Light modulation system

Details Light modulation system Light modulation system

1975-06-23

1978-05-23

Smith, Alfred E.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356111, 356169, H01J 3912

Patent

active

040912817

ABSTRACT:
A system for one dimensional or multi-dimensional modulation of light proportional to the path, angle or speed, preferably the photoelectric signal analysis of the movement of an object carrier in an interferometer. At least three consecutive diffraction processes take place in the optical path of which one starts from a point and of which the last condenses the light bundles into at least two points. The light bundles are guided in the same direction of diffraction fulfilling the coherence condition where the surfaces of diffraction are spaced relatively far apart and do not use imaging optics.

REFERENCES:
patent: 3320852 (1967-05-01), Parrent, Jr.
patent: 3768911 (1973-10-01), Erickson
patent: 3830568 (1974-08-01), Allen
Gerasimov, "Use of Diffraction Gratings for Controlling a Ruling Engine", Applied Optics, vol. 6, No. 11, pp. 1861-1865, Nov. 1967.

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