Research Papers: Sensing

Single-beam, dual-view digital holographic interferometry for biomechanical strain measurements of biological objects

[+] Author Affiliations
Dejan V. Pantelić

University of Belgrade, Institute of Physics, Pregrevica 118, Zemun 11080, Belgrade, Serbia

Dušan Ž. Grujić

University of Belgrade, Institute of Physics, Pregrevica 118, Zemun 11080, Belgrade, Serbia

Darko M. Vasiljević

University of Belgrade, Institute of Physics, Pregrevica 118, Zemun 11080, Belgrade, Serbia

J. Biomed. Opt. 19(12), 127005 (Dec 17, 2014). doi:10.1117/1.JBO.19.12.127005
History: Received August 27, 2014; Accepted November 10, 2014
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Abstract.  We describe a method for dual-view biomechanical strain measurements of highly asymmetrical biological objects, like teeth or bones. By using a spherical mirror, we were able to simultaneously record a digital hologram of the object itself and the mirror image of its (otherwise invisible) rear side. A single laser beam was sufficient to illuminate both sides of the object, and to provide a reference beam. As a result, the system was mechanically very stable, enabling long exposure times (up to 2 min) without the need for vibration isolation. The setup is simple to construct and adjust, and can be used to interferometrically observe any object that is smaller than the mirror diameter. Parallel data processing on a CUDA-enabled (compute unified device architecture) graphics card was used to reconstruct digital holograms and to further correct image distortion. We used the setup to measure the deformation of a tooth due to mastication forces. The finite-element method was used to compare experimental results and theoretical predictions.

© 2014 Society of Photo-Optical Instrumentation Engineers

Citation

Dejan V. Pantelić ; Dušan Ž. Grujić and Darko M. Vasiljević
"Single-beam, dual-view digital holographic interferometry for biomechanical strain measurements of biological objects", J. Biomed. Opt. 19(12), 127005 (Dec 17, 2014). ; http://dx.doi.org/10.1117/1.JBO.19.12.127005


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