Low noise cryogenic apparatus for making magnetic measurements

Electricity: measuring and testing – Magnetic – Magnetometers

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128653, 324201, 324225, 335216, G01R 33035, G01R 3316, A61B 505, G01N 2772

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active

048272175

ABSTRACT:
Apparatus for performing sensitive magnetic measurements using cryogenically cooled instrumentation, wherein the instrumentation is separated from the bubbles present in a cryogenic cooling fluid. In one embodiment, the magnetic measurement instrumentation is placed in a tail piece joined by heat conducting bolts to a dewar containing a cryogenic fluid, and heat from the instrumentation is conducted to the cryogenic fluid heat sink by metallic strips reaching to the bolts. The cryogenic fluid does not contact the instrumentation directly, resulting in a significantly reduced level of noise in the instrumentation. The tail piece may also be evacuated to avoid pressure and temperature variations that may cause noise and affect the magnetic instrumentation.

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