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Related Concept Videos

Echo01:06

Echo

The human ear cannot distinguish between two sources of sound if they happen to reach within a specific time interval, typically 0.1 seconds apart. More than this, and they are perceived as separate sources.
Imagine the sound is reflected back to the ears. Assuming that the source is very close to the human, the difference between hearing the two sounds—the emitted sound and the reflected sound—may be more than the minimum time for perceiving distinct sounds. If this is the case, then the...
Reflection of Waves01:07

Reflection of Waves

When a wave travels from one medium to another, it gets reflected at the boundary of the second medium. A common example of this is when a person yells at a distance from a cliff and hears the echo of their voice. The sound waves (longitudinal waves) traveling in the air are reflected from the bounding cliff. Similarly, flipping one end of a string whose other end is tied to a wall causes a pulse (transverse wave) to travel through the string, which gets reflected upon reaching the wall. In...
Shock Waves01:16

Shock Waves

While deriving the Doppler formula for the observed frequency of a sound wave, it is assumed that the speed of sound in the medium is greater than the source's speed through it. When this condition is breached, a shock wave occurs.
When the source's speed approaches the speed of sound, constructive interference between successive wavefronts emitted by the source occurs immediately behind it. Initially, scientists believed that this constructive interference would result in such high pressures...
Sound Waves01:01

Sound Waves

Sound waves can be thought of as fluctuations in the pressure of a medium through which they propagate. Since the pressure also makes the medium's particles vibrate along its direction of motion, the waves can be modeled as the displacement of the medium's particles from their mean position.
Sound waves are longitudinal in most fluids because fluids cannot sustain any lateral pressure. In solids, however, shear forces help in propagating the disturbance in the lateral direction as well. Hence,...
Propagation of Waves01:07

Propagation of Waves

When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free.
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
Partial Differential Equations01:21

Partial Differential Equations

A stone dropped into a still pond generates waves that propagate outward in circular patterns, creating a dynamic surface whose elevation depends on both position and time. At any given location, the water level oscillates as the wave passes, while at any fixed moment, the surface exhibits smooth, curved structures extending across space. This dual dependence requires a mathematical description that accounts for variation in multiple variables simultaneously.At a fixed point on the water...

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Related Experiment Video

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A Stable Phantom Material for Optical and Acoustic Imaging
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Reflection of underwater sound from surface waves.

Chris T Tindle1, Grant B Deane, James C Preisig

  • 1Physics Department, University of Auckland, Bag, Auckland, New Zealand.

The Journal of the Acoustical Society of America
|January 29, 2009
PubMed
Summary

Underwater sound reflection from surface waves causes complex waveform variations. Wavefront modeling accurately predicts these interference patterns, matching experimental results.

Area of Science:

  • Acoustics
  • Oceanography
  • Wave physics

Background:

  • Surface waves significantly impact underwater sound propagation.
  • Understanding sound reflection is crucial for sonar and underwater communication.

Purpose of the Study:

  • To experimentally measure and theoretically model underwater sound reflection from surface waves.
  • To analyze the effects of wave crests on sound focusing and waveform complexity.

Main Methods:

  • Tank experiment to record sound reflection.
  • Wavefront modeling to simulate sound propagation and interference.
  • Comparison of theoretical predictions with experimental data.

Main Results:

  • Surface wave reflection causes focusing and caustics, leading to rapid waveform changes.

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  • Theoretical modeling shows interference of three surface-reflected eigenrays per wave crest.
  • Experimental and theoretical results show good agreement, even in shadow zones.

    • Conclusions:

    • Surface wave dynamics critically influence underwater acoustic signals.
    • Wavefront modeling provides a reliable tool for predicting complex reflection phenomena.
    • The study validates theoretical predictions against experimental observations in challenging acoustic environments.