If the threshold of the grey scale value is fallen

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Unformatted text preview: sto Didactic GmbH & Co. KG • FP 1110 15. Special designs and variants of proximity sensors 15.2.5 Printing mark sensors Printing mark sensors are used for the detection of printed contrast markings, e.g. of printed black-white or coloured marks on packaging materials, identification codes on storage containers. Other examples include positioning with printing, for applying glue or for cutting material widths according to patterns, or for cutting labels or bags. Printing mark sensors are also described as marking readers/scanners. Printing mark sensors operate similarly to diffuse sensors, except for one difference in that the emitting beam is focussed on a specific sensing distance. Printing mark sensors are able to detect very slight contrast differences, whereby differences in colour can also be interpreted as contrast differences. The object must be within certain tolerances of the switching distance of the proximity sensor. The strength of radiation reflected by the object is compared in...
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This note was uploaded on 11/01/2012 for the course CHEMICAL 102 taught by Professor Jamesrodriguez during the Spring '12 term at Universidad Politécnica de Cartagena.

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