Method and apparatus for interferometry
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United States of America Patent
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Dec 10, 2013
Grant Date -
Sep 29, 2011
app pub date -
Oct 12, 2009
filing date -
Oct 10, 2008
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Abstract
A method and an arrangement are provided for scalable confocal interferometry for distance measurement, for 3-D detection of an object, for Optical Coherence Tomography (OCT) tomography with an object imaging interferometer and at least one light source. The interferometer has an optical path difference not equal to zero at each optically detected object element. Thus, the maxima of a sinusoidal frequency wavelet, associated with each detected object element, each have a frequency difference Δf_Object. At least one spectrally integrally detecting, rastered detector is arranged to record the object. The light source preferably has a frequency comb, and the frequency comb differences Δf_Source are changed in a predefined manner over time in a scan during measuring. In the process, the frequency differences Δf_Source are made equal to the frequency difference Δf_Object or equal to an integer multiple of the frequency differences Δf_Object at least once for each object element.
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