An optical technique for measuring the velocity of a fluid

Details An optical technique for measuring the velocity of a fluid An optical technique for measuring the velocity of a fluid

Apr 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jmece..17...65k&link_type=abstract

Journal of Mechanical Engineering Science, vol. 17, Apr. 1975, p. 65-70.

Statistics

Applications

Flow Measurement, Optical Measuring Instruments, Refraction, Velocity Measurement, Boundary Layer Flow, Flow Visualization, Laser Applications, Particle Size Distribution, Prisms, Rotating Bodies, Shear Stress, Vortices

Scientific paper

The technique described is based on a refraction phenomenon. Objects observed through a rotating transparent parallel-faced prism have images which move relative to the object. When the objects are small tracer particles suspended in a moving fluid, the velocity of the fluid can be measured by varying the rotational speed of the prism until the component of the image velocity normal to the prism axis is cancelled. The point in space at which the measurement is made is fixed by the intersection of the line of sight of the viewing telescope with a thin transverse beam of light used for illuminating the tracer particles.

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