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Speckle and fringe dynamics in imaging-speckle-pattern interferometry for spatial-filtering velocimetry
Michael L Jakobsen1, Theis F Q Iversen, Harold T Yura
1DTU Fotonik, Department of Photonics Engineering, Technical University of Denmark, Roskilde, Denmark. mlja@fotonik.dtu.dk
Applied Optics
|October 22, 2011
Summary
This study presents a novel method for real-time sensing of 3D motion and rotation using laser speckle interferometry. The technique accurately determines linear displacements and out-of-plane rotations from speckle and fringe dynamics.
Area of Science:
- Optical Metrology
- Interferometry
- Speckle Pattern Analysis
Background:
- Laser speckle interferometry is a powerful tool for non-contact measurement.
- Sensing complex 3D motion and rotation requires advanced analysis techniques.
Purpose of the Study:
- To develop and validate a method for real-time sensing of linear 3D motion and out-of-plane rotation.
- To analyze the dynamics of laser speckles and fringes for motion sensing.
Main Methods:
- Utilized optical spatial-filtering-velocimetry techniques.
- Applied ensemble-average cross-correlation to intensity distributions.
- Analyzed speckle and fringe dynamics theoretically and experimentally.
Main Results:
- Successfully determined the magnitude and direction of all three linear displacement components.
- Enabled simultaneous determination of out-of-plane rotation and its direction.
- Validated theoretical predictions with experimental measurements.
Conclusions:
- The proposed imaging-speckle-pattern interferometer can accurately measure 3D motion and out-of-plane rotation in real time.
- Spatial filtering velocimetry provides a robust approach for analyzing speckle and fringe dynamics.
- This method offers a comprehensive solution for dynamic object motion analysis.
