Fizeau fringe light evaluator and method

Details Fizeau fringe light evaluator and method Fizeau fringe light evaluator and method

1977-08-24

1980-09-16

Corbin, John K.

Optics: measuring and testing

By particle light scattering

With photocell detection

356352, G01B 902

Patent

active

042226678

ABSTRACT:
A beam of light to be evaluated for coherence length is projected through an optical cavity having non-parallel reflecting surfaces to form a Fizeau fringe pattern. A multiple detector array senses the light output of the cavity at various locations along the fringe pattern. The sensed values of the light are compared with one another and the polarity of their difference is used to determine whether the coherence length of the light beam is above a predetermined threshold value.

REFERENCES:
patent: 3217591 (1965-11-01), Barr et al.
patent: 3824018 (1974-07-01), Crane, Jr.

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