Patent ID: 7142310

Claim:
An interferometric measuring device for measuring a surface of an object by depth scanning, the device comprising: a short-coherent light source for emitting light; a beam splitter, the emitted light being guided to the beam splitter, the beam splitter producing an object beam which is directed via an object beam path to the object and a reference beam which is directed via a reference beam path to a reference surface; an image recorder for recording the light reflected back by the object surface and by the reference surface and combined for interference; an evaluation device for determining a surface shape; and at least one active optical element is influenced by at least one of an electrical field and a magnetic field, the optical element being situated in at least one of the object beam path and the reference beam path, the optical element for changing an optical length of an object light path in relation to an optical length of a reference light path for a depth scanning; wherein the at least one active optical element includes a first active optical element situated in one of the object beam path and the reference beam path for changing an optical light path for the depth scanning and a second active optical element situated in another of the object beam path and the reference beam path for at least one of a color error correction and an imaging error correction.