Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1974-08-16
1976-08-17
La Roche, Eugene
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250227, 250572, 356200, G01N 2132
Patent
active
039756440
ABSTRACT:
A material monitoring apparatus and method for determining the quality of a sheet of material by detecting dirt particles, flaws in the contents of the material or the composition of the material. The apparatus includes a housing held by a support and positioned above the sheet of material being monitored. A plurality of photoelectric sensing devices are located within the housing. A series of apertures of progressively different sizes are located one behind the other in the longitudinal direction on the bottom of the housing facing the sheet of material. Each of the photoelectric sensing devices are positioned to receive light entering through a respective one of the apertures, wherein the amount of light received is dependent upon the quality of the sheet material being monitored. The light received by the photoelectric sensing devices are converted into electrical signals by means of electronic control circuitry. These electrical signals are then appropriately used to indicate the quality of the material being monitored.
REFERENCES:
patent: 3257563 (1966-06-01), Laurent
patent: 3427462 (1969-02-01), Cist
patent: 3531650 (1970-09-01), Cronin
patent: 3566083 (1971-02-01), McMillin
patent: 3797943 (1974-03-01), Nagao et al.
patent: 3885131 (1975-05-01), Franceschini et al.
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