Capture and display mismatch compensation for real-time digital holographic interferometry

Area of Science:

• Optics and Photonics
• Digital Image Processing
• Metrology

Background:

• Optical holographic interferometry (HI) is a powerful metrology technique.
• Digital implementation typically uses double exposure holographic interferometry (DEHI).
• Real-time holographic interferometry (RTHI) faces challenges in digital setups.

Purpose of the Study:

• To address the pixel size mismatch between cameras and spatial light modulators in digital RTHI.
• To present and analyze novel approaches for overcoming magnification errors in digital RTHI.
• To evaluate the performance and experimental suitability of these proposed methods.

Main Methods:

• Numerical analysis of five distinct approaches to compensate for pixel size mismatch.
• Quantification of the performance of each compensation procedure.
• Investigation of the experimental feasibility of the developed methods.

Main Results:

• Successful identification and analysis of five methods to mitigate magnification errors.
• Numerical quantification of the effectiveness of each approach.
• Assessment of the practical applicability of the techniques in experimental RTHI.

Conclusions:

• The presented approaches offer viable solutions for the pixel size mismatch problem in digital RTHI.
• The findings pave the way for more accurate and robust real-time digital holographic interferometry.
• Further experimental validation is recommended to confirm the practical performance of these methods.