Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Impulse Response01:17

Impulse Response

The impulse response is the system's reaction to an input impulse. In an RC circuit, the voltage source is the input, and the capacitor's voltage is the output. The system's state and output response before and after input excitation are distinctly defined.
Kirchhoff's law forms an input signal equation, with the capacitor's current and voltage providing the output. Substituting the current and dividing by RC yields a differential equation. The output for an impulse input is the impulse...
Traveling Waves: Lossless Lines01:27

Traveling Waves: Lossless Lines

The provided content explores the behavior of traveling waves on single-phase lossless transmission lines. It begins with a single-phase two-wire lossless transmission line of length Δx, characterized by a loop inductance LH/m and a line-to-line capacitance C F/m. These parameters result in a series inductance LΔx and a shunt capacitance CΔx.
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...
Interference and Diffraction02:18

Interference and Diffraction

Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
Convolution Properties I01:20

Convolution Properties I

Convolution computations can be simplified by utilizing their inherent properties.
The commutative property reveals that the input and the impulse response of an LTI (Linear Time-Invariant) system can be interchanged without affecting the output:
Interference: Path Lengths01:10

Interference: Path Lengths

Consider two sources of sound, that may or may not be in phase, emitting waves at a single frequency, and consider the frequencies to be the same.
Two special sources may be considered when they are in phase. This can be easily achieved by feeding the two sources from the same source. An example would be synchronizing the two speakers by feeding them with the same source, such as the sound waves produced by a tuning fork. This setup ensures that the two sources have the same frequency and are...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Doppler Passive Fathometry.

The Journal of the Acoustical Society of America·2018
Same author

The ocean noise coherence matrix and its rank.

The Journal of the Acoustical Society of America·2018
Same author

Separation of measured noise coherence matrix into Toeplitz and Hankel parts.

The Journal of the Acoustical Society of America·2017
Same author

Efficient modeling of range-dependent ray convergence effects in propagation and reverberation.

The Journal of the Acoustical Society of America·2015
Same author

Ray convergence in a flux-like propagation formulation.

The Journal of the Acoustical Society of America·2013
Same author

Synthetic array processing of ocean ambient noise for higher resolution seabed bottom loss estimation.

The Journal of the Acoustical Society of America·2013

Related Experiment Video

Updated: Jun 2, 2026

Cortical Bone Assessment Using Ultrasonic Guided Waves: A Reproducibility Study in a Healthy Population
09:02

Cortical Bone Assessment Using Ultrasonic Guided Waves: A Reproducibility Study in a Healthy Population

Published on: January 31, 2025

The relation between the waveguide invariant, multipath impulse response, and ray cycles.

Chris H Harrison1

  • 1NATO Undersea Research Centre, Viale San Bartolomeo 400, 19126 La Spezia, Italy. harrison@nurc.nato.int

The Journal of the Acoustical Society of America
|May 17, 2011
PubMed
Summary

This study reveals that acoustic striations, typically seen as modal phenomena, arise from variations in eigenray arrival times. This multipath impulse response variation explains the waveguide invariant (β) and its dependence on environmental factors.

More Related Videos

Tracking Infiltration Front Depth Using Time-lapse Multi-offset Gathers Collected with Array Antenna Ground Penetrating Radar
07:14

Tracking Infiltration Front Depth Using Time-lapse Multi-offset Gathers Collected with Array Antenna Ground Penetrating Radar

Published on: May 1, 2018

Measurement of the Directional Information Flow in fNIRS-Hyperscanning Data using the Partial Wavelet Transform Coherence Method
08:42

Measurement of the Directional Information Flow in fNIRS-Hyperscanning Data using the Partial Wavelet Transform Coherence Method

Published on: September 3, 2021

Related Experiment Videos

Last Updated: Jun 2, 2026

Cortical Bone Assessment Using Ultrasonic Guided Waves: A Reproducibility Study in a Healthy Population
09:02

Cortical Bone Assessment Using Ultrasonic Guided Waves: A Reproducibility Study in a Healthy Population

Published on: January 31, 2025

Tracking Infiltration Front Depth Using Time-lapse Multi-offset Gathers Collected with Array Antenna Ground Penetrating Radar
07:14

Tracking Infiltration Front Depth Using Time-lapse Multi-offset Gathers Collected with Array Antenna Ground Penetrating Radar

Published on: May 1, 2018

Measurement of the Directional Information Flow in fNIRS-Hyperscanning Data using the Partial Wavelet Transform Coherence Method
08:42

Measurement of the Directional Information Flow in fNIRS-Hyperscanning Data using the Partial Wavelet Transform Coherence Method

Published on: September 3, 2021

Area of Science:

  • Ocean acoustics
  • Wave propagation physics

Background:

  • The waveguide invariant (β) is traditionally viewed as a modal phenomenon.
  • Acoustic striations, observed as interference fringes, are linked to β in frequency vs. source-receiver separation plots.

Purpose of the Study:

  • To demonstrate that acoustic striations can be explained by eigenray arrival time variations.
  • To analytically and numerically investigate the factors influencing β and striation clarity.

Main Methods:

  • Analysis of eigenray arrival time variations with range.
  • Analytical calculations of β for various sound speed profiles.
  • Numerical confirmation of striation patterns using eigenray travel times.

Main Results:

  • Striations are explained by the variation of the multipath impulse response.
  • β's dependence on sound speed profile, source-receiver depth, and bathymetry is determined.
  • Conditions for clear fringes based on sound speed profile smoothness are identified.

Conclusions:

  • The eigenray approach provides a simpler explanation for acoustic striations.
  • Understanding β's dependencies aids in interpreting acoustic data and reverberation.
  • The utility of striations in analyzing acoustic environments is highlighted.