Method of determining the angular position of a workpiece and ap

Details Method of determining the angular position of a workpiece and ap Method of determining the angular position of a workpiece and ap

1974-07-10

1976-04-27

Wilbur, Maynard R.

Optics: measuring and testing

Angle measuring or angular axial alignment

With photodetection remote from measured angle

250561, 356110, 356156, 356169, G01B 1126

Patent

active

039531333

ABSTRACT:
The angular position of a workpiece relative to a reference direction is determined by means of an optical correlator including an imaging system and an optical grating. The workpiece is imaged on the grating and means are provided for effecting a relative lateral displacement between the image and the grating. Photoelectric receiver means are positioned behind the grating in the direction of light flux for generating electrical signals of which the value depends on the angular position of the workpiece relative to the grating. The correlator is rotatable about its optical axis and the electrical signals are of an extreme value when the workpiece and the grooves of the grating are in alignment. Detecting means are connected to the receiver means for sensing this extreme value.

REFERENCES:
patent: 3533702 (1970-10-01), Hock et al.
patent: 3683195 (1972-08-01), Johannsmeir et al.
patent: 3856400 (1974-12-01), Hartmann et al.

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