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🔇 Sound Absorption Coefficient Calculator
Calculate sound absorption coefficients and acoustic properties of materials
📐 Absorption Coefficient Formulas
α = (I_incident - I_reflected) / I_incident
α = 1 - R² = 1 - |Z - Z₀|²/|Z + Z₀|²
NRC = (α₂₅₀ + α₅₀₀ + α₁₀₀₀ + α₂₀₀₀) / 4
Total Absorption = S₁α₁ + S₂α₂ + ... + Sₙαₙ
α = absorption coefficient, I = intensity, R = reflection coefficient, Z = impedance, NRC = Noise Reduction Coefficient
Absorption Coefficient:
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Reflection Coefficient:
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Transmission Loss:
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Material Rating:
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💡 Tips & Information
- α = 0: Perfect reflector, α = 1: Perfect absorber
- NRC ranges from 0.0 (no absorption) to 1.0 (perfect absorption)
- Thicker materials generally have better low-frequency absorption
- Porous materials absorb high frequencies better
- Used in acoustic design for noise control