Hofer Willian Brinks Gilson & Lione
Interferential position measuring device
 The invention relates to an interference device having a light source, detectors, and at least two diffraction elements with identical or only slightly different diffraction structures, wherein the parameters of the diffraction structures of the diffraction elements vary continuously as a function of location. 
Dr. Johannes Heidenhain GmbH
G G
G01D G01D
inventional inventional
Wolfgang
Holzapfel