Method and device for inspecting a moving sheet material for str

Details Method and device for inspecting a moving sheet material for str Method and device for inspecting a moving sheet material for str

1979-10-17

1981-06-23

Corbin, John K.

Optics: measuring and testing

By monitoring of webs or thread

For flaws or imperfections

250563, 250572, 356239, G01N 2189

Patent

active

042747481

ABSTRACT:
Subtle streaklike defects in running webs and sheets are identified by transversely scanning adjacent lateral sections of the webs or sheets by means of radiant energy means. Transmitted or reflected radiation is received on corresponding photocells that produce measurement signals that are representative of a defect in the webs or sheets. The signal-to-noise ratio of the measurement signals is increased by multiplicative correlation, on the condition that the ratio of the signal component V.sub.d to the effective noise component V.sub.n of the measurement signal V.sub.m is greater than one.

REFERENCES:
patent: 4005281 (1977-01-01), Faulhaber et al.

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