System for inspecting can lids for through the lid flaws

Details System for inspecting can lids for through the lid flaws System for inspecting can lids for through the lid flaws

1976-04-15

1978-04-25

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250223R, 356201, G01N 2132

Patent

active

040864979

ABSTRACT:
A method for detecting light passing flaws in discrete elements, which are normally opaque to visible light, characterized by a sampling technique to enhance the signal to noise ratio of the ultimate signal. The ultimate signal is a composite signal generated by the addition of a number of discrete sample signals, each signal representing both a repeating reaction of a photosensitive means to light passing through flaws in the normally opaque element, and random ambient signal noise.

REFERENCES:
patent: 3340400 (1967-09-01), Quittner
patent: 3807877 (1974-04-01), Yee
patent: 3991882 (1976-11-01), Fahnestock et al.
patent: 3994590 (1976-11-01), Di Martini et al.
patent: 4002823 (1977-01-01), Van Oosterhout

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