Schallabsorptionsmessgerät Messung Schallabsorptionsgrad in situ

Sound absorption meter AcoustiAdrienne

The sound absorption meter AcoustiAdrienne serves the nondestructive measurement of the sound absorption, sound reflection, sound insulation and the sound diffraction of a noise barrier at a road or a railway on the basis of the Adrienne method described in DIN EN 1793-4 and DIN EN 16272-4, DIN EN 1793-5 and DIN EN 16272‑5 as well as DIN EN 1793-6 and DIN EN 16272-6.

By means of an adapter, the sound absorption coefficient of a road surface according to DIN ISO 13472-1 in situ as well as the sound absorption coefficient of a noise barrier according to DIN CEN/TS 1793‑5 and DIN CEN/TS 16272-5 can be determined nondestructively.

On the basis of the measuring results, the sound reflection of noise barriers can be rated according to ZTV Lsw 22 (for non-reverberant situations). Furthermore, the rated sound absorption coefficient according to DIN EN ISO 11654 of a wall absorber or ceiling absorber being installed in a room can be estimated as well.

Download Brochure »

Fields of Application of sound absorption meter

The sound absorption meter AcoustiAdrienne supported by the analysis software AcoustiStudio (Module Sound Reflection In situ) serves the nondestructive measurement of

sound reflection (sound reflection index and sound absorption coefficient) of a noise barrier / a sound screen in situ on the basis of the Adrienne method described in DIN EN 1793-5 and DIN EN 16272-5.

An extension of the sound absorption meter additionally allows the measurement of

the transmission loss (sound insulation index) of a noise barrier / a sound screen in situ according to DIN EN 1793-6 and DIN EN 16272-6 (Module Sound Insulation In situ) as well as
the sound diffraction (sound diffraction index, Miller index) at a noise barrier with crown elements according to DIN EN 1793-4 and DIN EN 16272-4 (Module Sound Diffraction In situ)

on-site. By means of an adapter, also

the sound absorption coefficient of a road surface in situ according to DIN ISO 13472-1 as well as
the sound absorption (sound reflection index and sound absorption coefficient) of a noise barrier / a sound screen according to DIN CEN/TS 1793-5 and DIN CEN/TS 16272-5 (Module Sound Absorption In situ)

can be determined in situ. Furthermore, the method is suitable to nondestructively measure

the sound absorption coefficient of a sound absorber being installed in a room in order to reduce its reverberation time (e.g. wall absorber, ceiling absorber)

as well.

In contrast to the operation of the impedance tube AcoustiTube^®, the sound absorption coefficient cannot only be determined for perpendicular sound incidence, but also for statistical sound incidence.

By applying a specific model to consider the effect of sound diffraction at edges, these results can be compared to measurement results gained in the reverberation chamber according to DIN EN ISO 354.

Principle of sound absorption meter

In order to determine the acoustic properties of sound absorbers in situ, in each case two measurements have to be carried out, one measurement with specimen and on measurement without specimen (free field).

Exemplarily, from the first measurement of a sound absorption test with specimen an impulse response is calculated that contains a direct component, a reflected component of the specimen as well as further reflected components caused by surrounding obstacles. Latter ones can be excluded by application of a time window (Adrienne window). From the second measurement without specimen (free field) an impulse response is calculated that solely contains a direct component. Finally, the sound absorption coefficient and the sound reflection index of the specimen to be characterized can be determined by subtracting both calculated impulse responses from each other.

$Sound absorption meter AcoustiAdrienne for nondestructive measurement of sound absorption coefficient, sound insulation and sound diffraction at noise barriers in situ$