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2 November 2011 Measurements of the tympanic membrane with digital holographic interferometry
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In this paper a digital holographic interferometry (DHI) system with three object-illumination beams is used for the first time to detect and measure micrometer deformations on the surface of a tympanic membrane. Using this optical setup allows all three object displacement components x, y, and z, to be independently calculated. The corresponding deformations are registered using a cw laser in stroboscopic mode and a CCD camera synchronized to the excitation acoustic wave that produces a resonant vibration mode on the tympanic membrane surface. A series of digital holographic interferograms record the displacements undergone by the tympanic membrane and from them full field deformation phase maps are obtained. From the latter it is possible to observe the displacement of the tympanic membrane in response to the sound pressure. The study was performed on the tympanic membrane taken from a post-mortem cat. The results show the feasibility to apply a similar optomechanical arrangement for the study in humans, representing an alternative technique for the study of pathologies in the tympanic membrane.
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S. Muñoz Solís, F. Mendoza Santoyo, and M. del Socorro Hernández-Montes "Measurements of the tympanic membrane with digital holographic interferometry", Proc. SPIE 8011, 22nd Congress of the International Commission for Optics: Light for the Development of the World, 80118A (2 November 2011);

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