Abstract
The non-invasive optical measurement technique PIV (particle image velocimetry) is applied to determine the acoustic particle velocity field in an acoustically excited test section for a sinusoidal pure tone. The acoustic particle velocity field is acquired at different phase angles with respect to the excitation frequency, considering a displacement bias. Subsequently, a plane wave decomposition is performed to separate the sound field into a downstream and upstream propagating wave. This allows the calculation of an acoustic reflection coefficient. The results are compared to classical microphone measurements in the same test section showing a good agreement.
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