Patent ID: 9127924
Filing Date: 2015-09-08
Classification: G01B

Abstract:
1. An interferometer, comprising a light source; a beam splitter adapted to split a first beam of rays, emitted by the light source, into at least one measuring beam and at least one reference beam, to define a first splitting plane, such that the measuring beam propagates in a measuring arm and the reference beam propagates in a reference arm until being recombined at a recombining location in a first recombining plane, the first recombining plane being oriented parallel to the first splitting plane; a measuring reflector arranged in the measuring arm and joined to an object to be measured that is movable along a measuring direction, the measuring reflector being arranged such that the measuring beam falls perpendicularly on the measuring reflector at least twice; a reference retroreflector being arranged in the reference arm, such that the reference beam falls on the reference retroreflector at least once; a detector system adapted to ascertain at least a first distance signal regarding a position of the object to be measured from the interfering measuring and reference beams superposed at the recombining location; a first transparent plane plate and a second transparent plane plate arranged parallel to each other in the beam path between the light source and the detector system, the measuring reflector being movable along the measuring direction relative to the two plane plates; wherein the reference retroreflector is arranged in the first plane plate; and wherein the beam splitter is arranged on the second plane plate.