Abstract
A recent theory of transducer resolution of flow noise (wall pressure fluctuations) at values of ( ωA 1 2 U 0 ) in the approximate range 3 to 100 (where ω is frequency, A is the transducer area and U 0 is the free stream velocity) is used to investigate the effect of transducer size, shape and orientation on flow-noise measurements. It is shown that for a given boundary layer flow the resolution depends strongly only on the transducer face area and the width of the transducer face at right angles to the flow direction.
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