Apparatus for detecting position of a rotating element using a two-grating moire pattern
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United States of America Patent
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-
Oct 4, 1988
Grant Date -
N/A
app pub date -
Oct 3, 1986
filing date -
Oct 3, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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Cited Art Landscape
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