Geometrical instruments – Distance measuring – Scale reading position sensor
Patent
1997-12-15
2000-02-01
Gibson, Randy W.
Geometrical instruments
Distance measuring
Scale reading position sensor
33708, 32420724, G01B 714, A45B 308
Patent
active
060188812
ABSTRACT:
A position measuring system that includes a scale graduation and a scanning element, wherein the scanning element moves relative to the scale graduation along a measurement direction so as to generate position-dependent, intensity-modulated output signals. The scanning element includes a dynamic characteristic, which has saturation areas adjoining both sides of an at least partially approximately linear operating area, in which no significantly changed output signal results any more, even when the input signal changes. The scanning gap (d) between the scale graduation and the scanning element is selected in such a way that as the scanning element moves over its entire measurement range a modulation between maximum input signals, which are located in the saturation areas of the dynamic characteristic, takes place. In order to eliminate the distortions of the output signals which usually occur in this modulation area it is furthermore provided to perform signal filtering in order to remove, in particular, the third harmonic from the output signal.
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Dr. Johannes Heidenhain GmbH
Gibson Randy W.
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