Method and apparatus for monitoring the relative position of a l

Details Method and apparatus for monitoring the relative position of a l Method and apparatus for monitoring the relative position of a l

1975-08-28

1976-12-07

Smith, Alfred E.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356169, H01J 3912

Patent

active

039964639

ABSTRACT:
An improved method and apparatus are disclosed for monitoring relative movement between an incident beam of substantially coherent light and a grating on which the beam is directed, wherein light from the beam passing through the grating is sensed by a photodetector, and the cycles in the photodetector output signal are counted. The improvement comprises patterning the beam, transforming the patterned beam into a Fraunhofer diffraction pattern, and further diffracting the Fraunhofer diffraction pattern with the grating to cause an interference image, which is detected by the photodetector. Each two cycles in the output signal of the photodetector then correspond to a relative movement of the beam past one grating period.

REFERENCES:
patent: 3755682 (1973-08-01), Russell
patent: 3759618 (1973-09-01), Rogers et al.
patent: 3851180 (1974-11-01), Kato et al.
patent: 3867035 (1975-02-01), Kaul
patent: 3891321 (1975-06-01), Hock
patent: 3902036 (1975-08-01), Zaleckas
patent: 3930732 (1976-01-01), Holly

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