Method and apparatus for monitoring and controlling the velocity

Details Method and apparatus for monitoring and controlling the velocity Method and apparatus for monitoring and controlling the velocity

1989-12-29

1992-09-08

Schor, Kenneth M.

Paper making and fiber liberation

Processes and products

With measuring, inspecting and/or testing

162259, 162262, 162263, 162344, 425145, D21F 106

Patent

active

051455609

ABSTRACT:
The jet velocity along a slice opening of a papermaking machine is monitored at plural locations to provide a jet velocity profile. This jet velocity profile may be adjusted to more closely match a reference velocity profile for the jet. Preferably, microwave doppler-effect velocity sensors are utilized for sensing a jet velocity. In one specific embodiment of the invention, preamplifier and automatic gain control circuitry is used to minimize variations in the sensed signal due to changing conditions of the jet.

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