Interferometric rotating condition detection apparatus

Details Interferometric rotating condition detection apparatus Interferometric rotating condition detection apparatus

1990-02-20

1990-10-30

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237G, 356356, G01D 534

Patent

active

049670727

ABSTRACT:
A rotating condition detection apparatus includes a light source for illuminating a radial lattice having a plurality of lattice patterns marked on a periphery of a rotating body at an equi-angle; an optical unit for superimposing two refraction lights having a predetermined number of order reflected in two predetermined directions by the radial lattice; a photosensing device for sensing the superimposed light; and a detector for detecting a rotating condition of the rotating body in accordance with the output of the photosensing means.

REFERENCES:
patent: 3458709 (1969-07-01), Beall, Jr. et al.
patent: 3630622 (1971-12-01), De Lang et al.
patent: 3726595 (1973-04-01), Matsumoto
patent: 3738753 (1973-06-01), Huntley, Jr.
patent: 3756723 (1973-09-01), Hock
patent: 3891321 (1975-06-01), Hock
patent: 4676645 (1987-06-01), Taniguchi et al.

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