The use of (double) relaxation oscillation SQUIDs as a sensor


Duuren, M.J. van and Brons, G.C.S. and Kattouw, H. and Flokstra, J. and Rogalla, H. (1997) The use of (double) relaxation oscillation SQUIDs as a sensor. IEEE Transactions on Applied Superconductivity, 7 (2). pp. 3469-3472. ISSN 1051-8223

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Abstract:Relaxation Oscillation SQUIDs (ROSs) and Double Relaxation Oscillation SQUIDs (DROSs) are based on relaxation oscillations that are induced in hysteretic dc SQUIDs by an external L-R shunt. The relaxation frequency of a ROS varies with the applied flux Φ, whereas the output of a DROS is a dc voltage, with a typical flux-to-voltage transfer of ∂V/∂Φ≈1 mV/Φ0. The flux-to-frequency response of several ROSs has been measured and compared with theory for frequencies up to 7 GHz. Various DROS designs-a multi-loop direct coupling DROS, a DROS with a washer type signal SQUID and a DROS with gradiometric signal SQUID-will be discussed in this paper. The integration of a DROS with a digital flux locked loop (“Smart DROS”) will also be analyzed
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Copyright:©1997 IEEE
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