Device for measuring light incident on an optical system

Details Device for measuring light incident on an optical system Device for measuring light incident on an optical system

1981-07-14

1986-06-17

Arnold, Bruce Y.

Optics: measuring and testing

Photometers

Photoelectric

350172, 3501622, G01J 142

Patent

active

045952906

ABSTRACT:
This invention provides a device for measuring light incident on an optical system. This device includes an optical system defining an optical path, a beam splitter and a photo detector. The beam splitter has a relief type diffraction lattice having a plurality of semireflecting surfaces periodically arranged and included in a transparent body. The diffraction lattice is arranged to split a portion of the incident light by its effect of reflection/diffraction and its beam splitting efficiency having a predetermined distribution within the lattice area. The diffracted light from the diffraction lattice is directed to the photo detector.

REFERENCES:
patent: 3464337 (1969-09-01), Tranker
patent: 4103153 (1975-07-01), Matsumoto et al.
patent: 4178084 (1979-12-01), Matsumoto et al.

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