Web scanning apparatus

Details Web scanning apparatus Web scanning apparatus

1982-06-07

1985-06-11

Rosenberger, R. A.

Optics: measuring and testing

By monitoring of webs or thread

For flaws or imperfections

356243, 250571, G01N 2117

Patent

active

045224978

ABSTRACT:
A method and apparatus of photoelectrically scanning a moving web material is described which comprises scanning the web with a narrow light beam sweeping across and beyond the edges of the web, directing light reflected or transmitted by the web to a light receiver of a light measuring unit so generating a corresponding electrical signal, and optically or electronically simulating the optical reflexion or transmission property of the web for two auxiliary scanning zones adjacent the lateral edges of the web in such manner that the average strength of said electrical signal remains constant over substantially the whole scanning sweep.
By use of this method abrupt changes in electronic signals received by the receiver when the scanning beam traverses the edges of the web are minimized. The effect of flare is also reduced.

REFERENCES:
patent: 3803474 (1974-04-01), Clarke
patent: 3826578 (1974-07-01), King et al.
patent: 3843890 (1974-10-01), Anthony et al.
patent: 4108533 (1978-08-01), Sick et al.
patent: 4422766 (1983-12-01), Skukalek

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