Electricity: measuring and testing – Magnetic – Magnetometers
Patent
1983-12-16
1988-06-07
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Magnetic
Magnetometers
307306, G01R 3302, H03K 338
Patent
active
047499460
ABSTRACT:
An improved device for the multi-channel measurement of weak variable magnetic fields with fields strengths below 10.sup.-10 T, having in each channel a superconducting quantum interference device (SQUID), a gradiometer consisting of superconducting coils and superconducting elements between the quantum interference device and the gradiometer, and a coupling transformer and connecting leads. In addition, the device includes electronic equipment for the evaluation, processing and presentation of the information obtained at the quantum interference elements. In order to use this measurement device to obtain spatial field distributions, particularly those of biomagnetic fields, during reasonable measuring times, with a substantial coherence among the field data, the invention provides for a rigid substrate on which direct-current quantum interference devices with associated planar-designed gradiometer coils and the superconducting connecting elements are arranged, and in which case the coils and the connecting elements are thin-film structures on at least one level.
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patent: 4613817 (1986-09-01), Hoenig
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"SQUIDS and their applications in the measurement of weak magnetic fields", by Swithenby (J. Phys. E: Sci. Instrum., vol. 13, 1980, at pp. 801 to 813).
"Advances in SQUID Magnetometers", by Clarke (IEEE Transactions on Electron Devices, vol. ED-27, No. 10, Oct. 1980, at pp. 1896 to 1908).
"Biomagnetism-Proceedings, Third International Workshop on Biomagnetism, " Berlin 1980, Berlin, New York, 1981 at pp. 3 to 31).
SQUID Superconducting Quantum Interference Devices and their Applications, Berlin, New York, 1977, pp. 395 to 431.
Shirae et al., "A new multi-element rf SQUID system and its application to the magnetic vector gradiometer", Cryogenics, Dec. 1981, pp. 707 to 710.
Edelman Lawrence C.
Eisenzopf Reinhard J.
Siemens Aktiengesellschaft
Snow Walter E.
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