Patent ID: 7339679

Claim:
An interferometric measuring device for recording at least one of a shape, a roughness and a separation distance of a surface of a measuring object, comprising: a modulating interferometer for receiving short-coherent radiation by a radiation source, and having a first beam splitter for splitting supplied radiation into a first beam component guided via a first arm, and into a second beam component guided via a second arm, one of which is shifted with respect to the other in one of its light phase and light frequency with a modulating device and passes through a delay line, and which are subsequently combined at an additional beam splitter of the modulating interferometer; a measuring probe spatially separated from the modulating interferometer and at least couplable to it via a light-conducting fiber arrangement, in which the combined beam components are split in a common arm in a partially transmitting region into a measuring beam and a reference beam, and in which the measuring beam reflected at the surface and the reference beam reflected at a reference plane are superposed; and a receiver device and an evaluating device for converting the radiation supplied to it into electrical signals and for evaluating the signals based on the phase difference; wherein the partially transmitting region is formed by a slanting exit face of a probe fiber at an exit angle with respect to an optical probe axis and a likewise slanting entrance face of a fiber section following on the object side, with respect to the optical probe axis at an entrance angle, a wedge-shaped gap being formed between the exit face and the entrance face.