Panoramic stereo DIC-based strain measurement on submerged objects

Abstract

In this paper, we describe a theoretical foundation for and experimental implementation of a novel 360-degree stereo digital image correlation (DIC) method for quantifying shape and deformation of quasi-cylindrical specimens along their full length and around their circumference. The proposed approach has been implemented for in-vitro experiments on arteries immersed within a physiologic solution (PS) that maintains unaltered native biomechanical properties. To this end, we also address the ubiquitous issue of refraction in non-contacting optical measurements on biological samples immersed in PS by developing and contrasting three different approaches for the correction of the refraction error.