Measuring and testing – Vibration – By mechanical waves
Reexamination Certificate
2011-05-17
2011-05-17
Saint Surin, Jacques M (Department: 2856)
Measuring and testing
Vibration
By mechanical waves
C073S599000, C073S602000, C073S628000
Reexamination Certificate
active
07942057
ABSTRACT:
A method for monitoring the structural state of a fiber web (1) that is being processed by a fiber web processing machine comprising a fiber web processing station (2) is described. The method comprises the steps of arranging a generator (5) and a detector (6) of a generator-detector unit (4) on opposite sides of the traveling fiber web (1) downstream of the fiber web processing station; bringing the generator to emit an ultrasonic wave; bringing the detector to receive the ultrasonic wave; sending a signal representing the received ultrasonic wave to a control unit (10); and, in the control unit, analyzing the signal and extracting a value from the signal representing a measure of the received ultrasonic wave. A system for monitoring the structural state of a fiber web is also described.
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Björklund Magnus
Lif Jan
Lindh Susanne
Pettersson Thorulf
Greer Burns & Crain Ltd.
Saint Surin Jacques M
Stora Enso AB
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