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A multi-point laser Doppler vibrometer with fiber-based configuration.

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Summary

A new fiber-based multi-point Laser Doppler Vibrometer (LDV) enables simultaneous vibration measurement at multiple points. This system offers practical dynamic structural evaluation for industrial applications.

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Area of Science:

  • Optical Engineering
  • Vibrational Analysis
  • Structural Health Monitoring

Background:

  • Traditional Laser Doppler Vibrometers (LDVs) are limited to single-point measurements.
  • Scanning LDVs are often impractical for analyzing transient vibration events.
  • There is a need for non-contact, multi-point vibration measurement systems.

Purpose of the Study:

  • To propose and demonstrate a fiber-based, self-synchronized multi-point LDV system.
  • To enable simultaneous acquisition of vibration data from multiple spatial locations.
  • To enhance the practicality of dynamic structural evaluation.

Main Methods:

  • A single laser source generates multiple frequency-shifted beams.
  • Beams are projected onto a vibrating object and interfered with a reference beam.
  • A single-pixel photodetector captures the combined signal for multi-point analysis.
  • Fiber optics are utilized for system flexibility.

Main Results:

  • The system successfully measured steady-state harmonic vibration of a cantilever beam.
  • Numerical interpolation was used to reconstruct mode shapes, validated against FEM simulations.
  • The system identified the first five resonant frequencies during transient vibration measurements.
  • Simultaneous vibration data from multiple points were acquired.

Conclusions:

  • The developed fiber-based multi-point LDV provides simultaneous vibration measurement capabilities.
  • The system's fiber integration enhances flexibility for practical industrial applications.
  • This technology is suitable for dynamic structural evaluation and health monitoring.