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Related Experiment Video

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Fabrication and Testing of Microfluidic Optomechanical Oscillators
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Measurement of micro-harmonic vibration from optical feedback interferometry using wavelet trend analysis.

Vibhor Kumar Bhardwaj1,2, Surita Maini1

  • 1Department of Electrical and Instrumentation Engineering, Sant Longowal Institute of Engineering & Technology, Sangrur, India.

Optics Communications
|August 25, 2020
PubMed
Summary
This summary is machine-generated.

This study introduces a new method for measuring vibration frequency using laser sensors and wavelet analysis. It accurately reconstructs micro-harmonic vibrations up to 1 kHz and measures higher frequencies, offering a low-cost solution for fault detection.

Keywords:
Maximal overlap discrete wavelet transformationOptical sensorSelf-mixing interferometryTrend analysisVibration measurement

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Area of Science:

  • Optical sensing
  • Signal processing
  • Vibration analysis

Background:

  • Self-mixed (SM) optical feedback interferometry is promising for vibration frequency measurement.
  • Existing methods for extracting vibration data from SM signals require improvements in complexity and accuracy.

Purpose of the Study:

  • To develop a novel, accurate, and less complex method for vibration frequency measurement.
  • To address the limitations of current techniques in analyzing self-mixed laser signals.

Main Methods:

  • Utilized maximal overlap discrete wavelet transformation (MODWT) and multi-resolution analysis (MRA).
  • Applied the method to reconstruct micro-harmonic vibrations and measure vibration frequencies under varying feedback conditions.

Main Results:

  • Successfully reconstructed micro-harmonic vibrations up to 1 kHz with low error (MSE < 1.89, Max Rel Error < 8.79%).
  • Measured vibration frequencies up to 10 kHz with high accuracy (±0.0001).
  • Demonstrated suitability for non-sinusoidal vibration measurement under moderate feedback.

Conclusions:

  • The proposed MODWT and MRA method offers an improved approach for vibration frequency measurement.
  • This technique provides a compact, non-contact, and cost-effective alternative for applications like fault detection and medical diagnostics.