Advances in light microscope stereo vision |
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Authors: | H W Schreier D Garcia M A Sutton |
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Institution: | (1) Ecole Mines des Albi in France, France;(2) Department of Mechanical Engineering, University of South Carolina, 300 Main Street, 29308 Columbia, SC, USA |
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Abstract: | The increasing research focus on small-scale mechanical systems has generated a need for deformation and strain measurement
systems for microscale applications. Optical measurement systems, such as digital image correlation, present an obvious choice
due to their non-contacting nature. However, the transfer of measurement technology developed for macroscale applications
to the microscale presents unique challenges due to the differences in the required highmagnification optics. In this paper
we illustrate the problems involved in calibrating a stereo microscope using traditional techniques and present a novel methodology
for acquiring accurate, three-dimensional surface shape and deformation data on small-scale specimens.
Experimental results demonstrate that stereo microscope systems can be accurately and reliably calibrated using a priori distortion
estimation techniques in combination with traditional bundle-adjustment. The unique feature of the present methodology is
that it does not require a precision calibration target but relies solely on point correspondences obtained by image correlation.
A variety of experiments illustrate the measurement performance of a stereo microscope system. It is shown that the surface
strains obtained from the full-field, three-dimensional measurements on tensile specimens undergoing large rigid-body motions
are within ±50 microstrain of strain gage measurements for strains ranging from 0 to 2000 microstrain.
H. W. Schreier was a PhD Student from Ecole Mines des Albi in France |
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Keywords: | Stereo microscope stereo vision accurate stereo calibration procedure digital image correlation three-dimensional surface displacement measurement |
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