Process and apparatus for identifying articles of sheet material by means of microwaves
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United States of America Patent
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Jan 21, 1986
Grant Date -
N/A
app pub date -
Apr 8, 1983
filing date -
Jul 29, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An apparatus for the identification by microwaves of a sheet article composed of an electrically non conductive material, the article being marked for identification by the incorporation therein of electrically conductive fibers. The apparatus comprises at least two microwave emitter devices one adjacent the other with detectors for the waves reflected by the article when advanced before said devices. The apparatus comprises also detectors for the waves transmitted through the article and placed in front of said emitter devices. Regulating methods of the apparatus are also described for raising the sensitivity of the identification signals through setting of the distances between the emitter devices, detectors for transmitted waves and support for the interposed article.
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