Abstract
A new magnetic bar code system is proposed, in which information is coded in a series of anisotropic perrneabilities introduced by, for example, slightly canted magnetic strips. The principal direction of anisotropy with respect to a given direction as a reference can be coded as 1 or 0. This principal direction is detected inductively by using crosscoupled figure-of-eight coils, in which the sign of the mutual inductance changes according to the sign of the angle between the principal direction and the given direction. The readout is not affected by the scanning speed in this system.
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