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Improving the Sensitivity of Superconductor-Based DC Magnetometer |
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| Authors: | Fatma Al?kma Cengiz Birlikseven Gulay Gulmez Enis Turhan Eylem Gulce Coker Ugur Topal |
| Affiliation: | 1. T??B?TAK-UME National Metrology Institute, P.K. 54, 41470, Gebze, Kocaeli, Turkey 2. Physics Department, Marmara University, ?stanbul, Turkey 3. Physics Department, Yeditepe University, ?stanbul, Turkey |
| Abstract: | In this study we report on some critical factors affecting the sensitivity of a magnetic field sensor whose working principle is based on a linear DC field dependence of the second harmonic of the AC response in polycrystalline type-II superconductors. DC-fields down to 2?nT in magnitude could be detected by finding optimal conditions. The optimal sensor design was determined by studying superconductor cores having different geometries and coil configurations. The optimal AC-field frequency, which is required for excitation of the specimen, was found to be 50?kHz. The second harmonic signal changes quite linearly with the DC-field up to 0.1?Oe. |
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