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Multipoint laser Doppler vibrometry with single detector: principles, implementations, and signal analyses.

Y Fu1, M Guo, P B Phua

  • 1Temasek Laboratories & School of Physical and Mathematical Sciences, Nanyang Technological University, 50 Nanyang Drive, Singapore 637553.

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Summary

This study presents a 20-point laser Doppler vibrometer for noncontact dynamic measurements. The system uses a single laser and photodetector to simultaneously measure vibrations at multiple points on an object.

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Area of Science:

  • Optics and Photonics
  • Mechanical Engineering
  • Signal Processing

Background:

  • Noncontact dynamic measurement of vibrating objects is crucial in various engineering fields.
  • Traditional laser Doppler vibrometers often measure only a single point, limiting efficiency for multi-point analysis.

Purpose of the Study:

  • To develop and demonstrate a 20-point laser Doppler vibrometer (LDV) system.
  • To achieve simultaneous, noncontact dynamic measurement of vibration at multiple points using a single photodetector.

Main Methods:

  • A 5x4 array of laser beams with distinct frequency shifts was generated using a distributed feedback laser and acousto-optic devices.
  • Reflected beams were collected via a single-mode fiber and interfered with a reference beam.
  • Signal processing algorithms, including Fourier and windowed Fourier transforms, were employed to extract vibration data from a single-channel output, mitigating crosstalk.

Main Results:

  • Simultaneous vibration measurement at 20 distinct points was successfully demonstrated.
  • The system utilized a single laser source and a single photodetector for multi-point measurements.
  • Experimental results showed good agreement when compared to a commercial single-point laser vibrometer.

Conclusions:

  • The developed 20-point laser Doppler vibrometer enables efficient, simultaneous multi-point vibration analysis.
  • This approach offers a significant advancement over single-point measurement techniques.
  • The system's design is suitable for various applications requiring comprehensive dynamic response assessment.