1. Ambiguity-free spectral-domain optical coherence tomography for determining the layer thicknesses in fluttering foils in real time

    Ambiguity-free spectral-domain optical coherence tomography for determining the layer thicknesses in fluttering foils in real time

    When imaging thick or axially moving samples with spectral-domain optical coherence tomography, mirror terms overlapping with the signals of interest can cause ambiguities. These ambiguities complicate the analysis of the imaged structures and are especially troublesome for processes in which sample parameters have to be monitored in a fully automated way and in real time. In this study we focus on a purely hardware-based approach to overcome this problem. The method is based on shifting and shaping the sensitivity profile by spatially separating the two interferometer beams on the diffraction grating in the spectrometer. The usefulness of the approach, including ...

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