Patent ID: 9080857
Filing Date: 2015-07-14
Classification: G01B,G01D

Abstract:
1. A device for interferential distance measurement, comprising: a light source that emits a light beam along a propagation direction; a scanning plate comprising a splitter that splits said light beam into a measurement beam and a reference beam; a reflector disposed spaced-apart in a direction of said propagation direction, wherein said reflector is embodied as a plane mirror and is movable with respect to said scanning plate along an axis which is perpendicular to a surface of said reflector; a detector element, wherein said measurement beam and said reference beam are propagated from said splitter along different optical paths toward said reflector, where a back reflection of said measurement beam and said reference beam occurs at said surface of said reflector toward said scanning plate, and wherein at a combining location said measurement beam and said reference beam attain interfering superposition, and wherein said measurement beam and said reference beam interfering at said combining location are detected by said detector element so that said detector element generates a distance signal regarding a distance between said scanning plate and said reflector along said axis; and a signal processing unit that has a structure to receive said distance signal from said detector element and determine said distance based on said distance signal.