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1. (WO2017178223) POSITION MEASURING ARRANGEMENT AND METHOD FOR OPERATING A POSITION MEASURING ARRANGEMENT

Pub. No.:    WO/2017/178223    International Application No.:    PCT/EP2017/057252
Publication Date: Fri Oct 20 01:59:59 CEST 2017 International Filing Date: Wed Mar 29 01:59:59 CEST 2017
IPC: G01D 5/347
G01D 5/38
G01B 11/14
Applicants: DR. JOHANNES HEIDENHAIN GMBH
Inventors: HOLZAPFEL, Wolfgang
HUBER, Thomas
KÄLBERER, Thomas
MUSCH, Bernhard
Title: POSITION MEASURING ARRANGEMENT AND METHOD FOR OPERATING A POSITION MEASURING ARRANGEMENT
Abstract:
The present invention relates to a position measuring arrangement and a method for operating same in order to determine the relative position of two objects (1, 2) which are arranged moveable in relation to one another along at least one measurement direction. To this end, provision is made of at least one material measure (10) which is connected to one of the two objects and has at least one measurement gradation (11). Further, provision is made of at least two sensing units (20.1, 20.2) which are connected to the other one of the two objects and which are arranged spaced apart at a sensing distance from the material measure in a distance direction. The sensing units each comprise optical sensing units which serve to form a sensing beam path in order to optically sense the measurement gradation and produce position-dependent sensing signals thereabout. At least one optical compensation element (30) that is introducible into or removable from the sensing beam path is assigned to at least one sensing unit. A modification of the working range, which is provided in relation to the spatial arrangement of sensing unit and material measure and in which the sensing unit can produce position-dependent sensing signals, is effectable by introducing or removing the compensation element (30).