Optical imaging system provided with an opto-electronic detectio

Details Optical imaging system provided with an opto-electronic detectio Optical imaging system provided with an opto-electronic detectio

1980-06-11

1982-10-26

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250561, G01J 120

Patent

active

043563929

ABSTRACT:
An optical imaging system is described which is provided with an opto-electronic detection system for determining a deviation between the image plane of the imaging system and a second plane on which an image is to be formed by the imaging system. After a first reflection on the second plane an auxiliary beam which is obliquely incident on said plane is reflected along itself and mirror-inverted, is subsequently reflected a second time on the second plane, and is finally incident on two detectors. The difference signal of the detectors, which is a measure of the deviation, is unaffected by tilting of the second plane and by local variations in reflectivity of in said plane.

REFERENCES:
patent: 3775012 (1973-11-01), Ling et al.
patent: 4136949 (1979-01-01), Hayamizu et al.
patent: 4212534 (1980-07-01), Bodlaj

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