Browsing by Author "Cusato, Leslie"

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    Extending low-coherence interferometry dynamic range using heterodyne detection
    (2020-08) Cusato, Leslie; Cerrotta, Santiago; Torga, Jorge Román; Morel, Eneas Nicolás
    Low-coherence interferometry (LCI) technique is generating considerable interest in industrial applications where there is a need for larger measurements with high resolution. Conventional Fourier domain systems reach a limiting depth of around 3 mm, mainly due to the spectrometers used as detectors. In this work, we present an optical detection system that performs the Fourier transform of the LCI signals, based on a spatial heterodyne spectrometer. This device avoids the fall-off effect of the spectrometer, allowing to reach measurable optical depths of almost 5 cm without losing resolution. We describe the theory underlying this detection system and present experimental results which are in great accordance.
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    Preliminary study of a heterodyne detection system for optical coherence tomography signals
    (2019-10-24) Cusato, Leslie; Morel, Eneas Nicolás; Torga, Jorge Román
    A heterodyne detection system for optical coherence tomography signalsis presented and characterized. The system allows to expand the range of measurement and overcome the limitations of conventional systems which typically uses a spectrometer as a detector.