Interferometric angle monitor

Details Interferometric angle monitor Interferometric angle monitor

1980-10-08

1983-07-26

Corbin, John K.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

356363, G01B 902

Patent

active

043951236

ABSTRACT:
Two mutually coherent light beams (50, 58) formed, for example, from a single monochromatic light source (32) are directed to a reflecting surface (20) of a rotatable object (18), such as a mirror, where they are reflected into imaging optical lens (10) having a focal plane optically at infinity whereby a series of interference fringes (14) will be formed in the focal plane (12) which will translate linearly thereacross in response to angular rotation of the object. Photodetectors (22, 24) are located adjacent the focal plane to detect the fringe translation and outputs a signal in response thereto which is fed to a signal processor (30) which is adapted to count the number of fringes detected and develop therefrom a measure of the angular rotation and direction of the object.

REFERENCES:
patent: 3433568 (1969-03-01), Skalski et al.
patent: 3484169 (1969-12-01), Skalski et al.
patent: 3512890 (1970-05-01), McLaughlin
patent: 3764216 (1973-10-01), Bliek et al.
patent: 3982835 (1974-09-01), Schwomma
patent: 4138196 (1979-02-01), Redman
patent: 4183670 (1980-01-01), Russell
De Cou, "Spacecraft Attitude Measurement Using Spatial Coherence of Laser or Star Light", IEEE Trans. on Aerosp. and Elec. Sys., vol. AES7, No. 2, pp. 288-298, 3/71.
De Cou, "Interferometric Star Tracking", Applied Optics, vol. 13, No. 2, pp. 414-424, 2/74.

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