Title :
Interaction of a sound pulse with an elastic shell submerged in the sea
Author :
Gaunaurd, G.C. ; Strifors, H.C.
Author_Institution :
US Naval Surface Warfare Center, Silver Spring, MD, USA
Abstract :
The transient interaction of an acoustic pulse with an elastic, air-filled, spherical shell submerged in water is described. The interaction is described analytically, and it is evaluated numerically. Short (or long) pulses have a broad (or narrow) spectrum that will excite numerous (or a single one) shell resonances within its spectral band. A study of the backscattered returns is presented and it is shown how a suitable choice of ω0, the carrier frequency, and of the incident pulse-duration generate various types of echoes that one can predict, recognize, and use for target-ID purposes. If ω0 coincides with any one of the shell´s resonances, the echoes take on informative shapes that are displayed and discussed
Keywords :
echo; elasticity; sonar; underwater sound; air-filled spherical shell; backscattered returns; carrier frequency; echoes; elastic shell; hydroelasticity; impulse sonar; incident pulse-duration; seawater; shell resonances; sound pulse interaction; submerged in water; target identification; transient interaction; Acoustic pulses; Elasticity; Equations; Pulse shaping methods; Resonance; Sea surface; Shape; Silver; Springs; Steady-state;
Conference_Titel :
Ultrasonics Symposium, 1991. Proceedings., IEEE 1991
Conference_Location :
Orlando, FL
DOI :
10.1109/ULTSYM.1991.234259
