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Acoustic emission source location using a distributed feedback fiber laser rosette.

Wenzhu Huang1, Wentao Zhang, Fang Li

  • 1Optoelectronic System Laboratory, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China. zhangwt@semi.ac.cn.

Sensors (Basel, Switzerland)
|October 22, 2013
PubMed
Summary
This summary is machine-generated.

This study introduces a novel acoustic emission (AE) source localization method using distributed feedback (DFB) fiber lasers for detecting structural damage. The approach offers higher strain resolution and accounts for different AE source types compared to traditional methods.

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Area of Science:

  • Structural Health Monitoring
  • Materials Science
  • Optical Sensing

Background:

  • Acoustic emission (AE) is crucial for detecting damage in civil structures.
  • Existing methods like Fiber Bragg Grating (FBG) have limitations in strain resolution and source type consideration.

Purpose of the Study:

  • To develop and validate a new AE source localization approach using distributed feedback (DFB) fiber lasers.
  • To enhance damage detection capabilities in large structures like marble stones.

Main Methods:

  • Investigated directional sensitivity of DFB fiber lasers.
  • Employed digital signal analysis, including autocorrelation and wavelet packet energy, to extract location coefficients.
  • Utilized a Delta (Δ) DFB fiber laser rosette configuration.
  • Normalized signals to mitigate distance and intensity influences.

Main Results:

  • Successfully determined AE source locations using the proposed location algorithm.
  • Demonstrated higher strain resolution for AE detection compared to FBG methods.
  • Showcased the ability to accommodate two distinct types of AE sources.

Conclusions:

  • The proposed DFB fiber laser-based AE localization method is effective for structural damage detection.
  • This approach offers superior performance over traditional FBG techniques, particularly in resolution and source type adaptability.