Abstract
When a laser-illuminated diffuse surface undergoes displacement and/or deformation, the speckles appearing in the scattered field or in its image show displacement accompanied by change in structure. Because of the high contrast of laser speckles, speckle displacement can be easily observed everywhere in space. It is not, however, uniform in space but shows remarkable dependence on observation position and on the optical system as well as on object deformation. The purpose of this chapter is to discuss these dynamic behaviors theoretically and to describe several methods for detection of speckle displacement. Then we discuss the application of speckle displacement to the measurement of surface displacement, strain, and velocity.
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