In the underwater context, it is known that the frequency diversity provides essential information to derive the nature of the seaoor. This presentation deals with a new concept based on a transmitter that generates simultaneously several harmonic frequencies. Our nal objective is to assert the feasibility of a multi-frequency tool whose desirable characteristics could be specied for applications such as detection of sunken oil slicks or sediment characterization. The acoustic beams are generated through the harmonic components of a shock wave radiated by an antenna driven at a high level. The source is unique in time and space so that the multi-frequency responses are inherently perfectly matched. A numerical model based on a generalized KZK equation has been developed to estimate the saturated elds. Tank measurements of the rst harmonic elds are compared with simulations.
Nonlinear multi-frequency transmitter for seafloor characterization
L Di Marcoberardino;
2010
Abstract
In the underwater context, it is known that the frequency diversity provides essential information to derive the nature of the seaoor. This presentation deals with a new concept based on a transmitter that generates simultaneously several harmonic frequencies. Our nal objective is to assert the feasibility of a multi-frequency tool whose desirable characteristics could be specied for applications such as detection of sunken oil slicks or sediment characterization. The acoustic beams are generated through the harmonic components of a shock wave radiated by an antenna driven at a high level. The source is unique in time and space so that the multi-frequency responses are inherently perfectly matched. A numerical model based on a generalized KZK equation has been developed to estimate the saturated elds. Tank measurements of the rst harmonic elds are compared with simulations.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
