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AssigneeHypres, Inc.
InventorsVictor K. Kornev, Igor I. Soloviev, Nikolai V. Klenov, Oleg A. Mukhanov
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A superconducting quantum interference devices (SQUID) comprises a superconducting inductive loop with at least two Josephson junction, whereby a magnetic flux coupled into the inductive loop produces a modulated response up through radio frequencies. Series and parallel arrays of SQUIDs can increase the dynamic range, output, and linearity, while maintaining bandwidth. Several approaches to achieving a linear triangle-wave transfer function are presented, including harmonic superposition of SQUID cells, differential serial arrays with magnetic frustration, and a novel bi-SQUID cell comprised of a nonlinear Josephson inductance shunting the linear coupling inductance. Total harmonic distortion of less than −120 dB can be achieved in optimum cases.
A superconducting detector for a magnetic field, adapted to provide a linear detector output over a range of an applied magnetic field, comprising:
A method for linearizing an output of a superconducting detector for a magnetic field, adapted to provide a detector output, comprising a superconducting quantum interference device (SQUID) having a SQUID output which has a response pattern which is periodic and substantially non-linear with respect to variations of magnetic flux, the magnetic flux being a function of magnetic field, comprising compensating the SQUID output with at least one superconducting element having a nonlinear impedance, wherein the SQUID and the at least one superconducting element are appropriately configured and operated under such conditions to thereby linearize at least a portion of a quarter of a period of the periodic and substantially non-linear response of the SQUID output, to produce the detector output which is a substantially linear function of the magnetic field.
A magnetic field detector array, comprising a plurality of superconducting quantum interference devices and a common output, each having an intrinsic response which is periodic and non-linear with respect to magnetic flux, the magnetic flux being a function of a magnetic field, the plurality of superconducting quantum interference devices each having a respective effective cell area, the respective effective cell areas of the plurality of superconducting quantum interference devices being non-uniformly distributed, the array being appropriately configured such that the each of the plurality of superconducting quantum interference devices provides a contribution to the common output, and wherein the common output is substantially linear with respect to changes in magnetic field over a range of magnetic fields outside of a null field, for which no one of the plurality of superconducting quantum interference devices is substantially linear.
Dependencies are inferred from the claim text.