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Magnetic field fluctuations in our unshielded urban laboratory can reach hundreds of nT in the noisy daytime and is only a few nT in the quiet midnight. The field fluctuation causes the Larmor frequency fL to drift randomly for several Hz during the unshielded ultra-low field (ULF) nuclear magnetic resonance (NMR) and magnetic resonance imaging (MRI) measurements, thus seriously spoiling the averaging...
A low noise superconducting quantum interference device (SQUID) readout scheme is developed to detect the small magnetic field signal at frequency up to MHz. It consists of a low noise small signal amplifier and a direct-coupled flux-locked loop. The flux-locked loop keeps the working point stable by cancelling the low frequency flux interference from environment. Around the working point with the...
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