Optics: measuring and testing – By monitoring of webs or thread – For flaws or imperfections
Patent
1980-04-15
1981-05-19
Corbin, John K.
Optics: measuring and testing
By monitoring of webs or thread
For flaws or imperfections
250563, G01N 2186, G01N 2189
Patent
active
042681723
ABSTRACT:
A laminate (32), having holes of different sizes and shapes formed therein, is moved above successive scans of light from a light source (48). A light sensor (58), responsive to light passing through each of the holes, develops a light pulse for each hole during each scan having a level proportional to the amount of light sensed. The level of each light pulse is compared with a preset threshold level and a threshold pulse is developed when the light pulse level exceeds the threshold level. The threshold pulse facilitates the reduction of the preset threshold level so that, when the next subsequent light pulse from the same hole exceeds the reduced threshold level, an additional threshold pulse is produced. The threshold pulses are used within a system (46) to generate an indication of the number of holes formed in the laminate (32).
REFERENCES:
patent: 3708678 (1973-01-01), Kreda
patent: 3846623 (1974-11-01), Wefers et al.
patent: 4002830 (1977-01-01), Brown et al.
patent: 4040748 (1977-08-01), Belleson et al.
patent: 4054360 (1977-10-01), Oosaka et al.
patent: 4205769 (1980-06-01), Blitchington
Arnold Bruce Y.
Corbin John K.
Hoofnagle J. B.
Western Electric Company Inc.
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