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APPLICATIONS OF UNDERWATER ACOUSTICS
BASIC PROBLEMS OF SIGNAL RECEPTION
THE PROPAGATION OF SOUND
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absorption acoustic impedance acoustic intensity acoustic pressure acoustic wave amplitude angle of incidence applied attenuation axis bandwidth beam beamwidth boundary centre Chapter characteristic acoustic impedance circle diagram component constant correlation delay line density depth directional pattern distance ducer electric field electrostrictive electrostrictive transducers energy equation equivalent circuit expression factor frequency given by eqn gives horizontal hydrophones kc/s length limiting ray logio loss m/sec magnetic field magnetostrictive magnetostrictive transducer measured mechanical medium minor lobes normal obtained oscillator output particle displacement particle velocity path peak phase phase-shift plane wave polarity propagation velocity pulse radiating ray tracing receiver reflection coefficient refraction resistance resonance response resulting sea-floor Section shown in Fig signal sin2 sinusoidal Snell's Law sonar sonar system sound ray spherical wave stress surface taper function target thermal tion trans transducer transducer elements transmitted underwater acoustics velocity gradient velocity of propagation waveform wavelength zero