(a) Photograph of two types of laboratory standard microphones and ruler with 1 mm per fine division, (b) sketch showing laboratory standard microphone front cavity and the front cavity depth between the microphone annulus and diaphragm. (Not to scale)
Block diagram of the equipment configuration that forms the coupling cavity used during plane-wave coupler microphone calibrations of laboratory standard microphones showing the relationship between the microphone front cavity depths and the coupling cavity length. (Not to scale)
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