Speckle interferometry experiments with a digital photocamera

Year: 2004

Authors: Vannoni M., Molesini G.

Autors Affiliation: CNR – Istituto Nazionale di Ottica Applicata, Largo E. Fermi 6, 50125 Firenze, Italy

Abstract: We discuss a simple experiment for detecting small deformations by speckle interferometry. The optical setup uses a laser diode for the source together with a lens to expand the laser beam and a beam splitter dividing the beam and illuminating two scattering surfaces. A low-cost, commercial charge coupled device (CCD) photocamera provides images of the two superimposed speckle fields through the beam splitter. We first take a picture with the system at rest, and then take a second one after a deformation is made in a surface. By simple subtraction of the digital pictures, we obtain a fringe pattern that gives us information about the deformation. (C) 2004 American Association of Physics Teachers.

Journal/Review: AMERICAN JOURNAL OF PHYSICS

Volume: 72 (7)      Pages from: 906  to: 909

KeyWords: charge coupled device (CCD); speckles; interferometry; digital photocamera;
DOI: 10.1119/1.1643375

Citations: 12
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