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US 7,002,341 B2Granted
Superconducting quantum interference apparatus and method for high resolution imaging of samples
AssigneeVanderbilt University
InventorsFranz J. Baudenbacher, Nicholas T. Peters, John P. Wikswo, Jr., Robert L. Fagaly
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Abstract
A method and apparatus performs high resolution imaging. The disclosed apparatus includes a low temperature SQUID sensor mounted in close proximity to a dewar thin window. A radiation shield has an extension surrounding the detection coil.
Claims33
An apparatus for high resolution imaging of a sample, comprising:
- a SQUID evacuated dewar;
- a SQUID sensor cooperating with the dewar to sense magnetic flux from the sample being imaged, the sensor having a detection coil;
- a cold finger;
- the dewar having a thin window;
- means for mounting the sensor remotely from the coil;
- the detection coil being electrically connected to the SQUID sensor;
- a mechanism for mounting the detection coil at the distal end of the cold finger in close proximity to the thin window, the mechanism including a bobbin having a tip;
- a material disposed on the bobbin tip for cooling the detection coil below the transition temperature
- a radiation shield mounted within the dewar and having an extension surrounding the detection coil to help maintain its cold temperature;
- and
- wherein the extension prevents or reduces circular currents in the plane of the detection coil.
8 more elements
A method of high resolution imaging of a sample, comprising:
- sensing magnetic flux from the sample using a SQUID evacuated dewar and a SQUID sensor having a detection coil;
- mounting the SQUID sensor within the dewar remotely of the detection coil;
- mounting the detection coil on a bobbin having a tip at the distal end of a cold finger in close proximity to a thin window forming a part of the dewar;
- placing a material on the bobbin tip for cooling the detection coil below the transition temperature;
- mounting a radiation shield having an extension within the dewar and surrounding the detection coil;
- and
- using the extension to prevent or reduce circular currents in the plane of the detection coil via the extension.
4 more elements
Dependencies are inferred from the claim text.