Abstract
A simultaneous 2-D pulsed digital holographic setup that incorporates a rigid endoscope is used to inspect hidden object areas in order to measure microstrains. The system was tested on the internal surface of a harmonically vibrating rectangular metal box with a fracture on its surface. The simultaneous setup allows the acquisition of displacement data from two different object illumination positions at the same time, so that the system is capable of studying nonrepeatable dynamic events. Further analysis using displacement data generates a gradient strain map where the fracture is successfully detected with the corresponding strain magnitude and direction quantified.
Published Version
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