Multi-channel magnetic flux detector comprising a magnetometer m

Details Multi-channel magnetic flux detector comprising a magnetometer m Multi-channel magnetic flux detector comprising a magnetometer m

1991-12-13

1993-09-07

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Magnetometers

324262, 505846, 1286531, G01R 33035

Patent

active

052432815

ABSTRACT:
A superconducting device for measuring weak magnetic fields, especially those generated by the human brain and detected simultaneously over the whole skull. The superconducting magnetometer or gradiometer elements of the device are attached with connectors to a cross-connection/support element which, in turn, is attached to a connecting element containing the electric components necessary for connecting the SQUIDs to the room temperature electronics. The connecting element is attached to a neck plug for the dewar flask. The neck plug is made of a stiff thermal insulation to prevent convection and a ribbon cable containing parallel twisted pairs. The latter element is self-supporting and forms an integral part of the magnetometer support structure. The cables in the neck plug have been made out of wires having a relatively high resistance in order to minimize the heat leak between room temperature and the cryogenic environment of the magnetometers. The excess noise caused by the resistive leads may be compensated by increasing the SQUID gain using positive feedback.

REFERENCES:
patent: 4613816 (1986-09-01), Zeamer
patent: 4761611 (1988-08-01), Hoenig
patent: 4793355 (1988-12-01), Crum et al.
patent: 4827217 (1989-05-01), Paulson
patent: 4977896 (1990-12-01), Robinson et al.
patent: 5061680 (1991-10-01), Paulson et al.
Clarke, "Squid's brains and gravity waves", Physics Today, Mar. 1986, pp. 36-44.
Angell et al, "Silicon Micromechanical Devices", Scientific American, Apr. 1983, pp. 44-55, vol. 248, No. 4.
R. Hari et al, "Cerebral Magnetic Fields", CRC Critical Reviews in Biomedical Engineering, vol. 14, 1986, pp. 93-126.
T. Ryhanen et al, "SQUID Magnetometers for Low-Frequency Applications", Journal of Low Temperature Physics, vol. 76, Sep. 1989, pp. 287-386.
J. Knuutila et al, "A Large-Area Low-Noise Seven-Channel DC SQUID Magnetometer for Brain Research", Rev of Scien. Instr., vol. 58, Nov. 1987, 2145-2156.
F. Wellstood et al, "Integrated Dc SQUID Magnetometer with a High Slew Rate", Rev. of Scientific Instruments, vol. 55, Jun. 1984, pp. 952-957.
J. Knuutila et al, "Design Considerations for Multichannel SQUID Magnetometes", Supercond. Quant. Inter. Dev. and Their Appln., 1985, pp. 939-944.
D. Drung et al, "Low-Noise High-Speed Dc Superconducting Quantum Interference Device Magnetometer . . . ", Applied Physics Letters, pp. 406-408, Jul. 1990.

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