Abstract
We used the phase-stepping shearography technique to detect blind holes of various sizes and depths in a Plexiglas (PMMA or polymethyl methacrylate) plastic block. The block was strongly heated (raising the temperature by about 80C) from the back side by a low-cost infrared heater, and then cooled by convective cooling. Hole sizes down to 10 mm diameter and 15 mm remaining thickness (depth) were quickly detected from the other (blind) side during heating. The temperature profiles at different places on the block were monitored as functions of time for heating and cooling. The method, that exploits high spatial resolution of a digital still camera, suggests the detection of strain abnormalities by non-destructive testing of plastic components.
Published Version
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