Speckle metrology of dynamic macro- and microprocesses in deformable media

Dynamic Speckle Interferometry of Technical and Biological Objects

“…To overcome the drawback named in [32,36,37], the theory was upgraded. The idea consisted in application of the time averaging procedure to speckle dynamics.…”

“…Let us discuss the results of the theoretical studies, first for a reflecting object, and then for a transparent object. In [32], from the model of scattering reflecting object discussed in Section 3.1, a problem concerning speckle dynamics in the image plane of a flat surface performs a complex motion. It was supposed that the scattering centers located in plane (хоу)( Figure 1) simultaneously (1) move at a low rate toward ох axis, (2) perform periodic motions with the same period and amplitude toward ох axis, and (3) randomly move in space.…”

“…The opportunity for application of the elastic deformation control technique that we have discussed was substantiated in [32]. Deformation ε ¼ Δu=ΔX of the 10 À3 order corresponds to values Δu of the 1-nm order and ΔX of the 10-μm order.…”

“…In [32], it was shown that when a 10 Â 10-pixel fragment is selected at the variation of η from 0.3 to 0.99, the ratio error of its determination does not exceed 1%. It was shown that a small error in determination of value η by formula (15) is related to the features of radiation intensityĨ distribution in the speckle pattern.…”

“…We managed to obtain numerical values of x 2 and k 22 for cases k 22 = 0 and x 2 = 0, respectively. In [32], it was proposed to obtain the values of x hi and k 22 by simultaneous recording of two speckle images obtained using two lasers. Development of such a technique can be the subject for further research.…”