TY - JOUR
AU1 - Abrunhosa, Sofia
AU2 - Gibb, Ian
AU3 - Macedo, Rita
AU4 - Williams, Emrys
AU5 - Muller, Nathalie
AU6 - Freitas, Paulo P.
AU7 - Cardoso, Susana
AB - Abstract: Information encoding in barcodes using magnetic-based technology is a unique strategy to read data buried underneath non-transparent surfaces since a direct line-of-sight between the code and the reader is not required. This technology is of particular interest in secure labelling and recyclable packaging applications. However, current magnetic reading heads, such as those employed for magnetic ink character recognition, need to be placed in contact with the magnetic structures, limiting the depths at which the information can be read. This paper describes a strategy to overcome that limitation by replacing the traditional inductive heads with tunnel magnetoresistive (TMR) sensors. Soft-magnetic codes can be printed using conventional LaserJet toners and, by having their magnetisation set with a permanent magnet included in the device, the resulting magnetic field can be read using a TMR sensor. We demonstrate that such a device can read barcodes at depths of at least 1 mm. It can also resolve individual structures as thin as 200 {\mu}m when used in contact.
TI - Detecting Magnetic Ink Barcodes with Handheld Magnetoresistive Sensors
JF - Physics
DO - 10.1109/TMAG.2022.3151147
DA - 2022-11-29
UR - https://www.deepdyve.com/lp/arxiv-cornell-university/detecting-magnetic-ink-barcodes-with-handheld-magnetoresistive-sensors-aOEKoOeigq
VL - 2022
IS - 2211
DP - DeepDyve
ER -