Quadrature diffractive encoder

Details Quadrature diffractive encoder Quadrature diffractive encoder

1994-08-22

1996-03-05

Hellner, Mark

Optics: measuring and testing

Range or remote distance finding

With photodetection

356356, G01B 1102

Patent

active

054972264

ABSTRACT:
A preferred position detection system for accurate one-dimensional operation is realized using a diffractive encoder which provides two digital output signals 90.degree. out of phase. The two output signals correspond to relative movement between two objects. The diffractive encoder includes: a light source; a collimating lens; a mask; a diffractive grid; four photodetectors; and two comparators. Light from the light source is collimated through the collimating lens, selectively passed through the aperture in the mask, diffracted by the diffractive grid, sensed by the four photodetectors, then compared by the comparators to produce the two digital output signals which represent relative movement between the mask and the diffractive grid.

REFERENCES:
patent: 5000572 (1991-03-01), Nose et al.
patent: 5151754 (1992-09-01), Ishibashi et al.
patent: 5347355 (1994-09-01), Eguchi
patent: 5414514 (1995-05-01), Smith et al.
H. F. Talbot, "Facts relating to Optical Science. No. IV." The London and Edinburgh Philosophical Magazine and Journal of Science. Third Series. vol. 9, No. 56. pp. 401-407. Dec. 1836.

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