Apparatus for digital angular measurement

Details Apparatus for digital angular measurement Apparatus for digital angular measurement

1984-02-29

1986-11-18

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237G, G01D 534

Patent

active

046237909

ABSTRACT:
In an apparatus for the digital measurement of an angle means are provided for a course and a fine measurement. For the course measurement, full intervals of a generated periodical signal are counted, and for the fine measurement, a reference mark is provided within the periodical signals. For this purpose, legs of the angle to be measured are defined by two parts e.g. a stator and a rotor which are rotatably mounted with respect to one another about a common axis or shaft. A disk rotating at a constant angular velocity about the same axis, with constant angular velocity supports a circular graduation made up of equidistant radial lines or sectors and gaps. Lines and gaps are sensed by appropriate sensor or pick-up elements. The above said reference mark is realized by disturbing the line width. One edge of all the scale divisions still represents an undisturbed equidistant division extending over the entire disk circle and which is used for course phase measurement. The mark disturbance only consists of a displacement of the other edge and is used for fine measurement.

REFERENCES:
patent: 4224603 (1980-09-01), Lallemand
patent: 4233592 (1980-11-01), Leichle

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