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In-plane ESPI with unlimited angle of view for multi-object rotation angle determination
Optics Letters
|November 15, 2023
Summary
This study enhances in-plane electronic speckle pattern interferometry (ESPI) to overcome limited viewing angles. A novel approach enables real-time rotation angle measurement for multiple objects, improving dynamic measurement capabilities.
Area of Science:
- Optical Metrology
- Interferometry
- Granular Dynamics
Background:
- In-plane electronic speckle pattern interferometry (ESPI) provides sensitive, dynamic measurements.
- A limited angle of view (AOV) hinders ESPI's application in determining rotation angles of multiple objects.
Purpose of the Study:
- To analyze factors limiting the AOV in in-plane ESPI.
- To propose and demonstrate an "image transmitting" approach to enlarge the AOV.
- To develop an AOV-unlimited interferometer for real-time multi-object rotation angle determination.
Main Methods:
- Analysis of factors affecting ESPI's angle of view.
- Implementation of an "image transmitting" approach using a folded dual-telescope imaging system.
- Development of an AOV-unlimited interferometer.
Main Results:
- The proposed method effectively enlarges the angle of view for in-plane ESPI.
- The developed interferometer can determine multi-object rotation angles in real time.
- Demonstrated practicability in measuring rotation angles of disks in a 2D granular system.
Conclusions:
- The developed AOV-unlimited interferometer overcomes ESPI's limitations for multi-object rotation analysis.
- This technique offers a practical solution for real-time dynamic measurements in granular systems and other applications.
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