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Ĭierpka C, Hain R, Buchmann NA (2016) Flow visualization by mobile phone cameras. J Signal Inf Process 2:59īrevis W, Niño Y, Jirka G (2011) Integrating cross-correlation and relaxation algorithms for particle tracking velocimetry. US Patent US3971065īendicks C, Tarlet D, Roloff C et al (2011) Improved 3-D particle tracking velocimetry with colored particles. Sci Rep 7:3714īayer B (1976) Color imaging array. Īguirre-Pablo AA, Alarfaj MK, Li EQ, Hernández-Sánchez JF, Thoroddsen ST (2017) Tomographic particle image velocimetry using smartphones and colored shadows. Apart from a pulse-and-delay generator, the overall system cost is very low.Īdamczyk AA, Rimai L (1988) 2-Dimensional particle tracking velocimetry (PTV): technique and image processing algorithms. Because of the shadowgraphic arrangement, long path lengths through scattering media lower image contrast, while visualization of phase boundaries with high resolution is a strength of this method. Three example flows are presented, solid particles suspended in water, the penetrating front of a gasoline direct-injection spray, and the liquid break-up region of an “air-assisted” nozzle.
#TAJIMA PULSE SEPARATING SAME COLOR SEQUENCE SERIES#
Color reversal and color cross-talk correction yield a series of three frozen-flow images that can be used for further analysis, e.g., determining the droplet velocity by particle tracking.
In a backlit configuration, liquid droplets appear as shadows in each color channel. The LED emits a sequence of short light pulses, red, green, then blue (RGB), and through its color-filter array, the camera captures all three pulses on a single RGB frame. This work demonstrates the application of a multi-color LED and a consumer color camera for visualizing phase boundaries in two-phase flows, in particular for particle tracking velocimetry.
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