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Correlation measurements using clipped laser speckle.

J Marron1, G M Morris

  • 1University of Rochester, Institute of Optics, Rochester, New York 14627, USA.

Applied Optics
|March 1, 1986
PubMed
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Clipped laser speckle correlation enables high-speed measurements of dynamic speckle. This method simplifies correlation analysis for accurate velocity determination in various applications.

Area of Science:

  • Optics and Photonics
  • Experimental Physics

Background:

  • Laser speckle patterns arise from coherent light scattering off rough surfaces.
  • Measuring time-varying speckle is crucial for applications like velocity measurement.
  • Standard intensity correlation methods can be computationally intensive.

Purpose of the Study:

  • To introduce and validate a simplified method for laser speckle correlation analysis.
  • To enable high-speed measurements of speckle correlation and velocity.
  • To develop a closed-form approximation for clipped speckle correlation.

Main Methods:

  • Utilizing clipped laser speckle for correlation analysis.
  • Developing a closed-form approximation for the clipped correlation function.
  • Applying the method to measure speckle from a rotating diffuser with a 2-D detector array.

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Main Results:

  • Demonstrated that clipped speckle correlation allows for high-speed measurements.
  • Presented a closed-form approximation valid for arbitrary clipping thresholds.
  • Successfully measured speckle correlation from a rotating diffuser.

Conclusions:

  • Clipped laser speckle correlation is an effective and efficient technique for measuring dynamic speckle.
  • The developed approximation simplifies correlation calculations.
  • The method shows promise for real-time velocity measurements.