Brinks Hofer Gilson & Lione
Device for filtering of harmonic signal components
 In a device for filtering harmonic signal components which are created during the scanning of a scale graduation by means of at least one scanning graduation, the graduation marking of the scale or the scanning graduation have a definite shift with respect to equidistant spacing intervals. The shift is chosen such that the signal components of the n-th even harmonic are eliminated by virtue of the resulting phase shift while at the same time the phase position for the signal components of the fundamental wave remains constant and thus independent of the scanning site. In particular, the depth of modulation of the fundamental wave is not reduced. 
Dr. Johannes Heidenhain GmbH
G G
G01D G01D
inventional inventional
Wolfgang
Holzapfel