Patent ID: 7889354
Filing Date: 2011-02-15
Classification: G01B

Abstract:
1. A device for an interferometric measuring device, comprising: a first interferometer; and a second interferometer; wherein short coherent radiation is supplied to the first interferometer via a radiation source which is split into two beam components via a first beam splitter; wherein an optical path length in a first beam component is longer than in a second beam component to the effect that an optical path difference is greater than a coherence length of the radiation; wherein before emerging from the first interferometer, the two beam components are recombined and supplied to the second interferometer, which splits the radiation into two additional beam components; wherein optical path lengths of the two additional beam components are different to the effect that the optical path difference registered in the first interferometer is balanced again; wherein the optical path length for respectively one beam component is adjustable in the first and the second interferometer by at least one movable optical component; and wherein the movable optical components are mechanically coupled to one another.