Patent ID: 7170610
Filing Date: 2007-01-30
Classification: G01B,G01N

Abstract:
1. Low-coherence interferometric apparatus for light-optical scanning of an object ( 18 ), by detecting the position of light-remitting sites ( 20 ) which are located along a scan path ( 27 ) running in a scan direction ( 28 ), with a low-coherence interferometer ( 6 ) comprising a low-coherent light source ( 7 ), a reference reflector ( 21 ) and a detector ( 25 ), wherein light emitted from the light source ( the adjustable scan position is varied along the scan path ( the measurement light ( characterized in that a variable wavelength selection device ( 30 ) is positioned in the light path of the detection light between the beam junction ( 10 ) and the detector ( 25 ), by which a wavelength-dependent separation of the detection light ( 24 ) is performed in such a manner that the detector ( 25 ) selectively receives preferably light with wavelengths which correspond to a predetermined sequence of wavenumbers k, and different sequences of wavenumbers k can be set for varying the scan position along the scan path ( 27 ).