Electricity: measuring and testing – Magnetic – Magnetometers
Patent
1997-03-05
1999-03-09
Strecker, Gerard
Electricity: measuring and testing
Magnetic
Magnetometers
505846, 600409, G01R 33035, A61B 505
Patent
active
058805885
ABSTRACT:
Apparatus for measuring weak magnetic fields includes a cryogenic vessel CR having a domed bottom D for accepting a human head, a plurality of magnetic sensor units 10 mounted upright on the inner surface of the bottom D of the cryogenic vessel CR, an interface device 20 for receiving output signals of the magnetic sensor units 10 through respective lead lines 4, a data processor device 30 for analyzing the output signals of the magnetic sensor units 10 to specify magnetic fields spread in the ambient space about the human head and calculating the activity of a brain B from the magnetic fields, and a display device 40 for displaying the brain activity. Each of the magnetic sensor units 10 is fed along its guide line G through a small opening OP of the cryogenic vessel CR and mounted upright on the bottom D. As the opening OP of the cryogenic vessel CR is relatively small, the evaporation loss of a coolant in the cryogenic vessel CR is minimized and the running cost of the apparatus will be decreased.
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Kanazawa Institute of Technology
Strecker Gerard
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