ABSTRACT
This chapter analyze the quasidynamic model, it is important to know the surface roughness variation corresponding to each speckle pattern. A controlled changing roughness can be simulated using the cell described in the following text and is illustrated in. From the analysis of the experimental results and the curve of that the variation in the roughness in terms of s satisfies. From the fitting parabola, the chapter deduces the following parameters: The values obtained are very reasonable for both roughness and well depth considered in the model. In order to see the validity of this model, compared these results with those given by the variable reluctance instrument. Once the first column is formed, the next step is the construction of the subsequent column considering the time evolution of the speckle. Another contribution proposed improvements in this model in order to consider more general situations, especially those of being free from the focusing condition.
