Electricity: measuring and testing – Magnetic – Magnetometers
Patent
1983-12-16
1986-05-27
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
Magnetometers
324260, 336DIG1, 307306, 357 5, G01R 3302
Patent
active
045917876
ABSTRACT:
A multi-channel device for the measurement of variable magnetic fields produced by various field sources, with field strengths of less than 10.sup.-10 T, having in each channel a superconducting quantum interference device (SQUID), a gradiometer consisting of superconducting coils of predetermined dimensions, and superconducting connecting elements between the quantum interference device and the gradiometer. In addition, electronic equipment for the evaluation, processing and presentation of the information obtained at the quantum interference devices is provided. To increase the sensitivity of the measurement device by taking into account the distance between the field source and the gradiometer coil, the dimensions (diameter d) of the individual gradiometer coils (17.sub.j, 19.sub.j) are adjusted, according to the invention, to the distance to the closest magnetic field source and means are provided for combining the signals of individual predetermined gradiometer coils in each case to one signal of a corresponding group (D.sub.1 to D.sub.4 ; K.sub.1 to K.sub.4) of gradiometer coils, depending on the distance of the magnetic field source to be detected in each case.
REFERENCES:
Ketchen et al., "Superconducting Thin-Film Gradiometer", J. Appl. Phys., vol. 49, No. 7, Jul. 1978, pp. 4111-4116.
Ehnholm et al., "Thin Film SQUID's for Magnetic Field Measurements", Jap. J. Appl. Phys., vol. 16, 1977, pp. 261-263.
Barbanera et al., "A SQUID Device for AC Current Measurements Down to 10.sup.-14 A", J. Appl. Phys., vol. 49, No. 2, Feb., 78, pp. 905-909.
"SQUIDS and Their Applications in the Measurement of Weak Magnetic Fields" by Swithenby (J. Phy. E: Sci. Instrum., vol. 13, 1980, at pp. 801 to 813).
"Biomagnetism-Proceedings, Third International Workshop on Biomagnetism", Berlin 1980, Berlin/New York 1981 at pp. 3 to 31.
"Biomagnetism" by Williamson and Kaufman (Journal of Magnetism and Magnetic Materials, vol. 22, 1981 at pp. 129 to 201).
"A New Multi-Element rf SQUID System and its Application to the Magnetic Vector Gradiometer" by Shiraw et al., (Cryogenics, Dec. 1981, pp. 707 to 710).
"Advances in SQUID Magnetometers" by Clarke (IEEE Transactions on Electron Devices, vol. ED-27, No. 10, Oct. 1980, pp. 1896 to 1908).
Edmonds Warren S.
Moran John Francis
Siemens Aktiengesellschaft
Strecker Gerard R.
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