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| Development of Micro-size Search Coil Magnetometer for Magnetic Field Distribution Measurement |
| Journal of Magnetics, Volume 13, Number 1, 31 Mar 2008, Pages 34-36 |
E.M. Ka(Department of Physics, Hannam University), De-Rac Son*  (Department of Physics, Hannam University) |
| Abstract |
| For the measurement of the magnetic field distribution with high spatial resolution and high accuracy, the magnetic field sensing probe must be non-magnetic, but the MFM probe and sub-millimeter-meter size Hall probe use a ferromagnetic tip and block, respectively, to increase the sensitivity. To overcome this drawback, we developed a micro-size search coil magnetometer which consists of a single turn search coil, Terfenol-D actuator, scanning system, and control software. To reduce the noise generated by the stray ac magnetic field of the actuator driving coil, we employed an even function λ-H magnetostriction curve and lock-in technique. Using the developed magnetometer, we were able to measure the magnetic field distribution with a magnetic field resolution of 1 mT and spatial resolution of 0.1mm×0.2mm at a coil vibration frequency of 1.8 kHz. |
| Keywords: search coil magnetometer; magnetic field measurement; magnetic field distribution; Terfenol-D actuator |
| DOI: 10.4283/JMAG.2008.13.1.34 |
| Full Text: PDF |
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