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Development of Digital FLL System for SQUID Using Double Counter Method

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4 Author(s)
D. Oyama ; Fac. of Eng., Iwate Univ. ; K. Kobayashi ; M. Yoshizawa ; Y. Uchikawa

We have developed a digitally controlled flux-locked loop (FLL) system using a double-counter method to achieve both high performance and low cost. This system is composed of generally used electric devices. The system slew rate is about 1.3 k Phi0/s, where Phi0 is the flux quantum. The measurable flux amplitude and dynamic range are 218 Phi0 and 141 dB at 1 Hz and 22 Phi 0 and 121 dB at 10 Hz, respectively. A white noise level measured in the magnetically shielded room (MSR) is 36.1 fT/Hz1/2 . Magnetic measurements with a first-order gradiometer were done outside the MSR, and the developed system can detect a magnetocardiogram in an unshielded condition

Published in:

IEEE Transactions on Magnetics  (Volume:42 ,  Issue: 10 )