Related Experiment Video
Updated: Apr 24, 2026
07:14
Tracking Infiltration Front Depth Using Time-lapse Multi-offset Gathers Collected with Array Antenna Ground Penetrating Radar
Published on: May 1, 2018
11.0K
Wave separation: application for arrival time detection in ultrasonic signals.
Patrick Avanesians1, Moe Momayez1
1Department of Mining and Geological Engineering, University of Arizona, United States.
Ultrasonics
|September 8, 2014
Summary
This study introduces a nonlinear decomposition technique for precise ultrasonic wave packet arrival time measurement. The method effectively extracts signals even when echoes are poorly separated in time, space, and frequency.
Area of Science:
- Nonlinear acoustics
- Signal processing
- Ultrasonic testing
Background:
- Accurate time-of-flight measurements are crucial in ultrasonic testing.
- Resolving closely spaced wave packets is a significant challenge in signal analysis.
Purpose of the Study:
- To develop a novel method for detecting and measuring wave packet arrival times in ultrasonic signals.
- To address the challenge of analyzing complex signals with poorly separated events.
Main Methods:
- A nonlinear decomposition technique was employed.
- The method was applied to analyze complex ultrasonic signals, including those with superimposed echoes.
Main Results:
- Exceptional estimates of the time of arrival were achieved.
- The technique successfully extracted information from poorly separated echoes in time, space, and frequency domains.
Conclusions:
- The nonlinear decomposition method offers a robust solution for precise arrival time estimation in ultrasonic analysis.
- This technique enhances the capability to analyze complex ultrasonic signals for accurate material characterization.
Related Concept Videos
01:06Echo
1.2K
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,...
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,...
1.2K
01:17Ultrasonography
6.5K
Ultrasonography is an imaging technique that uses high-frequency sound waves to visualize the body's internal structures. It is a non-invasive and safe procedure that does not involve the use of ionizing radiation, making it widely used in various medical fields. Ultrasonography is used to study heart function, blood flow in the neck or extremities, certain conditions such as gallbladder disease, and fetal growth and development.
During an ultrasonography procedure, a handheld device called...
During an ultrasonography procedure, a handheld device called...
6.5K
01:08IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations
2.0K
Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single...
2.0K
01:05Doppler Effect - II
4.1K
The Doppler effect has several practical, real-world applications. For instance, meteorologists use Doppler radars to interpret weather events based on the Doppler effect. Typically, a transmitter emits radio waves at a specific frequency toward the sky from a weather station. The radio waves bounce off the clouds and precipitation and travel back to the weather station. The radio frequency of the waves reflected back to the station appears to decrease if the clouds or precipitation are moving...
4.1K
01:10Interference: Path Lengths
2.5K
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...
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...
2.5K