Light alignment detection device

Details Light alignment detection device Light alignment detection device

1989-01-05

1990-02-27

Evans, F. L.

Optics: measuring and testing

By alignment in lateral direction

With light detector

250203R, 356152, 356153, G01B 1100

Patent

active

049040863

ABSTRACT:
An optical alignment detector uses a Fresnel bi-prism (12) on the base of which an incoming beam of light is focussed. When the beam is in alignment, it strikes the base substantially normally and is brought to a focus adjacent a ridge (13) of the bi-prism (12). To cope with a second axis of alignment, a second bi-prism (14) having a ridge (15) is placed beneath the first, with the two ridges (13,15) arranged orthogonally so as to produce four possible pupil entrance images which can be received by four photodetectors (17,18,19,20).

REFERENCES:
patent: 3133200 (1964-05-01), Collyer

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