Materiales de Construcción, Vol 67, No 328 (2017)

Small-sized reverberation chamber for the measurement of sound absorption


https://doi.org/10.3989/mc.2017.07316

R. del Rey
Universitat Politècnica de València, Centre for Physics Technologies: Acoustics, Materials and Astrophysics, Polytechnic School of Gandia, Spain
orcid http://orcid.org/0000-0001-5907-0677

J. Alba
Universitat Politècnica de València, Centre for Physics Technologies: Acoustics, Materials and Astrophysics, Polytechnic School of Gandia, Spain
orcid http://orcid.org/0000-0002-4188-854X

L. Bertó
Universitat Politècnica de València, Centre for Physics Technologies: Acoustics, Materials and Astrophysics, Polytechnic School of Gandia, Spain
orcid http://orcid.org/0000-0002-8328-5595

A. Gregori
Universitat Politècnica de València, Centre for Physics Technologies: Acoustics, Materials and Astrophysics, Polytechnic School of Gandia, Spain
orcid http://orcid.org/0000-0002-4090-0367

Abstract


This paper presents the design, construction, calibration and automation of a reverberation chamber for small samples. A balance has been sought between reducing sample size, to reduce the manufacturing costs of materials, and finding the appropriate volume of the chamber, to obtain reliable values at high and mid frequencies. The small-sized reverberation chamber, that was built, has a volume of 1.12 m3 and allows for the testing of samples of 0.3 m2. By using diffusers, to improve the diffusion degree, and automating measurements, we were able to improve the reliability of the results, thus reducing test errors. Several comparison studies of the measurements of the small-sized reverberation chamber and the standardised reverberation chamber are shown, and a good degree of adjustment can be seen between them, within the range of valid frequencies. This paper presents a small laboratory for comparing samples and making decisions before the manufacturing of larger sizes.

Keywords


Acoustic Properties; Sound Absorption Coefficient; Characterisation

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References


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