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Cylinder gauge measurement using a position sensitive detector.

W Doyle St John1

  • 1Department of Chemistry and Engineering Physics, University of Wisconsin-Platteville, USA. stjohn@uwplatt.edu

Applied Optics
|October 24, 2007
PubMed
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Determination of the beam centroid of an obstructed focused Gaussian laser beam.

Applied optics·2009
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A position sensitive detector (PSD) measures cylindrical pin diameter by tracking laser beam centroid shifts. The maximum shift directly correlates to the pin

Area of Science:

  • Optics and Photonics
  • Metrology
  • Mechanical Engineering

Background:

  • Accurate measurement of cylindrical object dimensions is crucial in manufacturing and research.
  • Traditional measurement techniques can be time-consuming or require physical contact.

Purpose of the Study:

  • To develop a non-contact method for determining the diameter of cylindrical pins.
  • To utilize the optical principle of laser beam centroid shift for dimensional metrology.

Main Methods:

  • Employing a position sensitive detector (PSD) to monitor a laser beam.
  • Defining the light beam centroid as the intensity-weighted average position.
  • Observing and quantifying the centroid shift of an axially symmetric beam partially obstructed by a cylinder.
  • Correlating the maximum observed centroid shift to the cylinder's diameter.

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Main Results:

  • A measurable shift in the laser beam centroid occurs when obstructed by a cylinder.
  • The maximum centroid shift is uniquely determined by the diameter of the obstructing cylinder.
  • This method allows for precise, non-contact diameter determination.

Conclusions:

  • The PSD-based method offers an effective way to measure cylindrical pin diameters.
  • The technique leverages optical beam displacement for accurate dimensional analysis.
  • This approach provides a novel and efficient solution for metrology applications.