Publications

Extending digital image correlation to moving field of view application: A feasibility study

Miller, Timothy J.; Schreier, Hubert W.; Valley, Michael T.; Brown, Timothy L.

Conventional tracking systems measure time-space-position data and collect imagery to quantify the flight dynamics of tracked targets. However, they do not provide 6-degree-of-freedom measurements combined with spin rate, wobble, and other flight related parameters associated with non-rigid body motions. Using high-speed digital video cameras and image processing techniques, it may be possible to measure test-unit attitude and surface deformations during key portions of the test-unit's trajectory. This paper discusses the viability of applying Digital Image Correlation (DICa) methods to image data collected from two laser tracking systems. Stereo imaging methods have proven effective in the laboratory for quantifying temporally and spatially resolved 3D motions across a target surface. The principle limitations of the DIC method have been the need for clean imagery and fixed camera positions and orientations. However, recent field tests have demonstrated that these limitations can be overcome to provide a new method for quantifying flight dynamics with stereo laser tracking and high-speed video imagery in the presence of atmospheric turbulence. © 2008 Society for Experimental Mechanics Inc.