Apparatus for detecting position of a rotating element using a t

Details Apparatus for detecting position of a rotating element using a t Apparatus for detecting position of a rotating element using a t

1986-10-03

1988-10-04

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237G, H01J 314, H01J 516

Patent

active

047757884

ABSTRACT:
The position and motion of a rotating element is determined by using a two-grating moire pattern. Movement of the element causes a projected scale image representing radiation reflected from the element to shift relative to a fixed grating thereby generating moire fringes. The accumulated fringes serve to measure absolute position and motion of the element.

REFERENCES:
patent: 3427463 (1969-02-01), Weyrauch
patent: 3732424 (1973-05-01), Wojtulewicz
patent: 4025796 (1977-05-01), Erdmann
patent: 4178064 (1979-12-01), Mrdjen

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