Deformation measurements of the human tympanic membrane under static pressure using automated moire topography

Joris J.J. Dirckx; Willem F. Decraemer

doi:10.1117/12.44653

1 August 1991 Deformation measurements of the human tympanic membrane under static pressure using automated moire topography

Joris J.J. Dirckx, Willem F. Decraemer

Author Affiliations +

Proceedings Volume 1429, Holography, Interferometry, and Optical Pattern Recognition in Biomedicine; (1991) https://doi.org/10.1117/12.44653
Event: Optics, Electro-Optics, and Laser Applications in Science and Engineering, 1991, Los Angeles, CA, United States

Abstract

To measure the surface shape and shape change of soft biological material, the use of a noncontacting metrological technique is imperative. One of these techniques is moire contouring, which is particularly interesting because of its simplicity and low cost. We propose a method to mathematically reconstruct a surface shape from moire topograms. The method is based on the recording of three topograms which are shifted in phase by translating the object. The method is implemented in an apparatus which fully automatically performs all required steps to finally yield a 512 by 512 point matrix of surface height values, with a height measuring resolution of 20 micrometers . The resolution for measuring small height displacements is 2 micrometers . Due to this high resolution, it is possible to investigate the deformation of the tympanic membrane, caused by small pressure changes in the middle ear cavity. Full field deformation data are shown. The data can be used to obtain information on the movement of the manubrium, or to calculate volume displacements and surface area changes.

Citation Download Citation

Joris J.J. Dirckx and Willem F. Decraemer "Deformation measurements of the human tympanic membrane under static pressure using automated moire topography", Proc. SPIE 1429, Holography, Interferometry, and Optical Pattern Recognition in Biomedicine, (1 August 1991); https://doi.org/10.1117/12.44653

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