Noise canceling high-sensitive magnetometer

Details Noise canceling high-sensitive magnetometer Noise canceling high-sensitive magnetometer

1991-03-14

1993-10-12

Snow, Walter E.

Electricity: measuring and testing

Magnetic

Magnetometers

505846, G01R 3316, G01R 3335

Patent

active

052529215

ABSTRACT:
A high-sensitive magnetometer has two SQUIDs each comprising a superconducting loop with one or more Josephson junctions and also has a coil comprising a continuous loop for providing magnetic flux of input signals to each of the SQUIDs in opposite directions. The magnetic flux of the input signals is detected by sums of output voltages of the SQUIDs. Magnetic flux noises equally applied on the two SQUID are cancelled by the continuous loop and at addition of the output voltages of the SQUIDs, thus large output signals can be obtained because sums of the two SQUID output signals are obtained.

REFERENCES:
patent: 4280095 (1981-07-01), Hinton
patent: 4588947 (1986-05-01), Ketchen
patent: 4851776 (1989-07-01), Goto et al.
patent: 5053707 (1991-10-01), Yuyama et al.
IEEE Transactions on Magnetics, vol. MAG-17, No. 1, Jan. 1981, pp. 400-403, J. M. Jaycox, et al., "Planar Coupling Scheme for Ultra Low Noise DC Squids".
IBM Technical Disclosure Bulletin, vol. 29, No. 2, Jul. 1986, p. 510, "DC Squid as an Enhanced Magnetometer".
Patent Abstracts of Japan, vol. 015, No. 083, (P-1171), Feb. 26, 1991, & JP-A-2 298 878, Dec. 11, 1990, N. Fujimaki, "Superconducting Device".

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