuring rang is only ± 100µT. The perming effect was about ± 2 nT under ± 1 mT external magnetic field. Themagnetometer was tested water vessel with air pressure up to 6 bar for the sea water pressure problems. Linearity of the magnetometerwas better than 0.01 % in the measuring range of ± 0.1 mT and noise level was 30 pT/ at 1 Hz.Keywords: Magnetometer, flux-gate magnetometer, low magnetic field, perming, amorphous core
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