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Related Concept Videos

Sound as Pressure Waves01:17

Sound as Pressure Waves

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Sound waves, which are longitudinal waves, can be modeled as the displacement amplitude varying as a function of the spatial and temporal coordinates. As a column of the medium is displaced, its successive columns are also displaced. As the successive displacements differ relatively, a pressure difference with the surrounding pressure is created. The gauge pressure varies across the medium.
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Brain waves are electrical signals generated by the neurons in the brain, which are regularly monitored to measure mental activities. Brain waves and their frequency ranges can be measured using an electroencephalogram or EEG. There are four main types of brain waves, each with distinct characteristics:
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Perception of Sound Waves01:01

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The human ear is not equally sensitive to all frequencies in the audible range. It may perceive sound waves with the same pressure but different frequencies as having different loudness. Moreover, the perception of sound waves depends on the health of an individual's ears, which decays with age. The health of one's ears may also be affected by regular exposure to loud noises.
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The intensity of sound waves can be related to displacement and pressure amplitudes by using their wave expressions and the definition of intensity. The critical step to achieve this is to write the power delivered by the particles on the wave as the product of force and velocity and simplify the force per unit area as the pressure. The velocity of the medium's particles can be derived from the displacement.
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Sound Waves: Interference00:53

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Sound waves can be modeled either as longitudinal waves, wherein the molecules of the medium oscillate around an equilibrium position, or as pressure waves. When two identical waves from the same source superimpose on each other, the combination of two crests or two troughs results in amplitude reinforcement known as constructive interference. If two identical waves, that are initially in phase, become out of phase because of different path lengths, the combination of crests with troughs...
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The simplest mechanical waves are associated with simple harmonic motion and repeat themselves for several cycles. These simple harmonic waves can be modeled using a combination of sine and cosine functions. Consider a simplified surface water wave that moves across the water's surface. Unlike complex ocean waves, in surface water waves, water moves vertically, oscillating up and down, whereas the disturbance of the wave moves horizontally through the medium. If a seagull is floating on the...
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Head wave correlations in ambient noise.

John Gebbie1, Martin Siderius2

  • 1Metron Scientific Solutions, 1900 Southwest 4th Avenue, Suite 89-01, Portland, Oregon, 97201, USA gebbie@metsci.com.

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Ambient ocean noise reveals faster head wave propagation using a vertical line array. Surface noise amplifies head waves, enhancing their detection in ocean acoustics experiments and simulations.

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Area of Science:

  • Ocean acoustics
  • Seismic wave propagation

Background:

  • Head waves, a type of critically propagating wave at the water-sediment interface, can travel faster than pure water waves.
  • These head waves are typically weak and overshadowed by conventional acoustic signals.
  • Understanding their behavior is crucial for interpreting underwater acoustic data.

Purpose of the Study:

  • To investigate the presence and characteristics of head wave multipath propagation in ambient ocean noise.
  • To demonstrate how surface-generated noise can enhance the detectability of head waves.
  • To validate findings through experimental data and numerical simulations.

Main Methods:

  • Processing ambient ocean noise using a vertical line array.
  • Measuring wave coherence by cross-correlating critically steered beams.
  • Conducting full wave simulations to model acoustic propagation.

Main Results:

  • Coherent, time-separated arrivals were detected, indicating head wave multipath propagation.
  • Surface-generated noise was shown to amplify the coherence between head waves and water-only waves.
  • The phenomenon was successfully demonstrated in both experimental and simulated environments.

Conclusions:

  • Ambient ocean noise analysis with vertical line arrays can reveal subtle acoustic phenomena like head waves.
  • Surface noise plays a significant role in enhancing the signal-to-noise ratio for head wave detection.
  • The study confirms the existence and enhanced detectability of head waves through combined experimental and simulation approaches.