Optical interferometer

Details Optical interferometer Optical interferometer

1975-04-21

1977-06-07

Corbin, John K.

Optics: measuring and testing

Refraction testing

Prism engaging specimen

356113, G01B 902

Patent

active

040279766

ABSTRACT:
An optical interferometer, particularly for use in measurements of length, employs a light transmissive splitting cube which is provided with three beam splitting faces in parallel to each other. A light bundle entering the splitting cube is split into two partial light bundles.
After passage of an optical path within the splitting cube both partial light bundles interfere with each other and produce an interference pattern. Light portions of said interference pattern interfere with each other after having passed separate light paths. Both interference patterns so produced are 90.degree. phase-shifted relative to each other. This phase shift permits a unique determination of direction in variations of length.

REFERENCES:
patent: 3225644 (1965-12-01), Schuck
patent: 3661464 (1972-05-01), Hubbard

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