Underwater acoustic tank evaluation of acoustic properties of samples using spectrally dense signals

4 pp.-- Comunicación presentada en: Joint Meeting "Berlin 99": 137th regular meeting of the Acoustical Society of America ; 2nd convention of the EAA: Forum Acusticum - integrating the 25th German Acoustics DAGA Conference. Berlin, March 14-19, 1999.This paper deals with exploring the availability and reliability of subtraction techniques, based on spectrally dense signals such as Maximun Length Sequences, in evaluating the echo reduction losses of samples of interest underwater acoustics. These techniques, first employed in air acoustics, were adapted to the underwater environment. Experimental results show how a measurement can be accomplished and the limitations produced by the actual available combination of soft, hardware and tank and sample dimensions.The authors wish to acknowledge the help given by the CICYT, Project AMB97-1175-CO301, for having the opportunity to use the software, hardware and related facilities in carrying out the work described by this paper.Peer reviewe