  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.
