Estimating the velocity profile of air flow by means of the ultrasonic translation time computed tomography method

Computed tomography (CT) was used to reconstruct the velocity profile of air flow from the average velocity over some different paths of ultrasonic-wave propagation. The algorithm used reconstructs the function, which is defined on a unit circle and zero outside, by its line integrals over N(N-1)/2 chords connecting any two points of N points equally spaced along the circumference of the circle. An experiment was performed to reconstruct the velocity profile of air flow in a pipe where a motor fan was used as the air source. The number of points N in the experiment was 8. The result was then compared to the value measured by a hot-wire anemometer