Reference surfaceHigh-frequency absorber
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: DNA-Tabelle 1968 a 6-1
Value from the PTB table, not verified
Carpet, loop pile, impregnated base fabric, 4.5 mm, 1.87 kg/m², 820 Rayl
PTB reference data
Original description
Carpet, loop pile, impregnated base fabric, 4.5 mm, 1.87 kg/m², 820 Rayl
Material properties
Thickness: 4.5 mm
Surface weight: 1.87 kg/m²
Flow resistance: 820 Rayl
Measurement data
Sound absorption
ISO 354 – reverberation chamber
αw
0.15
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.00 | 0.00 | 0.05 | 0.20 | 0.35 | 0.35 |
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Value from the PTB table, not verified
Measured values as a table (1 measurement)
| Build-up | αw | 100 Hz | 125 Hz | 160 Hz | 200 Hz | 250 Hz | 315 Hz | 400 Hz | 500 Hz | 630 Hz | 800 Hz | 1000 Hz | 1250 Hz | 1600 Hz | 2000 Hz | 2500 Hz | 3150 Hz | 4000 Hz | 5000 Hz | 6300 Hz |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 4,5 mm · 1,87 kg/m^2 · Schlingenwebart | 0.15 | 0.00 | 0.00 | 0.03 | 0.00 | 0.02 | 0.00 | 0.02 | 0.04 | 0.08 | 0.10 | 0.15 | 0.28 | 0.37 | 0.36 | 0.36 | 0.36 | 0.32 | 0.36 | 0.40 |
Measured values as a table (1 measurement)
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