The paper presents a completely new measurement technique for the sound absorption properties of materials, based on the measurements of active intensity and sound energy density. The technique allows one to measure the absorption coefficient with a wide-band excitation, to use frequency bands of any width, and to make measurements both inside a tube or in situ. The intensity technique is compared to the transfer function method (as defined in the ASTM E-1050 Standard) by means of a complete theoretical study and large experimental validation. The results suggest that the new method is at least as accurate and reliable as the ASTM E-1050 Standard. The method also has many advantages: it is faster and easier, it directly produces results in one-third or 1-octave bands, and it can be implemented with portable, low-cost instrumentation.

Authors: Farina, Angelo; Torelli, A.
Affiliations: Dipartimento Ingegneria Industriale, University of Parma, Parma, Italy ; Audio Link Snc, Alberi, Italy(See document for exact affiliation information.)
AES Convention: 102 (March 1997) Paper Number: 4409
Publication Date: March 1, 1997
Subject: Measuring and Modeling

Click to purchase paper as a non-member or you can login as an AES member to see more options.

No AES members have commented on this paper yet.

Subscribe to this discussion

To be notified of new comments on this paper you can subscribe to this RSS feed. Forum users should login to see additional options.

Start a discussion!

If you would like to start a discussion about this paper and are an AES member then you can login here:
Username:
Password:

If you are not yet an AES member and have something important to say about this paper then we urge you to join the AES today and make your voice heard. You can join online today by clicking here.