Optics: measuring and testing – By polarized light examination
Patent
1994-07-18
1996-03-19
Rosenberger, Richard A.
Optics: measuring and testing
By polarized light examination
356246, G01N 2121, G01N 2105
Patent
active
055007350
ABSTRACT:
A method and apparatus for monitoring the fiber surface development of pulps due to the refining or beating of mechanical or chemical pulps; an optical cell, fabricated with light-transparent windows, permits an incident collimated beam of light to pass through pulp stock flowing through the cell. The beam is transmitted through a polarizing filter prior to entering the cell, and through a second, crossed, polarizing filter, on exiting from the cell. The exit beam converges onto a photodetector. A gradual variation in the mass of fibers of the pulp stock is established over a predetermined range and this produces a change in the intensity of the transmitted light. As the light intensity changes, it passes through a maximum value; this is accompanied by a similar change in the photodetector electrical output signal. The photodetector signal is fed into a signal processor which generates an output corresponding to the maximum photodetector output value, and this represents an index of the degree of fiber surface development.
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Barron Robert L.
Bentley Roger G.
Hamilton R. Keith
Jack J. Stewart
Pulp and Paper Research Institute of Canada
Rosenberger Richard A.
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