Abstract

We describe a high-resolution white-light speckle photographic technique for the study of in-plane displacements of large flat objects (linear dimension of the order of 1 m). The specklegrams are obtained with a 4 × 4-in. custom-made camera fitted with a high-performance lens and operating at a magnification ratio of 1:20. The object is covered with a retro-reflective paint containing catadioptric glass spheres of ~50 μm in diameter.

© 1982 Optical Society of America