Symmetrical carrier frequency interferometer

Details Symmetrical carrier frequency interferometer Symmetrical carrier frequency interferometer

1992-01-27

1993-12-14

Turner, Samuel A.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

356349, 356351, 356356, G01B 1102

Patent

active

052707938

ABSTRACT:
Symmetrical carrier frequency interferometer for length, distance and speed measurements with beam-deflecting and beam-splitting elements, as well as a fixed reference mirror and a movable measurement mirror. The optically active surfaces positioned downstream of a first polarization-splitting layer are arranged in mirror-symmetrical manner with respect to the latter. Upstream of a second polarization-splitting layer inclined by 45.degree. a .lambda./2 plate is located in one of the two beam paths and in the passage direction behind said layer are located the .lambda./4 plate, the fixed reference mirror and the movable measurement mirror. There is at least one reversing element in the reflection direction.

REFERENCES:
patent: 4746216 (1988-05-01), Sommargren
patent: 4802764 (1989-02-01), Young et al.
patent: 4807997 (1989-02-01), Sommargren

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