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Fig. 7 | Heritage Science

Fig. 7

From: Do Leonardo da Vinci’s drawings, room acoustics and radio astronomy have anything in common?

Fig. 7

a, b Resultant sound pressure of the plane waves with the frequencies f = 1000 Hz and f = 2000 Hz, respectively, incident on a hemispherical reflector with the radius R = 1 m and interfering with the wave that forms the caustic. \(\overline{{{\text{p}}_{{\text{i}}} }}\): amplitude of the incident wave, α : sound absorption coefficient of the reflector. Thin black lines: sound pressure of the resultant wave pres(t,θ) at the points in time t = 0, T/8, 7 T/8 where T = 1/f, at α = 0.9. Green, red and blue lines: amplitude of fluctuations pres,Max(θ) at α = 0.9, α = 0.6 and α = 0, respectively. Due to symmetry, the range 0 ≤ θ ≤ Π/2 is shown. c, d Resultant sound pressure level SPLres (θ) of the interfering waves described above. SPLi: level of the incident wave

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