INVESTIGATION AND APPLICATION OF REVERBERATION MEASUREMENTS IN WATER
Abstract
A method of determining sound absorption coefficients of underwater sound absorbing materials is presented applying reverberation techniques similar to those employed in air. A technique was developed capable of measuring decay rates up to 200,000 db/sec over a limited range of 50 db. Diffusion was obtained by use of a filtered noise source and a suspended air filled balloon, while problems involving methods of averaging coefficients were avoided by treating all surfaces completely with the same absorbent material. Measurement of power through decay rates as proposed by R. W. Young was accomplished and results were compared with those obtained using pulse technique, no consistent agreement could be found.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1962
- Accession Number
- AD0480924
Entities
People
- Eugene W. Vahlkamp
- Richard W. Case
Organizations
- Naval Postgraduate School