Magnetometer device with a Dewar vessel for measuring weak magne

Details Magnetometer device with a Dewar vessel for measuring weak magne Magnetometer device with a Dewar vessel for measuring weak magne

1989-09-15

1991-02-26

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Magnetometers

128653, 62 491, 220901, G01R 33035, A61B 505, F17C 1302

Patent

active

049964798

ABSTRACT:
A magnetometer device for measuring the magnetic fields caused by field sources includes a Dewar vessel that has an interior with access through a neck. The interior contains several superconducting gradiometers as well as corresponding SQUIDs. The Dewar vessel is arranged underneath or laterally to the field source. An insertion vessel for a liquid refrigerant which is thermally coupled to the SQUIDs and is located in the interior. The gaseous refrigerant taken from the insertion vessel is supplied to the gradiometers through hose lines. The refrigerant escaping into the interior is discharged to the outside via the neck. A throttling device is inserted into the neck to prevent warmer gaseous refrigerant from entering the interior.

REFERENCES:
patent: 4689559 (1987-08-01), Hastings et al.
patent: 4700135 (1987-10-01), Hoenig
patent: 4749946 (1988-06-01), Hoenig
patent: 4793355 (1988-12-01), Crum et al.
patent: 4827217 (1989-05-01), Paulson
Patent Abstracts of Japan, vol. 10, No. 285; Sep. 27, 1986; JP 61-104681, 5/22/86.
Physics Today, Mar. 1986, pp. 36-44; "Squids, Brains and Gravity Waves".
J. Phys. E.: Sci. Instrum., vol. 13 (1980), pp. 801-813.
IEEE Transactions on Electron Devices, vol. ED-27, No. 10 (1980), 1896-1908.
Book "Biomagnetism--Berlin 1980" (1981), pp. 3-31.

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