MEASUREMENT OF ACOUSTIC PARTICLE-VELOCITY USING PARTICLE IMAGE VELOCIMETRY TECHNIQUES

It is shown that the technique of Particle Image Velocimetry can be us ed to measure the acoustic particle velocity in a monotonic sound fiel d. The mathematical forms for the power spectrum and autocorrelation f unctions of the image formed on film by a sinusoidally oscillating see ding particle are derived. An experiment involving a standing wave in a tube was set up, and the method used to measure the acoustic particl e velocity along the tube. This was compared to the form expected from theory, and the measured results were found to agree to within experi mental error.