研究目的
To propose a fast approach for phase reconstruction in dual-wavelength off-axis digital holography by combining critical sampling with division multiplexing to improve reconstruction speed.
研究成果
The proposed algorithm combining critical sampling with division multiplexing significantly improves the reconstruction speed of dual-wavelength off-axis digital holography, enabling real-time visualization with frame rates up to 46 fps for one megapixel holograms on a single-core personal computer.
研究不足
The cropped ratio in critical sampling affects both speed and quality; a larger ratio increases speed but may decrease quality. The study used a fixed cropped ratio of 4 for simplicity, which may not be optimal for all specimens.
1：Experimental Design and Method Selection:
The study combines critical sampling with division multiplexing to accelerate phase reconstruction. Critical sampling removes redundant data, and division multiplexing eliminates redundant calculation processes.
2：Sample Selection and Data Sources:
Dual-wavelength off-axis multiplexed holograms of a step target made of fused silica and a drop of alcohol were recorded.
3：List of Experimental Equipment and Materials:
A red laser (λ1 = 632.8 nm), a green laser (λ2 = 532 nm), two lenses with focal lengths of f = 200 mm, and a CCD camera with 1280 × 1024 pixels and pixel size of 4.8 μm × 4.8 μm.
4：8 nm), a green laser (λ2 = 532 nm), two lenses with focal lengths of f = 200 mm, and a CCD camera with 1280 × 1024 pixels and pixel size of 8 μm × 8 μm.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The holograms were processed using three algorithms (A, B, C) to compare reconstruction quality and speed. Algorithm C, combining critical sampling with division multiplexing, was highlighted for its efficiency.
5：Data Analysis Methods:
The reconstruction quality was evaluated by comparing phase maps and processing times. The speed was measured in frames per second (fps).
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