Optical linear encoder

Details Optical linear encoder Optical linear encoder

1989-02-22

1990-12-25

Willis, Davis L.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

250237G, 356374, G01B 902

Patent

active

049798278

ABSTRACT:
An averaged diffraction moire position detector has a pair of diffraction gratings. One of the gratings has two grating portions arranged with an offset of half a pitch of the transit portions and the non-transit portions for light. The intensities of light passing through respective grating portions are added to cancel any error component is displacement signals produced when two parts of, for example, a machine tool move. Another averaged diffraction moire position detector uses offset in phase of respective error components contained in the diffracted light of plus and minus of the same number-order. Thus, the intensities of respective diffracted light are added to cancel respective error components, resulting in correct displacement signals being produced.

REFERENCES:
patent: 4278273 (1988-10-01), Michel
patent: 4776701 (1988-10-01), Pettigrew

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