Patent ID: 6822746
Filing Date: 2004-11-23
Classification: G01B

Abstract:
An interferometric measuring device for measuring a shape of a surface of an object, comprising:a radiation source configured to emit a short-coherent radiation; a beam splitter configured to receive the short-coherent radiation and form an object beam and a reference beam, the object beam directed via an object light path to the object, the reference beam directed via a reference light path; a reflective reference plane and at least one additional reference plane arranged in the reference light path to receive and reflect the reference beam, the at least one additional reference plane corresponding to a quantity of at least one additional surface, the at least one additional reference plane used for producing different optical lengths of the reference light path and for depth scanning; an image converter configured to detect radiation reflected back from the surface and the reference plane and brought into interference, the image converter further configured to detect radiation reflected back from the at least one additional surface and the at least one additional reference plane and brought to interference, the image converter further configured to transmit the detected radiation; and an analyzing device configured to receive the transmitted radiation and to determine a measurement result pertaining to the surface, wherein to determine the measurement result, one of: an optical length of the object light path is altered relative to an optical length of the reference light path; and an intermediate image of at least one of the surface and the at least one additional surface produced in the object light path is scanned.