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Mitch Ames (talk | contribs) ISO 7810 -> ISO/IEC 7810 card |
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== Operating principle ==
The MM feature is encoded in the middle layer of an [[ISO/IEC 7810]] card as a [[bar code]] formed by two materials with different electrical properties.<ref name="ct1996"/> A capacitive sensor head near the magstripe reader observes the alternating capacity as the card is moved past the sensor and decodes the represented number. This sensor works in a similar fashion to the magnetic read head found in a magstripe card reader, except that it senses not a change in [[magnetic flux]], but a change in the [[dielectric constant]] of the card's material. It reads a second data stripe that, unlike the magstripe, cannot easily be rewritten with off-the-shelf equipment.
== Related technologies ==
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