Method for no-contact measurement

Details Method for no-contact measurement Method for no-contact measurement

1974-06-19

1976-11-02

Wilbur, Maynard R.

Optics: measuring and testing

Velocity or velocity/height measuring

With light detector

356 4, 356167, G01P 336

Patent

active

039893782

ABSTRACT:
Method for no-contact measurement of the relative velocity, position, or displacement path of objects without special optical markers with respect to a reference position in at least one coordinate direction, or of the degree of image quality of an image wherein the apparatus images the object on a grating and the light fluxes leaving this grating are measured by means of photoelectric elements. The output signals of the photoelectric elements exhibit a frequency component proportional to the velocity of travel. The present invention is distinguished from the prior art by having a physical beam splitter (6,13) inserted in the imaging beam path in front of the grating (5,14), and preferably several polarizing beam splitters (7,30-33) with at least respectively one associated photoelectric receiver pair (10,11,16-19 16'-19') are connected after the grating (5,14).

REFERENCES:
patent: 2772479 (1956-12-01), Doyle
patent: 3198061 (1965-08-01), Hock
patent: 3482107 (1969-12-01), Hock
patent: 3856403 (1974-12-01), Maughmer

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