Abstract
We present an integrated thin-film gradiometric SQUID sensor in technology. The dc-SQUID converter is designed as a parallel inductance double-washer SQUID. It is inductively coupled to a planar parallel inductance gradiometer antenna with 15 mm baseline by two series input coils with eight turns each. The field gradient sensitivity is . The intrinsic field gradient resolution down to 1 Hz is , measured in a shielded environment. The sensor can be operated reliably without any magnetic shielding. Under these conditions the transfer function is decreased by about a factor of three, resulting in a field gradient resolution of in the white noise region. Coherent noise sources produced by a power line and railway were suppressed by means of electronic subtraction using a reference channel and selective filtering. The resolution of the system is demonstrated by MCG measurements without any shielding.
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