Defocused unicell photometer with diffusion zone

Details Defocused unicell photometer with diffusion zone Defocused unicell photometer with diffusion zone

1977-01-31

1978-09-05

Corbin, John K.

Optics: measuring and testing

Photometers

Photoelectric

250237R, G01J 142, H01J 314

Patent

active

041115619

ABSTRACT:
A defocused unicell photometer of the type having a positive lens element is provided with at least one diffusion zone on a portion of the lens element surface to change the directional response characteristic of the photometer in a select manner without increasing the extreme field of view of the photometer.

REFERENCES:
patent: 3162766 (1964-12-01), Ploke
patent: 3880528 (1975-04-01), Petersen
patent: 4040751 (1977-08-01), Baker et al.

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