Linear encoder using diverging light beam diffraction

Details Linear encoder using diverging light beam diffraction Linear encoder using diverging light beam diffraction

1997-10-07

1999-06-01

Turner, Samuel A.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01B 902

Patent

active

059092831

ABSTRACT:
A linear encoder characterized as having a few number of parts including a light source that directs a beam of light onto the grating of a movable scale where reflected diffracted beams from two locations on the scale interfere with one another to form light fringe bands on a plane. In one embodiment, a Ronchi grating is located on the plane having lines with a spacing equal to the spacing of the light fringe bands. The combination of the Ronchi lines and the bands of the fringe pattern form a Moire pattern which is transmitted through the Ronchi grating and whose spatial distribution of intensity moves as the scale is moved and is detected by a photodetector array. The photodetector array converts the signal from the Moire pattern to a sinusoidal expression of displacement whose phase is used to determine displacement of the scale.

REFERENCES:
patent: 5355220 (1994-10-01), Kobayashi
patent: 5486923 (1996-01-01), Mitchell
patent: 5559600 (1996-09-01), Mitchell
patent: 5621527 (1997-04-01), Kaneda et al.

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