Focusing technique for an optical sensing system

Details Focusing technique for an optical sensing system Focusing technique for an optical sensing system

1987-10-19

1989-01-17

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

354405, G01J 120

Patent

active

047989475

ABSTRACT:
By placing a mirror in the field of view of an infrared imager it is caused to produce an image of its own detector assembly which is correctly focussed when the lens system is focussed at infinity. This phenomenon is used either manually or automatically to focus the system.

REFERENCES:
patent: 4267440 (1981-05-01), Kitai et al.
patent: 4431289 (1984-02-01), Kajita et al.

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