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Fig. 5. (A) Impulse response of a hollow hemisphere (r=38.5 mm) for an
angle of sound incidence of 10° (edges, 1st, 2nd to nth
reflections, see text and D). The time gap between first and second reflection
(gap1-2) is marked with a grey bar. (B) Duration of the gap between
first and second reflection plotted over the radius of the hollow hemispheres.
The gaps were measured (black triangles) from the impulse response functions,
and calculated (open squares) from Eqn 2 in the text. (C) Relative amplitude
of the echoes of hollow hemispheres of different sizes measured from an angle
of 10° in a distance of 40 cm (D) Sound reflections within a hollow
hemisphere, for a sound source at infinite distance such that incoming and
outgoing rays are parallel and assuming that wavelength is small in comparison
to the radius.
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