Volume illumination for two-dimensional particle image velocimetry

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Viscous flow through microfabricated hyperbolic contractions (2007, background): “According to Meinhart et al. (2000), the true depth of measurement (dzm) can be calculated as a sum of three components associated with diffraction, geometrical shadow and particle size: dzm ¼ 3nk NA2 þ 2:16dp tan h þ dp; ð4Þ where h is the collection angle of the optical system, h = sin–1 (NA/n).”
The inertio-elastic planar entry flow of low-viscosity elastic fluids in micro-fabricated geometries (2005, methodology): “This value is experimentally verified in [44].”
High-Speed Photography and Digital Optical Measurement Techniques for Geomaterials: Fundamentals and Applications (2017, methodology): “A light sheet is not applicable but a volume illumination mode was employed, which is usually used for three-dimensional (3D) velocity measurements (Willert and Gharib 1992) and a micro-PIV measurement (Meinhart et al. 2000).”
Optically sliced micro-PIV using confocal laser scanning microscopy (CLSM) (2004, background): “…of the 8The background noise from the off-focus particle images can be reduced to an acceptable level by limiting the PIV measurement depth to a base-cut level where the field-wide-averaged image intensity reaches one-tenth of the maximum in-focus image intensity (Meinhart et al. 2000).”