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A fiber optic Doppler sensor and its application in debonding detection for composite structures.

Fucai Li1, Hideaki Murayama, Kazuro Kageyama

  • 1State Key Laboratory of Mechanical System and Vibration, Shanghai Jiao Tong University, Shanghai 200240, China. fcli@sjtu.edu.cn

Sensors (Basel, Switzerland)
|January 6, 2012
PubMed
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This study detects debonding damage in carbon fiber reinforced plastic (CFRP) lap splice joints using guided ultrasonic waves and Fiber Optic Doppler (FOD) sensors. Debonding causes detectable signal delays, enabling damage inspection and extent estimation.

Area of Science:

  • Materials Science
  • Structural Health Monitoring
  • Non-Destructive Testing

Background:

  • Debonding is a critical failure mode in fiber-reinforced composites.
  • Lap splice joints are common in carbon fiber reinforced plastic (CFRP) structures.
  • Effective damage detection is crucial for structural integrity.

Purpose of the Study:

  • To detect debonding damage in CFRP lap splice joints.
  • To utilize guided ultrasonic waves captured by Fiber Optic Doppler (FOD) sensors.
  • To optimize FOD sensor placement and evaluate laser sources for Doppler shift measurement.

Main Methods:

  • Employing guided ultrasonic wave propagation in CFRP structures.
  • Using spiral-shaped Fiber Optic Doppler (FOD) sensors.
Keywords:
Fiber optic Doppler sensorcomposite structuresdebonding damage detectionguided wave

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  • Comparing He-Ne and infrared semiconductor lasers for Doppler frequency shift measurement.
  • Optimizing sensor locations based on joint mechanics.
  • Applying signal processing techniques to analyze wave signals.

    • Main Results:

    • Debonding in lap splice joints causes a measurable arrival time delay in guided wave signals.
    • The FOD sensor effectively captures these wave signals.
    • Signal processing reveals characteristic features indicative of damage.

    Conclusions:

    • The arrival time delay of guided wave signals is a reliable indicator of debonding damage in CFRP lap splice joints.
    • This method allows for debonding damage inspection and estimation of damage extent.
    • FOD sensors offer a viable solution for structural health monitoring of composite structures.