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Updated: Jun 16, 2026
08:19
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Published on: May 9, 2021
Summary
This study introduces a practical method using speckle patterns to analyze object rotations (tilts), even with in-plane movements. Young
Area of Science:
- Optics and Photonics
- Mechanical Engineering
- Materials Science
Background:
- Speckle phenomenon analysis is established for in-plane translations and oscillations.
- Investigating out-of-plane rotations (tilts) alongside in-plane movements presents a challenge.
Purpose of the Study:
- To develop a practical method for analyzing out-of-plane rotations (tilts) using speckle interferometry.
- To demonstrate a simple engineering tool for movement analysis.
Main Methods:
- Recording speckle patterns in the Fourier transform plane before and after tilting.
- Utilizing time-average exposure for oscillating objects.
- Observing Young's fringes in the Fraunhofer diffraction pattern of developed photographic plates illuminated with coherent light.
Main Results:
- Successfully demonstrated a method to investigate out-of-plane rotations (tilts).
- Observed Young's fringes directly related to tilts in the diffraction pattern.
- Validated theoretical and experimental findings.
Conclusions:
- The proposed method offers a straightforward engineering tool for analyzing object tilts.
- Speckle pattern analysis in the Fourier plane is effective for out-of-plane rotation measurement.
- The technique is applicable even when in-plane movements are present.
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