Sampling rate in the dynamic speckle analysis

Abstract Dynamic laser speckle and its biological version (biospeckle laser) have been used in many areas of knowledge. Its non-invasive approach allows the application advantage regarding those that need contact or damage analyzed sample. However, one needs sharp adjust image acquiring processing. In this article, we show how variation sampling rate a dynamic analysis affects value indexes concerning absolute differences index, temporal standard deviation mean index. We index changes maximum excursion with rate, affected directly by camera's time integration (time exposure). highlight importance knowing frequency band phenomenon signal to choose appropriate recommendation using lowest possible—without compromise grains—to obtain an acceptable illumination level good signal–noise ratio. The results will help who work phenomenon/technique enhance their tailoring set up yielding reliable results, since optical method demands rigorous bias