Radiant energy – Photocells; circuits and apparatus – With circuit for evaluating a web – strand – strip – or sheet
Patent
1995-07-10
1997-02-11
Le, Que T.
Radiant energy
Photocells; circuits and apparatus
With circuit for evaluating a web, strand, strip, or sheet
25055941, 356237, G01N 2186
Patent
active
056024010
ABSTRACT:
A system for processing particle size and position data for a surface under inspection, the system including an air spindle for rotating and a translation stage for translating the surface with respect to a beam of radiation used to detect particles on the surface; a rotational encoder for dividing the surface into a number N of angular vectors; a counter of counting the number of revolutions of the surface; a processor for collecting particle size and position data at each angular vector during each revolution; first and second FIFO memories having at least N address spaces, each address space allocated for a specific angular vector; and a routine for writing the collected particle size and position data to the first memory and for reading particle size and position data from the second memory and switching memories every M revolutions. The FIFO memories are programmed to store only the greater of stored size data and incoming size data.
REFERENCES:
patent: 33357 (1990-09-01), Randall
patent: 4134684 (1979-01-01), Jette
Allen Nicholas
Boudour Abdu
Broude Sergey V.
Chase Eric
Johnson Carl
Le Que T.
QC Optics, Inc.
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