![]() Interestingly, for intersected particles of large image diameter, ring-shaped particle images show a slightly improved detectability compared to particle images of Gaussian and plateau shape. The detectability is similar for all three particle image shapes as long as particles do not intersect with the interrogation window border. This is also true for large particle image diameters when particle images are intersected at interrogation window borders or when different values of nonzero particle image displacements are considered. they assume a reduced displacement estimation error for noisy as well as for noise-free image data, compared to Gaussian and plateau-shaped particle images. ![]() Monte Carlo simulations of synthetically generated images show that ring-shaped particle images have a superior behaviour, i.e. With increasing image diameter, fully labelled particles are observed to assume plateau-shaped particle images. Such particles are also utilized for the determination of the continuous phase velocities in the experimental part of the present study. Particles of Gaussian image shape result from fully labelled particles with small image diameters and are commonly used in PIV measurements. ![]() In the present study, the influence of the particle image size on the cross-correlation result of such ring-shaped particle images is compared with Gaussian and plateau-shaped particle images. This results in particle images that are transparent in the particle image centre, but fluoresce at the particle image rim, resulting in ring-shaped particle images. Optical accessibility can be achieved by refractive index matching of surface labelled suspension particles. Furthermore, the suspension particle image size can strongly deviate from the optimal particle image size for PIV measurements. are challenging due to reduced optical accessibility. Optical investigations of the dynamics of concentrated suspensions, such as in blood flows (Fitzgibbon et al.
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