The utilization of pulsed lasers in speckle pattern photography (SPP) permits the contactless determination of displacement and rotation velocities, deformation rates, vibration amplitudes and other mechanical properties on nonprepared surfaces of dynamic solid state objects. The scope of efficient usage of dynamic SPP depends on laser parameters as pulse width, pulse energy and distance between pulses and on the character of the object motion. A survey about measurement capabilities and limitations is given including measurement intervals and attainable illumination areas, taking into account recent results from static SPP. Both double-pulse and time-average techniques for nonperiodic processes are refered to.
"Measurement Of Mechanical Properties On Solid State Surfaces By Dynamic Speckle Photography", Proc. SPIE 1033, Trends in Quantum Electronics, (18 May 1989); doi: 10.1117/12.950638; https://doi.org/10.1117/12.950638