Abstract
In spatially resolving the fluctuating pressure on a wall (e.g., a wall adjacent to an aerodynamic boundary layer), a small hole in the wall leading to a microphone recessed in a cavity is equivalent to a rigid microphone whose sensitivity varies over its face in the same way as the normal efflux velocity that would result (at the actual opening in the wall) if a source were placed at the location of the microphone in the cavity. The wall may be curved and compliant.
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