Heterodyne Speckle Interferometer for Full-field Velocity Profile Measurements of a Vibrating Membrane by Electronic Scanning
Dynamic deformation measurements were carried out by combining full-field speckle interferometry and heterodyne interferometry. A
digital demodulation technique based on the evaluation of the instantaneous frequency have been implemented in the digital signal
processor of a complementary metal-oxide semiconductor (CMOS)-based camera to extract velocity measurements from phase
modulated optical carrier signals. The purpose of this experimental investigation was to demonstrate a full-field laser vibrometer system
that could replace electro-mechanical scanning with electronic scanning within a programmable stand-alone and relatively low-cost
digital camera. Velocity profiles of a vibrating membrane in the order of few microns per second were reconstructed automatically by
performing an electronic scanning of the surface over the image sensor.
AGUANNO Mauro V.;
LAKESTANI Fereydoun;
WHELAN Maurice;
CONNELLY M.J.;
2008-01-08
ELSEVIER SCI LTD
JRC42022
0143-8166,
http://dx.doi.org/10.1016/j.optlaseng.2006.12.001,
https://publications.jrc.ec.europa.eu/repository/handle/JRC42022,
10.1016/j.optlaseng.2006.12.001,
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