High angular sensitivity, absolute rotary encoding device with p

Details High angular sensitivity, absolute rotary encoding device with p High angular sensitivity, absolute rotary encoding device with p

1993-10-18

1996-01-09

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25023118, 250237G, G01D 534

Patent

active

054830583

ABSTRACT:
A device for position encoding of a rotating shaft in which a polygonal mirror having a number of facets is mounted to the shaft and a monochromatic light beam is directed towards the facets. The facets of the polygonal mirror direct the light beam to a stand-alone low line density diffraction grating to diffract the monochromatic light beam into a number of diffracted light beams such that a number of light spots are created on a linear array detector. An analog-to-digital converter is connected to the linear array detector for reading the position of the spots on the linear array detector means. A microprocessor with memory is connected to the analog-to-digital converter to hold and manipulate the data provided by the analog-to-digital converter on the position of the spots and to compute the position of the shaft based upon the data from the analog-to-digital converter.

REFERENCES:
patent: 3384754 (1968-05-01), Albarda
patent: 4100408 (1978-07-01), Marshall
patent: 4490608 (1984-12-01), Yeadon et al.
patent: 5103090 (1992-04-01), Weiner et al.
patent: 5266796 (1993-11-01), Leviton
patent: 5329121 (1994-07-01), Leviton

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