Electricity: measuring and testing – Magnetic – Magnetometers
Patent
1987-03-31
1989-01-31
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
Magnetometers
128653, 357 5, G01R 33035, G01R 33022, H01L 3922
Patent
active
048018821
ABSTRACT:
A SQUID magnetometer is disclosed which can be fabricated by thin-film technology and used for apparatus for measuring weak magnetic fields. It contains a d-c SQUID with a SQUID loop surrounding the effective area of a coupling hole as well as a superconducting flux transformer with a gradiometer coil and a coupling coil surrounding the coupling hole thereby to achieve an effective inductive coupling of a measuring signal into the SQUID. To this end, the invention provides a separate superconducting surface (3a) with the coupling hole (4), to which the coupling coil (8) and or the SQUID loop (12) is/are assigned. The coupling coil (8) surrounds the SQUID loop (12) while maintaining a sufficient distance (e) for d-c decoupling.
REFERENCES:
patent: 3244974 (1986-04-01), Dumin
patent: 4588947 (1986-05-01), Ketchen
Muhlfelder et al., Double Transformer Coupling to a Very Low Noise Squid; IEEE Transactions on Magnetics, vol. Mag.-19, No. 3, May 1983, pp. 303-307.
Radio Engineering & Electronic Physics, vol. 29, No. 2, (1984) Feb. pp. 109-115, Silver Spring, MD, US; S. I. Bondarenko et al.: "Thin-Film Squids for Superconducting Magnetic Flux Measuring Devices".
Journal of Applied Physics, vol. 53, No. 11, Nov. 1982, pp. 7592-7598, New York US; P. Carelli et al., "Behaviour of a Multiloop DC Superconducting Quantum Interference Devices".
Planar Coupling Scheme For Ultra Low Noise DC Squids, Jaycox et al., IEEE Transaction on Magnetics, vol. Mag.-17, No. 1, Jan. 1981, pp. 400-403.
Squids and Their Applications in the Measurement of Weak Magnetic Fields by S. J. Swithenby; J. Phys. E: Sci. Instrum., vol. 13, 1980, pp. 801-813. Pinted in GT. Britain.
Advances in Squid Magnetometers by J. Clarke; IEEE Transactions on Electron Devices, vol. Ed-27, No. 10, Oct. 1980; pp. 1896-1908.
Instrumentation For Biomedical Applications by T. Katila; "Biomagnetism-Proceedings of the Third International Workshop on Biomagnetism, Berlin 1980" Walter de Gruyter & Co., Berlin/New York 1981, pp. 5-31.
Siemens Aktiengesellschaft
Strecker Gerard R.
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