Contouring by electronic speckle pattern interferometry employing dual beam illumination

Area of Science:

• Optical Metrology
• Interferometry
• Image Processing

Background:

• Traditional methods for contour generation often struggle with diffuse objects.
• Electronic Speckle Pattern Interferometry (ESPI) offers a sensitive technique for surface deformation analysis.
• Contour generation is crucial for 3D surface profiling and metrology.

Purpose of the Study:

• To extend and analyze a dual beam illumination method for generating contours of diffuse objects.
• To investigate the sensitivity and orientation of contour planes.
• To introduce and validate a novel method for tilting contour planes.

Main Methods:

• Utilizing dual beam illumination coupled with electronic speckle pattern interferometry (ESPI).
• Analyzing sensitivity and orientation of contour planes.
• Implementing phase shifting and fringe analysis for experimental validation.

Main Results:

• The extended dual beam illumination method successfully generates contours for diffuse objects.
• Sensitivity and orientation of contour planes were thoroughly analyzed.
• The novel method for tilting contour planes demonstrated effective control and accurate results.

Conclusions:

• The developed technique provides an effective means for contour generation of diffuse objects.
• The study confirms good agreement between theoretical predictions and experimental outcomes.
• This work advances optical metrology techniques for surface profiling.