Abstract
In the previous letter a new method for noninvasive measurement of 2-D velocity field of steady flows has been proposed and the effectiveness was confirmed by computer simulation. It uses multiple line detectors and high order correlation analysis.
In this paper, a concrete system which uses 4.5MHz ultrasonic beams as the line detectors is shown.
Experiments were carried out for the following three types of flow fields in a water tank; 1) straight streams, 2) curved streams and 3) continuous wide flow. The stream was generated by passing water through a thin tube. The experimental results showed clearly the usefulness of the proposed method.
The relations between the patterns in the high order correlation function spaces and the characteristics of the flow are also shown.
