Short-time Fourier transform laser Doppler holography
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}
}
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.
November 28, 2012 by hgpu
