8575

Short-time Fourier transform laser Doppler holography

Michael Atlan, Benjamin Samson
Institut Langevin. Centre National de la Recherche Scientifique (CNRS) UMR 7587, Institut National de la Sante et de la Recherche Medicale (INSERM) U 979, Universite Pierre et Marie Curie (UPMC)
HAL : hal-00756281, 2012

@article{atlan2012short,

   title={Short-time Fourier transform laser Doppler holography},

   author={Atlan, M. and Samson, B. and others},

   year={2012}

}

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We report a demonstration of laser Doppler holography at a sustained acquisition rate of 250 Hz on a 1 Megapixel complementary metal-oxide-semiconductor (CMOS) sensor array and image display at 10 Hz frame rate. The holograms are optically acquired in off-axis configuration, with a frequency-shifted reference beam. Wide-field imaging of optical fluctuations in a 250 Hz frequency band is achieved by turning time-domain samplings to the dual domain via short-time temporal Fourier transformation. The measurement band can be positioned freely within the low radio-frequency spectrum by tuning the frequency of the reference beam in real-time. Video-rate image rendering is achieved by streamline image processing with commodity computer graphics hardware. This experimental scheme is validated by a non-contact vibrometry experiment.
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