Patent ID: 9739598
Date: 2017-08-22
CPC Classifications: G01B

Claim:
1. A device for interferential distance measurement between two objects movable with respect to each other along at least one shifting direction, comprising: at least one light source; at least one splitting element adapted to split a beam of rays emitted by the light source at a splitting location into at least two partial beams that propagate onward at different angles; at least one deflecting element adapted to deflect the partial beams striking it in a direction of a merging location, where the split partial beams are interferingly superimposed and where optical paths of the partial beams between the splitting location and the merging location are adapted such that traversed optical path lengths of the partial beams between the splitting location and the merging location are identical in the event of a change of distance between the two objects; and at least one detector system adapted to detect distance-dependent signals from the superimposed pair of interfering partial beams.