Performance evaluation of a digital holographic camera under variable source power and exposure time

Area of Science:

• Optics and Photonics
• Digital Imaging
• Metrology

Background:

• Digital holography enables 3D reconstruction of objects.
• Image quality in digital holography is crucial for accurate analysis.
• Various experimental configurations exist, each with potential advantages and disadvantages.

Purpose of the Study:

• To evaluate and compare the quality of reconstructed amplitude images from three distinct digital holographic experimental configurations.
• To optimize light source power and sensor exposure time for each configuration based on image quality metrics.
• To analyze the performance trade-offs of different digital holography setups under varying optical conditions.

Main Methods:

• Recording digital holograms using conventional off-axis, concave-lens-based, and a specialized digital holographic camera.
• Quantifying reconstructed image quality using speckle index, peak signal-to-noise ratio (PSNR), and structural similarity index measure (SSIM).
• Systematically varying light source power and sensor exposure time to identify optimal parameters for each configuration.

Main Results:

• Quantitative quality metrics (speckle index, PSNR, SSIM) were calculated for all three configurations.
• Optimal ranges for light source power and exposure time were determined for each setup, leading to improved reconstructed image quality.
• Performance variations were observed among the three configurations, influenced by source power and exposure settings.

Conclusions:

• The study provides a comprehensive quality evaluation of reconstructed images in digital holography across different experimental setups.
• Optimization of optical parameters significantly enhances image quality, demonstrating the importance of fine-tuning for specific applications.
• The findings offer valuable insights for selecting and optimizing digital holographic systems for non-destructive testing and other applications.