Method and apparatus for determining stone cells in paper or...

Details Method and apparatus for determining stone cells in paper or... Method and apparatus for determining stone cells in paper or...

2005-08-30

2005-08-30

Lee, Que T. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

With circuit for evaluating a web, strand, strip, or sheet

C250S556000, C356S071000

Reexamination Certificate

active

06936834

ABSTRACT:
Disclosed is a method and apparatus for determining stone cells within a sample of wood pulp or paper. According to the instant invention a portion of the sample is irradiated with light at a predetermined wavelength or within a predetermined range of wavelengths. The incident light causes those areas of the sample that are occupied by stone cells to fluoresce strongly relative to the background matrix of wood pulp or paper. The strongly fluorescing stone cells are registered digitally using a detector, or are observed visually by an operator viewing the sample through an ocular device. The absolute number of stone cells per unit area or a stone cell size-distribution-plot is obtained using one of automated or manual image analysis.

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