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Optical derotator alignment using image-processing algorithm for tracking laser vibrometer measurements of rotating

Hossam Khalil1, Dongkyu Kim1, Youngjoon Jo1

  • 1School of Mechanical Engineering, Gwangju Institute of Science and Technology, Buk-gu, Gwangju 61005, South Korea.

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Summary
This summary is machine-generated.

A new image-processing method precisely aligns Dove prism derotators for laser-scanning vibrometer measurements of rotating objects. This improves vibration analysis accuracy by correcting misalignment issues.

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Area of Science:

  • Optical engineering
  • Mechanical engineering
  • Vibration analysis

Background:

  • Dove prisms are used as derotators in laser-scanning vibrometers (LSVs) for measuring rotating object vibrations.
  • Accurate alignment of the derotator with the object's rotational axis is critical for precise vibration measurements.
  • Misalignment leads to inaccuracies due to laser beam alteration on the rotating surface.

Purpose of the Study:

  • To propose and experimentally validate a novel image-processing method for aligning Dove prism derotators with rotating objects.
  • To address the critical need for precise derotator alignment in LSV measurements.
  • To enhance the accuracy of vibration measurements on rotating machinery.

Main Methods:

  • An image-processing algorithm was developed to track the trajectory of a landmark attached to the rotating object.
  • The landmark's trajectory was mathematically modeled to calculate derotator misalignment.
  • Experimental tests were conducted to evaluate the accuracy of the proposed alignment method.

Main Results:

  • The proposed method successfully calculates the degree of derotator misalignment.
  • Experimental validation demonstrated the effectiveness of the image-processing algorithm for alignment.
  • The method provides a reliable way to ensure accurate vibration measurements.

Conclusions:

  • The developed image-processing technique offers a robust solution for aligning derotators in LSV systems.
  • Accurate derotator alignment is achievable through landmark trajectory analysis.
  • This method enhances the reliability and precision of vibration analysis for rotating components.