Title
Niet-lineaire akoestiek
Author
Physisch Laboratorium TNO
Rijnja, H.A.J.
Publication year
1977
Abstract
Because the speed of sound under water depends on the pressure, a sinusoidal pressure wave with a high amplitude will be distorted while it propagates through the water. When two strong sound waves with different frequencies ìnteract, mutual modulation occurs, causing sum- and difference frequencies. Because the absorption of sound energy under water is higher for higher frequencies, eventualìy a sound wave with the difference frequency remains. In this way it is possible to generate a low frequency sound wave in a narrow beam without side lobes, using a relativeìy smail transducer. The efficiency however is very low.
Subject
Historisch materiaal TNO
Underwater acoustics
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http://resolver.tudelft.nl/uuid:61ff7d24-1b0d-4cd1-9435-98443151372c
TNO identifier
492726
Source
Nederlands akoestisch genootschap, 11-28
Bibliographical note
Onderwaterakoestiek : Een bijeenkomst gehouden op 9 maart 1977 te 'Gravenhage
Document type
article