Biospeckle is an interference pattern phenomenon formed by the diffuse reflection of coherent light scattered by any type of activity, biological or not. The interference pattern changes in time due to the movement of the structures that scatter the light. This phenomenon has been studied with the goal of developing a fast and non-destructive method for evaluating biological material. Building a simple model that describes the essential aspects of the phenomenon is an important step towards the development of this technique. In this work is presented a model that describes the formation of the biospeckle, based on simple assumptions about the scattering of coherent light by the biological material and the nature of biological activity. We compare the results provided by the model with experimental biospeckle obtained from seeds. The model reproduces successfully some of the basic characteristics of the dynamical experimental pattern.
speckle; diffraction; fourier optics; biological activity
