Acoustic Emission
Acoustic Emission - Related Videos
12:26
Fabrication, Operation and Flow Visualization in Surface-acoustic-wave-driven Acoustic-counterflow Microfluidics
0 Views •
Cited by 4 •
2013
In this video we first describe fabrication and operation procedures of a surface acoustic wave (SAW) acoustic counterflow device. We then demonstrate an experimental setup that allows for both qualitative flow visualization and quantitative analysis of complex flows within the SAW pumping device.
08:18
Design and Use of a Full Flow Sampling System (FFS) for the Quantification of Methane Emissions
0 Views •
Cited by 13 •
2016
We have designed, developed, and implemented a novel full flow sampling system (FFS) for quantification of methane emissions and greenhouse gases from across the natural gas supply chain.
14:22
Activating Molecules, Ions, and Solid Particles with Acoustic Cavitation
0 Views •
Cited by 6 •
2014
Acoustic cavitation in liquids submitted to power ultrasound creates transient extreme conditions inside the collapsing bubbles, which are the origin of unusual chemical reactivity and light emission, known as sonoluminescence. In the presence of noble gases, nonequilibrium plasma is formed. The "hot" particles and the photons generated by collapsing bubbles are able to excite species in solution.
02:39
Emission Spectra
0 Views •
2020
When solids, liquids, or condensed gases are heated sufficiently, they radiate some of the excess energy as light. Photons produced in this manner have a range of energies, and thereby produce a continuous spectrum in which an unbroken series of wavelengths is present. In contrast to continuous spectra, light can also occur as discrete or line spectra having very narrow linewidths interspersed throughout the spectral regions. Exciting a gas at low partial pressure using an electrical current,...
02:47
Metal Flame Emission - Concepts
0 Views •
2020
Metal Flame Emission Flame testing is an analytical technique where a sample is placed in a flame, and the characteristic flame color is used to identify the substance. Each element has a characteristic light emission when placed into a flame, meaning each element produces a unique color. This phenomenon is used in fireworks displays, where the color of the fireworks corresponds to a specific characteristic of a metal. The emission of colored light from a burning sample is the direct result of...
FAQs
The measured signal carries information about the event that produced it. Crack growth, plastic deformation, friction, and fiber breakage redistribute stress within a component and generate transient high-frequency waves. Examining event timing, amplitude, and location helps engineers associate detected activity with internal changes and determine where damage is developing.
During applied loading, internal processes can release stored elastic energy as damage becomes active. Monitoring during this condition allows engineers to detect damage as it develops rather than only identifying an existing defect afterward. This capability supports the identification of active defects, structural-integrity assessment, and maintenance decisions before failure occurs.
Piezoelectric sensors capture the high-frequency stress waves produced by internal changes. The resulting measurements are examined through their timing, amplitude, and location, giving engineers several ways to characterize detected activity within a component. Together, these features help connect an observed signal with the progression and position of possible damage.
A typical workflow places piezoelectric sensors on the component, observes the structure while relevant loading or operation occurs, and records the resulting stress-wave activity. Engineers then analyze the detected signals for timing, amplitude, and location. These results are used to identify active defects, assess structural integrity, and guide appropriate maintenance decisions.
The method applies across several engineering contexts, including pressure vessels, bridges, composite materials, and manufactured components. Its value comes from detecting internal activity without requiring the component to be destroyed. By revealing damage processes as they occur, testing can support structural health monitoring and help determine whether maintenance or further integrity assessment is needed.
Acoustic emission provides information about active internal changes while a structure is being monitored under load. Engineers can use detected activity, including its timing, amplitude, and location, to evaluate structural integrity and identify developing defects. This information supports earlier maintenance planning, helping address damage before it progresses to structural failure.