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Reflection, Refraction, and Diffraction

Reflection, Refraction, and Diffraction. Quiz 2. For a oint sound source , If you measure a sound level I 1 = 60 dB at distance d1 = 3 m then at distance d 2 = 5 m the inverse square law predicts a sound level I 2 = dB. The answer:.

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Reflection, Refraction, and Diffraction

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  1. Reflection, Refraction, and Diffraction

  2. Quiz 2 • For a oint sound source , If you measure a sound level I1 = 60 dB at distance d1 = 3 m then at distance d2 = 5 m the inverse square law predicts a sound levelI2 = dB

  3. The answer:

  4. Reflection, Refraction, absorption, and Diffraction

  5. Diffraction

  6. Diffraction

  7. Difusion

  8. Sound Reflection

  9. The Law of Reflection • The law of reflection states that when a ray of light reflects off a surface, the angle of incidence is equal to the angle of reflection.

  10. Early First-Reflected Sound

  11. Curved Reflectors If a curved surface is used to reflect waves, they can be focused onto a point. The diagrams below show both a spherical and parabolic mirror shape

  12. Reflection material

  13. Ray tracing diagram

  14. Oblique reflector:

  15. Non-plane reflector

  16. Acoustical device design • Limit of perceptibility: حد الإدراك • SB+BE-SE ≤17m يتم تصميم العواكس بحيث لا يتجاوز فرق المسار بين الصوت المباشر والصوت المنعكس حد الإدراك

  17. X › 4λ If , λ1000Hz =34cm, Then the reflected surface have not be less than : 4λ=136cm

  18. Echo of sound1- corner echo

  19. Focusing echo

  20. Sound shading

  21. Acoustic shadow

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