发明名称 |
METHOD AND APPARATUS FOR ON-LINE MEASUREMENT OF PULP FIBRE SURFACE DEVELOPMENT |
摘要 |
A method and apparatus for monitoring the fibre 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 fibres 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 onto a signal processor which generates an output corresponding to the maximum photodetector output value, and this represents an index of the degree of fibre surface development.
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申请公布号 |
CA2194957(C) |
申请公布日期 |
2001.01.02 |
申请号 |
CA19952194957 |
申请日期 |
1995.07.18 |
申请人 |
PULP AND PAPER RESEARCH INSTITUTE OF CANADA |
发明人 |
BENTLEY, ROGER G.;HAMILTON, R. KEITH;JACK, J. STEWART;BARRON, ROBERT L. |
分类号 |
G01N21/21;G01N33/34;(IPC1-7):G01N21/21 |
主分类号 |
G01N21/21 |
代理机构 |
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地址 |
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