Position measuring apparatus with a subdivision circuit for subd

Details Position measuring apparatus with a subdivision circuit for subd Position measuring apparatus with a subdivision circuit for subd

1989-11-07

1991-11-19

Scott, J. R.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341158, 250563, H03M 134

Patent

active

050669532

ABSTRACT:
In a position measuring apparatus there is provided a subdivision circuit for the subdividing of sinusoidal scanning signals. The subdivision circuit includes rectifier circuits in which the scanning signals are reformed in such a way that over a total signal period one rectified signal always has a greater signal value than the other rectified signal. The rectified signal with the greater signal value lies on one reference input and the other rectified signal lies on the other reference input of an analog-to-digital converter. The analog-to-digital converter forms from these rectified signals a binary word which is fed to a correction arrangement. Together with code signals which define four equal sections of a single period, the correction arrangement generates a data word which represents intermediate values of a signal period of the scanning signals.

REFERENCES:
patent: 4594579 (1986-06-01), Schmitt et al.
patent: 4595991 (1986-06-01), Spies
patent: 4760280 (1988-08-01), Schwefel et al.
Ein Laser Interferometer zur photoelektrischen Bewegungsfernmessung in beiden Lateralkoordinaten, Von der Fakultat fur Maschinenwesen der Universitet Hannover nur Erlangung des akademischen Grades, Doktor-Ingenieur genehmigte Dissertation, von Dipl-Phys. Gerd Ulbers, geb am 1.3.1949 in Oldenburg, 1981.
"Halbleiter-Schaltungstechnik", Tietze et al., Spring-Verlog Berlin Heidelberg New York London Paris Tokyo 1986, pp. 762, 786-791.

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