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Journal of Biomedical Optics

Optoelectronic moiré projector for real-time shape and deformation studies of the tympanic membrane
Author(s): Joris J.J. Dirckx; Willem F. Decraemer
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Paper Abstract

Moiré topography is a valuable technique for studying the shape and deformation of delicate biological structures such as the tympanic membrane. A projection moiré method is described that can produce both shape and deformation fringes in real time, at a rate of 25 interferograms per second. The apparatus is based on electronic subtraction of the projected grating line image of the object and a reference grating line image stored in digital memory. The image field and fringe plane distance can be adjusted to the object dimensions. Using a fringe plane distance of 82 μm, a precision of 5 μm over a measuring depth of 0.4 mm is demonstrated by measurements on a spherical calibration object. The application to in vitro shape and deformation measurements of the gerbil tympanic membrane is demonstrated.

Paper Details

Date Published: 1 April 1997
PDF: 10 pages
J. Biomed. Opt. 2(2) doi: 10.1117/12.268966
Published in: Journal of Biomedical Optics Volume 2, Issue 2
Show Author Affiliations
Joris J.J. Dirckx, Univ. of Antwerp-RUCA (Belgium)
Willem F. Decraemer, Univ. of Antwerp (Belgium)

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