Compact magnetometer probe and an array of them covering the who

Details Compact magnetometer probe and an array of them covering the who Compact magnetometer probe and an array of them covering the who

1991-12-13

1994-05-03

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Magnetometers

1286531, 505846, G01R 33035, A61B 504, A61B 505

Patent

active

053090950

ABSTRACT:
A sensor element of thin film components and fiber glass, and a support structure of fiber glass; when sensor elements are attached to the support structure, a sensor system for magnetoencephalographic measurements is formed. A substrate containing a planar signal coil and a SQUID is attached on a circuit board of fiber glass using a spring cut on the edge of a body plate. On the sensor element, is a small but mechanically stable connector or several such connectors (5); when the sensor element is plugged in receptacles (6) on the support structure (7), the element settles in a well defined orientation. Support structure (7) is made of a fiber glass shell following the shape of the bottom (10) dewar vessel, adapted to the shape of the head. The receptacles (6) are attached to the glass fiber shell by springs (9) made of thin fiber glass plate such that an array covering the whole skull as evenly as possible is formed when the sensor elements are plugged to the receptacles. The spring is cut to enable rotation only around an arbitrary axis in the plane of the spring and a translation only in a direction perpendicular to the plane of the spring. When this support structure is inserted in the dewar, individual sensor elements lean against the dewar bottom (10) by aid of three feet (11), pressed by springs (9), settling perpendicularly to the normal of the dewar bottom passing through the center of the sensor element.

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R. Hari et al, "Cerebral Magnetic Fields", CRC Critical Rev. in Biomedical Engineering, vol. 14, 1986, pp. 93-126.
G. B. Donaldson et al, "Integrated Thin Film Instruments", Superconducting Quantum Interference Devices . . . , 1985, pp. 729-759 Walter de Gruyter & Co. Berlin, New York.
T. Ryhanen et al, "SQUID Magnetometers for Low-Frequency Applns.", Journ. of Low Temp. Physics, vol. 76, 1989, pp. 287-386.
D. S. Buchanan et al, "Microsquid: A Close-Spaced Four Channel Magnetometer", Adv. in Biomagnetism, 1989, pp. 677-679 Plenum Press, New York.

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