High-Speed Digital Image Correlation for Endoscopy: A Feasibility Study
Endoscopes are imaging tools utilized to observe objects in confined volumes. However, endoscopic imaging is qualitative, and only specific methods allow corresponding quantitative imaging under such conditions. This paper reports our progress in incorporating endoscopic imaging with digital image correlation (DIC) to perform high-speed quantitative measurements of shapes and displacements. A high-speed camera with a maximum framerate of two million per second is set up in an endoscopic configuration for 2D DIC measurements. Measurements are first verified against the displacements of a manual translation with a micrometer resolution. Then the system is applied in order to study the transient response of a piezoelectric actuator via step response. These results allow for the characterization and identification of the measuring challenges observed when performing high-speed endoscopic DIC. In addition, this study explores the potential of incorporating endoscopes into DIC imaging systems and providing the preliminary testing parameters of future optical designs for both biological and industrial applications.
KeywordsEndoscopy High-speed digital image correlation PZT Optical design
This work has been supported by National Institute on Deafness and other Communications Disorders (NIDCD) and has been partially supported by NSF award CMMI-1428921. We would also like to gratefully acknowledge the support of the Mechanical Engineering Department at the Worcester Polytechnic Institute (WPI) and the contributions by other members of the CHSLT and MEE.
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