Detection of flaws in a moving web of transparent material

Details Detection of flaws in a moving web of transparent material Detection of flaws in a moving web of transparent material

1976-03-09

1977-07-26

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356200, G01N 2132

Patent

active

040385540

ABSTRACT:
A scanning beam of light is arranged to illuminate a moving web of transparent material wherein the transmitted, undeviated beam falls upon a light absorber. A light collecting rod is located so that only a small amount of the undeviated beam is intercepted. When a transparent refracting flaw arrives in the beam, a portion of the light is deviated and illuminates the light collecting rod which contains a photocell at one end and thereby produces a positive electrical impulse designating the presence of a refracting flaw. When a light absorbing flaw arrives in the beam, illumination of the light collecting rod is reduced which produces a negative electrical impulse designating the presence of an opaque flaw. The difference in signal polarity thereby identifies the type of flaw detected.

REFERENCES:
patent: 3743431 (1973-07-01), Cushing et al.
patent: 3814946 (1974-06-01), Takahashi et al.
patent: 3849004 (1974-11-01), Cofek
patent: 3970857 (1976-07-01), Buckson

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