Abstract
The present study focuses on the AA-PSP response to a periodic change in pressure. The periodic change in pressure is produced by mounting a rectangular cavity on the duct in which air flows at a Mach number of 〜0.8. The pressure oscillation frequency is ranged from 4 to 14 kHz by changing the cavity length. The phase delay in the pressure measured by the AA-PSP is estimated by calculating the cross-correlation between two pressure signals measured by the AA-PSP and semiconductor-type pressure transducer. The effect of coating thickness is investigated by testing two AA-PSPs having different coating thicknesses of 4 μm and 29 μm. As a result, the phase delay is close to zero over the entire range of frequency tested for the AA-PSP with the 4 μm coating, while the phase delay increases with frequency for that with the 29 μm coating.
