Method and device for identifying an electronic code

摘要

A method and device for reading an electronic code. An alternating electrical signal is brought to the code being measured with the aid of electrodes, and the current or voltage travelling through the electrodes is measured. The real and the imaginary components of the current or correspondingly the voltage are defined. The electrodes, being on an essentially lossless surface, an angle correction is made to the real and imaginary components of the current or the voltage in such a way that substantial changes in the current take place only in the imaginary component of the current or voltage.

主权项

1. A method for reading an electronic code, in which method
an alternating electrical signal is brought to the electronic code being measured, with the aid of electrodes, and the current travelling through the electrodes, or the voltage over the electrodes, is measured,wherein
the real and the imaginary components of the current or correspondingly the voltage are defined, the electrodes being on an essentially lossless surface, an angle correction is made to the real and imaginary components of the current or correspondingly the voltage, in such a way that substantial changes in the current or voltage take place only in the imaginary component of the current or voltage, and a measuring frequency of a measuring device, a reading distance of a measuring head from the code, and a resistivity of the code are selected in such a way that the reactance of the capacitance seen by the measuring device is of the same order of magnitude as the resistance of a conductive ink seen by the measuring device.