Article ID Journal Published Year Pages File Type
735886 Optics and Lasers in Engineering 2009 9 Pages PDF
Abstract

Computer modeling of middle ear mechanics is an important tool to investigate its complex behavior, but correct mechanical and elastic parameters are needed to obtain realistic simulations. A possible way to determine eardrum elasticity in situ is the use of point indentation measurements. The eardrum is, however, a small fragile membrane, so a non-contacting high-resolution technique is needed to measure the shape change caused by point indentation. We have developed a projection moiré interferometer combined with an indentation actuator and a high-resolution force sensor. The apparatus applies deformations up to 1 mm with a resolution of 1μm, while the indentation force is measured with a resolution better than 1 mN. The moiré setup delivers height data on 512×512512×512 points through phase-shifting, with a height resolution of 15μm. Shape recordings are made on a rabbit eardrum at different indentation distances, and indentation force is recorded simultaneously.

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Physical Sciences and Engineering Engineering Electrical and Electronic Engineering
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