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An Improved Impact Source Locating System Using FBG Rosette Array.

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Summary
This summary is machine-generated.

Detecting foreign object impacts on structures is crucial. Fiber Bragg grating (FBG) sensors show promise, and a rosette configuration significantly improves impact localization accuracy across the entire monitored surface.

Keywords:
FBG arrayFBG rosetteFiber Bragg gratingdirectional sensitivityimpact monitoringimpact source localizationstructural health monitoring

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Area of Science:

  • Materials Science
  • Structural Health Monitoring
  • Optical Sensing Technologies

Background:

  • Structures vulnerable to foreign object impacts require effective detection and localization systems.
  • Fiber Bragg grating (FBG) sensors offer advantages like small size, electromagnetic immunity, and durability for impact monitoring.
  • A key limitation of single FBG sensors is their directional sensitivity, restricting accurate localization to within 50° of the fiber axis.

Purpose of the Study:

  • To enhance the accuracy of impact detection and localization systems using Fiber Bragg grating (FBG) sensors.
  • To investigate methods for overcoming the directional sensitivity limitations of FBG sensors.
  • To evaluate the effectiveness of improved interrogation schemes and rosette FBG configurations.

Main Methods:

  • Implemented an enhanced interrogation scheme with increased light source intensity and a steeper edge filter to improve signal-to-noise ratio.
  • Developed and tested cascaded rosettes of two orthogonal FBGs to mitigate directional sensitivity issues.
  • Analyzed three different wavelength configurations for the FBG rosettes to determine optimal performance.

Main Results:

  • A four-fold increase in signal-to-noise ratio from the enhanced interrogation scheme provided only marginal improvements in location accuracy.
  • The performance of the FBG rosette approach was highly dependent on the relative positioning of Bragg wavelengths and the light source spectrum.
  • An optimal wavelength configuration for the FBG rosette array demonstrated the potential for accurate impact localization across the entire plate surface.

Conclusions:

  • While enhanced light sources offer limited improvements, FBG rosette arrays present a viable solution for overcoming directional sensitivity limitations.
  • Careful selection of wavelength configurations is critical for maximizing the accuracy of FBG rosette-based impact localization systems.
  • The rosette FBG array, with optimal configuration, can achieve high accuracy impact detection and localization over extended areas, enhancing structural health monitoring capabilities.