Abstract
A method for measurement of continuous displacements that uses
phase-shifting speckle interferometry is presented. The initial
random phase of the speckle pattern is evaluated by phase shifting
before deformation. The changing phase thereafter is evaluated from
only one image at a time by a least-squares algorithm. The
technique can be used for measuring transients and other dynamic
events, heat expansion as well as other phenomena, for which it is
difficult to accomplish phase shifting during deformation. Theory
along with computer simulations and experimental results are
described.
© 2000 Optical Society of America
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