Patent ID: 6934027

Claim:
An interferometric measuring device for measuring a shape of a surface of an object, comprising: a radiation source that emits a short-coherent radiation; a beam splitter for forming an object beam which is directed via an object light path to the object, and a reference beam which is directed via a reference light path to a reflective reference plane; an image converter for detecting a radiation reflected back by the surface and the reference plane and brought to interference, and for transmitting the radiation; an analyzing device for receiving the radiation transmitted from the image converter and for determining a measuring result pertaining to the surface, wherein an optical length of the object light path is altered relative to an optical length of the reference light path to perform a measurement; and a superposition optics positioned in the object light path and including one of multifocal optics and a free segment optics having imaging elements, the superposition optics creating an image simultaneously other than of the surface, of at least one additional surface, the image of the at least one additional surface and the image of the surface being imaged on the image converter one of directly and via at least one intermediate image in the object light path, wherein a measurement of the surface and a measurement of the at least one additional surface occurs accompanied by a relative change in the optical length of the object light path as compared to the optical length of the reference light path.