Ratiometric edge detector system

Details Ratiometric edge detector system Ratiometric edge detector system

1977-06-30

1980-01-15

Tokar, M.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250560, 250561, G01N 2130

Patent

active

041840801

ABSTRACT:
A ratiometric edge detector system for use in controlling the position of the edge of a web or other material. At least two zones on the web are illuminated with light. The first zone is of greater area than the second zone. The second zone has a border at the web edge. Light reflected from the two zones is optically sensed. A control signal is generated proportional to the ratio of the light reflected from the two zones. The ratio indicates deviation of the web edge from a preselected position.

REFERENCES:
patent: 2962596 (1960-11-01), Leimer et al.
patent: 3431425 (1969-03-01), Brown et al.
patent: 3461302 (1969-08-01), Benson et al.
patent: 3739177 (1973-06-01), Ko
patent: 3777167 (1973-12-01), Shepherd
patent: 3900738 (1975-08-01), McKay

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