Micro‐/Nano‐Speckle Method with Applications to Materials, Tissue Engineering and Heart Mechanics

Using a random speckle pattern as a quantitative transducer for displacement and deformation measurement constitutes a major milestone in the advancement of experimental mechanics techniques. Heretofore, displacement or strain transducers or gauges utilise regular patterns as the measurement base. It is the dimensional changes of these bases that are converted into displacement/strain information. The speckle method, on the other hand, uses a random array of particles (either physical or virtual) as displacement transducers. The displacement information of a cluster of random particles is obtained either through an optical processing scheme or a numerical algorithm. In this paper the development of the micro‐/nano‐speckle method with various applications is discussed.