Photo electric light detection devices

Details Photo electric light detection devices Photo electric light detection devices

1977-11-22

1979-12-25

Tokar, M.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250209, G02B 514

Patent

active

041807022

ABSTRACT:
A photo electric light detection device comprising an array of photodiodes is disposed at an end face of a light conducting rod in order to produce an output signal proportional to light incident on the surface of the rod and transmitted to the end face by total internal reflection. The array of photodiodes is subdivided into high and low pass frequency sub-arrays and the output signals from the sub-arrays are summed and processed to compensate for stray light. The device is useful in connection with a line scanner for detecting anomalies in a moving band.

REFERENCES:
patent: 3274392 (1966-09-01), Harling
patent: 3501632 (1970-03-01), Kaminskas
patent: 3777149 (1973-12-01), Marcatili

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