Method of electronically correcting position errors in an increm

Details Method of electronically correcting position errors in an increm Method of electronically correcting position errors in an increm

1990-03-28

1991-06-04

Willis, Davis L.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237G, G01D 534

Patent

active

050216503

ABSTRACT:
In the operation of an incremental measuring system, a measuring scale is scanned for generating periodic sinusoidal, analog measured-value signals. Digital countable signals are derived from the measured-value signals in conjunction with an electronic subdivision of the scale and are delivered to an electronic evaluating unit. Each countable signal is associated with a certain phase angle of the measured-value signals. For an electronic correction of position errors, predetermined signal levels are detected at a series of first points, which have an electrical spacing corresponding to a sub-incremental step constituting a fractional part of a scale increment, and these signal levels are alternatively detected at a series of second points, which have the same electrical spacing as the first points and are offset by a fractional part of this spacing, and in accordance with a correction program the measurement is selectively evaluated in response to the signal levels at these points so that corrections can be effected in steps corresponding to only a fractional part of such sub-incremental step.

REFERENCES:
patent: 2336550 (1943-12-01), Kruper
patent: 2985826 (1961-05-01), Fluegel
patent: 3039032 (1962-06-01), Fowler
patent: 3182385 (1965-05-01), Esposito
patent: 3713139 (1973-01-01), Sanford et al.
patent: 4445110 (1984-04-01), Breslow
patent: 4680466 (1987-07-01), Kuwahara et al.

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