Optics: measuring and testing – By monitoring of webs or thread
Patent
1993-10-12
1995-11-14
Rosenberger, Richard A.
Optics: measuring and testing
By monitoring of webs or thread
25055929, G01N 2147
Patent
active
054671949
ABSTRACT:
A method and apparatus for identifying a moving web in a paper making machine are disclosed. The method includes of the steps of illuminating the web with the light from a transmitter, reflecting the transmitted light off the web, receiving the reflected light with a light transducer to produce an electrical signal corresponding to the intensity of the received light, and identifying the moving web based on the received signal. The intensity of the transmitted light is adjusted so that the received light signal from the transducer is normalized with respect to an optimum value. The apparatus includes a light transmitter, a light receiver, and a control and identification circuit which identifies the web based on a signal from the light receiver, and which adjusts the intensity of the light transmitter to optimize the reception of the signal from the light receiver in order to minimize the effects of environmental interference.
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Ahola Juhani
Erkkila Kari
Koiranen Jukka
Pellinen Kari
Vahatalo Harri
Rosenberger Richard A.
Valmet Paper Machinery Inc.
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