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|Title:||Heterodyne Speckle Interferometer for Full-field Velocity Profile Measurements of a Vibrating Membrane by Electronic Scanning|
|Authors:||AGUANNO Mauro V.; LAKESTANI FEREYDOUN; WHELAN MAURICE; CONNELLY M.j.|
|Citation:||OPTICS AND LASERS IN ENGINEERING vol. 45 p. 677-683|
|Publisher:||ELSEVIER SCI LTD|
|Type:||Articles in periodicals and books|
|Abstract:||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.|
|JRC Institute:||Institute for Health and Consumer Protection|
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