Integrated-type SQUID magnetometer having a magnetic shield, and

Details Integrated-type SQUID magnetometer having a magnetic shield, and Integrated-type SQUID magnetometer having a magnetic shield, and

1990-05-21

1992-11-24

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Magnetometers

505846, G01R 33035

Patent

active

051666146

ABSTRACT:
A pickup coil and a planar type SQUID are formed integrally on a single substrate to form a SQUID magnetometer. The SQUID is disposed on the surface of a projecting portion of the substrate and an insulating layer for spacing is laminated on the SQUID. The top, bottom and side surfaces of the assembly of the SQUID and insulating layer covering the same are all covered with a superconducting layer to form a magnetic shield for enclosing the SQUID. The magnetic shield is remote from the planar type pickup coil disposed on the remaining portion of the substrate by a distance which is equal to or greater than a length of one side of the size of the magnetic shield, thereby preventing magnetic flux distortion due to the presence of the magnetic shield from disturbing coil balance of the pickup coil.

REFERENCES:
patent: 4591787 (1986-05-01), Hoenig
patent: 4694567 (1987-09-01), Daalsmans
patent: 4700135 (1987-10-01), Hoenig
patent: 4749946 (1988-06-01), Hoenig
patent: 4761611 (1988-08-01), Hoenig
patent: 4801882 (1989-01-01), Daalmans
Boudarenko et al., "A planar thin-film SQUID of high inductive coupling constant", Cryogenics, vol. 23, No. 5, May 1983, pp. 263-264.
Nakanishi et al., "2-Channel DC-SQUID Magnetometer System For Biomagnetic Application", Biomagnetism '87, 1988, pp. 446-449.
Ketchen et al., "Ultra-Low-Noise Tunnel Junction DC SQUID With A Tightly Coupled Planar Input Coil", Appl. Phys. Letters, 40(8), Apr. 15, 1982, pp. 736-738.

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