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Originalveröffentlichung
DOI: 10.1088/0957-0233/26/1/015302
Web of Science
Zitationen: 10

Tracking errors in 2D multiple particle tracking microrheology

Kowalczyk, Anne; Oelschlaeger, Claude; Willenbacher, Norbert

Abstract:
Tracking errors due to particles moving in and out of the focal plane are a fundamental problem of multiple particle tracking microrheology. Here, we present a new approach to treat these errors so that a statistically significant number of particle trajectories with reasonable length are received, which is important for an unbiased analysis of multiple particle tracking data from inhomogeneous fluids. Starting from Crocker and Grier's tracking algorithm, we identify particle displacements between subsequent images as artificial jumps; if this displacement deviates more than four standard deviations from the mean value, trajectories are terminated at such positions. In a further processing step, trajectories separated by a time gap Delta tau(max) are merged based on an adaptive search radius criterion accounting for individual particle mobility. For a series of Newtonian fluids covering the viscosity range 6-1300 mPa s, this approach yields the correct viscosity but also results in a viscosity-independent number of trajectories equal to the average number of particles in an image with a minimum length covering at least two orders of ... mehr


Zugehörige Institution(en) am KIT Institut für Mechanische Verfahrenstechnik und Mechanik (MVM)
Publikationstyp Zeitschriftenaufsatz
Jahr 2015
Sprache Englisch
Identifikator ISSN: 0957-0233
KITopen ID: 1000050587
Erschienen in Measurement Science and Technology
Band 26
Heft 1
Seiten 015302
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