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Measurement of Eddy-Current Noise Induced in Metals Using SQUID Gradiometer

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62

E7

Measurement of Eddy-Current Noise Induced in Metals Using

SQUID Gradiometer

K. K. Yu, Y. H. Lee, K. Kim, J. M. Kim

Korea Research Institute of Standards and Science, Daejeon, Korea

We measured magnetic field noise induced in copper and brass using superconducting quantum interference device gradiometer. The metallic samples are solid blocks, enamel-insulated dense coil-foils with several wire diameters, and manually wound sparse coil winding. The metallic samples were positioned at 10-30 mm from the sensing coil of an axial first-order gradiometer having a baseline of 70 mm. Magnetic field noises were measured with the samples at room temperature and at liquid He temperature. Intrinsic noises of the SQUID gradiometers are around 3-4 fT/sqrt(Hz). Depending on the material type, shape of the sample and distance from the sensing coil, magnitude of noise was different, increasing to the range of 6-30 fT/sqrt(Hz).

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