METHOD AND DEVICE FOR DETECTING MAGNETIC FIELD DISTURBING SUBSTANCE, METHOD AND SYSTEM FOR SPECIFYING THE POSITION OF DISTURBING SUBSTANCE AND RECORDING MEDIUM FOR THESE METHODS

摘要

PROBLEM TO BE SOLVED: To provide a method of easily detecting the existence of a disturbing substance in the magnetic field radiated from a magnetic field radiator through simple calculations.

SOLUTION: This method comprises: a step (52) to measure the magnetic field radiated from the magnetic field radiator by at least two triaxial sensors arranged at prescribed different positions; a step (54) that, for these two triaxial sensors, specifies the direction vector coordinates passing from the magnetic field measured by the two triaxial sensors to the geometric centers of the magnetic field irradiator and of the triaxial sensor, positioned on a same straight line; a step (56) to verify if the minimum distance between one direction vector and a plurality of axes located on the same straight line as the direction vector lies is less than the limit value prescribed beforehand; a step (64) to notify the existence of a disturbing substance if the minimum distance is not less than the prescribed limit value; and a step (66) not to make the notification if the minimum distance is less than the minimum value.

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