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Magnetometer device with a Dewar vessel for measuring weak magnetic fields

  • US 4,996,479 A
  • Filed: 09/15/1989
  • Issued: 02/26/1991
  • Est. Priority Date: 09/16/1988
  • Status: Expired due to Fees
First Claim
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1. A magnetometer device for measuring weak magnetic fields, of at least one field source comprising:

  • a Dewar vessel arranged below or laterally to the at least one field source and having an interior region and a neck, said interior region being accessed via said neck;

    an insertion vessel disposed in the interior region of the Dewar vessel in which liquid refrigerant can be retained;

    a plurality of superconducting gradiometers and associated SQUIDs arranged in the interior region of the Dewar vessel, the SQUIDs being positioned in or at the insertion vessel;

    a pipeline terminating in said insertion vessel and extending through the neck feeding liquid refrigerant through the neck from outside the Dewar vessel;

    at least one hose line extending from the insertion vessel to the superconducting gradiometers feeding gaseous refrigerant to said gradiometers; and

    a throttling device positioned in the neck for inhibiting warmer gaseous refrigerant from flowing back into the interior region, said pipeline extending through said throttling device.

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