Magnetic Sensor with Combined High Pass Flux Concentrator and Flux Biasing Circuit

摘要

A superconducting quantum interference device (SQUID) for mobile applications comprising: a superconducting flux transformer having a pickup coil and an input coil, wherein the input coil is inductively coupled to a Josephson junction; a resistive element connected in series between the pickup coil and the input coil so as to function as a high pass filter such that direct current (DC) bias current is prevented from flowing through the input coil; and a flux bias circuit electrically connected in parallel to the superconducting flux transformer between the pickup coil and the input coil so as to reduce motion-induced noise.