Focusing detector having a scanning grating used both as a beam

Details Focusing detector having a scanning grating used both as a beam Focusing detector having a scanning grating used both as a beam

1986-10-22

1989-03-28

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

354407, G01J 120

Patent

active

048166642

ABSTRACT:
A scanning grating for a focusing detector and a focusing detector are described. The scanning grating serves as an image scanner and spatial frequency filter and includes at least two surface elements splitting up an incident luminous flux into two spatially separate light fluxes and by means of which, in conjunction with a field lens, two images of the exit pupil, or parts thereof, of an associated optical system are generated in a plane in which at least two photo-receiver systems are mounted. Means acting optically as complementary plane-parallel plates are provided to split up the luminous flux from the optical system into two spatially separate light fluxes.

REFERENCES:
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patent: 3781110 (1973-12-01), Leitz et al.
patent: 3970842 (1976-07-01), Nanba et al.
patent: 3989378 (1976-11-01), Heitmann et al.
patent: 4037958 (1977-07-01), Schmidt et al.
patent: 4048492 (1977-09-01), Hartmann
patent: 4117325 (1978-09-01), Holle et al.
patent: 4339176 (1982-07-01), Lee
patent: 4591256 (1986-05-01), Matsumura

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