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Sampling rate in the dynamic speckle analysis

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Sampling rate in the dynamic speckle analysis

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dc.contributor.author Pujaico Rivera, Fernando
dc.contributor.author González Peña, Rolando de Jesús
dc.contributor.author Braga-Jr, Roberto A.
dc.date.accessioned 2022-10-04T15:04:16Z
dc.date.available 2022-10-04T15:04:16Z
dc.date.issued 2022
dc.identifier.citation Pujaico Rivera, Fernando González Peña, Rolando de Jesús Braga-Jr, Roberto A. 2022 Sampling rate in the dynamic speckle analysis Applied Physics B-Lasers and Optics 128 191 1 8
dc.identifier.uri https://hdl.handle.net/10550/84111
dc.description.abstract Dynamic laser speckle and its biological version (biospeckle laser) have been used in many areas of knowledge. Its noninvasive approach allows the application in advantage regarding those that need contact or damage the analyzed sample. However, one needs the sharp adjust of the image acquiring and processing. In this article, we show how the variation of sampling rate in a dynamic speckle analysis affects the value of dynamic speckle indexes concerning the absolute value of the differences index, the temporal speckle standard deviation index, and the temporal speckle mean index. We show that the dynamic speckle index value changes its maximum excursion with the variation of sampling rate, affected directly by the camera's time integration (time of exposure). We highlight the importance of knowing the frequency band of the analyzed phenomenon and its signal to choose the appropriate sampling rate, with the recommendation of using the lowest sampling rate possible¿without compromise the speckle grains¿to obtain an acceptable maximum excursion and an illumination level with a good signal-noise ratio. The results will help those who work with the phenomenon/technique to enhance their analysis tailoring the set up and yielding reliable results, since the optical method demands a rigorous bias of the image acquiring and processing.
dc.relation.ispartof Applied Physics B-Lasers and Optics, 2022, vol. 128, num. 191, p. 1-8
dc.subject Òptica Aparells i instruments
dc.subject Imatges Processament Tècniques digitals
dc.title Sampling rate in the dynamic speckle analysis
dc.type journal article es_ES
dc.date.updated 2022-10-04T15:04:16Z
dc.identifier.doi 10.1007/s00340-022-07912-w
dc.identifier.idgrec 154776
dc.rights.accessRights open access es_ES

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