Apparatus and method for measuring weak, location-dependent and time-dependent magnetic fields
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United States of America Patent
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Oct 6, 1992
Issued Date -
N/A
app pub date -
Oct 9, 1991
filing date -
Sep 23, 1988
priority date (Note) -
Expired
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Abstract
An apparatus for measuring weak, location-dependent and time-dependent magnetic fields emitted from a source situated in an examination subject includes a sensor arrangement having at least ten gradiometers of the first order, each gradiometer being inductively coupled to a DC-SQUID. The sensor arrangement and the examination subject are disposed in a room which shields the examination subject and the sensor arrangement from magnetic fields. The room has a shielding factor of at least 10 for magnetic alternating fields having a frequency of 0.5 Hz, the shielding factor increasing with increasing frequency. A method for operating the apparatus is also disclosed.
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