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Related Concept Videos

Atomic Emission Spectroscopy: Lab01:29

Atomic Emission Spectroscopy: Lab

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AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...
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Atomic Emission Spectroscopy: Interference01:30

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In atomic emission spectroscopy (AES), high-temperature atomizers excite a broad range of elements and molecules that generate complex emissions from sources such as oxides, hydroxides, and flame combustion products in the flame or plasma. Several strategies can be employed to minimize spectral interferences caused by overlapping emission lines or bands. These include increasing instrument resolution, choosing alternative emission lines, optimally placing the detector in low-background regions,...
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Echo01:06

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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.
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Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...
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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
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Atomic Emission Spectroscopy: Instrumentation01:22

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The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers.  Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
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Evanescent Field Based Photoacoustics: Optical Property Evaluation at Surfaces
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A Joint Acoustic Emission Source Localization Method for Composite Materials.

Xiaoran Wang1, Fang Yin2, Zhishuai Wan3

  • 1Faculty of Information Technology, Beijing University of Technology, Beijing 100124, China.

Sensors (Basel, Switzerland)
|July 8, 2023
PubMed
Summary
This summary is machine-generated.

A new joint localization method for acoustic emission sources in composite materials combines time-difference-blind and beamforming techniques. This approach significantly improves localization accuracy and reduces detection time.

Keywords:
acoustic emissionbeamforming localizationcomposite materialsjoint localizationtime-difference-blind localization

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Area of Science:

  • Materials Science
  • Structural Health Monitoring
  • Acoustics

Background:

  • Damage localization in composite materials is crucial for structural integrity.
  • Existing methods like time-difference-blind and beamforming localization have individual limitations.
  • Acoustic emission (AE) is a key indicator of material damage.

Purpose of the Study:

  • To develop and validate a novel joint localization method for AE sources in composite materials.
  • To overcome the limitations of individual localization techniques.
  • To enhance both the speed and accuracy of damage detection.

Main Methods:

  • Analysis of the performance characteristics of time-difference-blind localization.
  • Evaluation of the performance characteristics of beamforming localization.
  • Development of a hybrid approach integrating both methods.
  • Validation through simulations and experimental testing.

Main Results:

  • The joint localization method demonstrated a 50% reduction in localization time compared to the beamforming method.
  • The proposed method achieved improved localization accuracy over the time-difference-blind method.
  • Simulations and experiments confirmed the efficacy of the joint approach.

Conclusions:

  • The joint localization method offers a superior alternative for AE source localization in composites.
  • This integrated approach balances speed and accuracy in damage detection.
  • The findings contribute to advancing structural health monitoring in composite materials.