Patent ID: 8174259
Filing Date: 2012-05-08
Classification: G01R

Abstract:
1. An apparatus for determining magnetic properties of materials, comprising: a remote superconducting quantum interference device (SQUID) located within a cryostat; means for applying an alternating magnetic field to a sensing region containing a material; means for sensing a change in a magnetic parameter of the material resulting from the applied alternating magnetic field and for generating a sensor output signal in response thereto; means for conveying the sensor output signal to the remote SQUID which is located remotely from the means for sensing a change in a magnetic parameter of the material; and means for receiving an output signal from the remote SQUID indicative of a sensed magnetization, wherein the means for sensing a change in a magnetic parameter of the material is not located within the cryostat, and wherein the sensing means comprises a sensor coil and the sensor coil comprises a central region containing substantially one half of the total number of turns of the coil and two side regions each containing substantially one quarter of the number of turns of the coil and wound in opposition to the turns of the central region.