Abstract
Methods of inserting and photographing tracers in an air stream are described. Successive positions of micrometer-sized oil drops are determined in centimeter-sized fields of a low power microscope by triple flash illumination at known intervals of 10 to 500 microseconds. Tracer positions read from the picture are entered into a computer and velocities calculated throughout the field. Some examples of computer displays of velocity fields are presented.
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Emrich, R.J. Flow field measurement by tracer photography. Experiments in Fluids 1, 179–184 (1983). https://doi.org/10.1007/BF00266465
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DOI: https://doi.org/10.1007/BF00266465