Optical phase decoder for interferometers

Details Optical phase decoder for interferometers Optical phase decoder for interferometers

1985-07-23

1987-10-27

Willis, Davis L.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

250225, 350394, G01B 902, G01J 404

Patent

active

047026030

ABSTRACT:
Classical distance measuring optical interferometer systems determine the desired measured distance by measuring phase differences between two light waves; two light waves are needed to uniquely determine distance and direction of motion. A third light wave is used for making the system insensitive to variations in brightness of the light source. This invention provides a distance or optical phase decoding system having three output light waves that uses all of the available light for the measurement and provides for increased resolution of measurement through simple rotational adjustments.

REFERENCES:
patent: 3529894 (1970-09-01), Hock
patent: 3601490 (1971-08-01), Erickson
patent: 3771875 (1973-11-01), Russo
patent: 3822942 (1974-07-01), Hock
patent: 3881823 (1975-05-01), DeLang et al.
patent: 3976379 (1976-08-01), Morokuma
patent: 4360271 (1982-11-01), Downs et al.

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