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Method for Interference Suppression in a Measuring Device

  • US 20090184709A1
  • Filed: 02/11/2005
  • Published: 07/23/2009
  • Est. Priority Date: 02/13/2004
  • Status: Active Grant
First Claim
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1. A method for shielding an assembly of sensors that measures biomagnetic signals from external interferences, the assembly of sensors comprising at least one sensor, characterised in that the method comprises the steps of:

  • providing the assembly of sensors with at least one magnetic feedback, wherein the difference signal of one feedback is obtained from at least one sensor of the aforementioned assembly of sensors;

    producing in the region of the assembly of sensors a magnetic field that compensates for external interferences with at least one actuator disposed outside the assembly of sensors; and

    the difference signal that produces a compensation voltage in the actuator is a linear combination of the signals of one or more sensors; and

    using the SSS method to separate the biomagnetic useful signal being measured from the signals (originating from outside the measurement region), which signals are produced by the actuators and the external interferences.

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