Differential Dynamic Microscopy (DDM) analyzes traditional real-space microscope images to extract information on sample dynamics in a way akin to light scattering, by decomposing each image in a sequence into Fourier modes, and evaluating their time correlation properties. DDM has been applied in a number of soft-matter and colloidal systems. However, objects observed to move out of the microscope’s captured field of view, intersecting the edges of the acquired images, can introduce spurious but significant errors in the subsequent analysis. Here we show that application of a spatial windowing filter to images in a sequence before they enter the standard DDM analysis can reduce these artifacts substantially. Moreover, windowing can increase significantly the accessible range of wave vectors probed by DDM, and may further yield unexpected information, such as the size polydispersity of a colloidal suspension. Graphical abstract: [Figure not available: see fulltext.].

Image windowing mitigates edge effects in Differential Dynamic Microscopy / F. Giavazzi, P. Edera, P..J. Lu, R. Cerbino. - In: THE EUROPEAN PHYSICAL JOURNAL. E, SOFT MATTER. - ISSN 1292-8941. - 40:11(2017 Nov 09), pp. 97.1-97.9. [10.1140/epje/i2017-11587-3]

Image windowing mitigates edge effects in Differential Dynamic Microscopy

F. Giavazzi;P. Edera;R. Cerbino
2017-11-09

Abstract

Differential Dynamic Microscopy (DDM) analyzes traditional real-space microscope images to extract information on sample dynamics in a way akin to light scattering, by decomposing each image in a sequence into Fourier modes, and evaluating their time correlation properties. DDM has been applied in a number of soft-matter and colloidal systems. However, objects observed to move out of the microscope’s captured field of view, intersecting the edges of the acquired images, can introduce spurious but significant errors in the subsequent analysis. Here we show that application of a spatial windowing filter to images in a sequence before they enter the standard DDM analysis can reduce these artifacts substantially. Moreover, windowing can increase significantly the accessible range of wave vectors probed by DDM, and may further yield unexpected information, such as the size polydispersity of a colloidal suspension. Graphical abstract: [Figure not available: see fulltext.].
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Settore FIS/07 - Fisica Applicata(Beni Culturali, Ambientali, Biol.e Medicin)
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Anisotropies and non equilibrium in soft matter: routes to the self assembly of advanced materials
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/531805
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