Three-Dimensional Surface Reconstruction for Specular/Diffuse Composite Surfaces

Area of Science:

• Optics and Photonics
• Metrology
• Materials Science

Background:

• Fringe projection techniques excel on diffuse surfaces but struggle with specular components.
• Measuring composite surfaces with mixed reflectance is challenging for traditional 3D profilometry.
• Accurate 3D surface profiling is crucial for quality control in electronics manufacturing.

Purpose of the Study:

• To develop an effective 3D surface reconstruction technique for composite surfaces.
• To overcome the limitations of fringe projection on surfaces with mixed specular and diffuse reflectance.
• To enable simultaneous capture of both reflected light types in a single optical path.

Main Methods:

• Integration of digital holography with fringe projection setup.
• Simultaneous capture of specular and diffuse reflected light.
• Full-field surface profilometry using combined optical paths.
• Absolute phase determination of composite surfaces via fringe analysis.

Main Results:

• Successful and accurate 3D profile reconstruction of composite surfaces.
• Effective detection of both specular and diffuse reflectance components.
• Demonstrated capability for precise 3D surface measurement of integrated circuit carrier boards.
• Validation of the technique's effectiveness on complex, real-world samples.

Conclusions:

• The proposed technique offers a robust solution for 3D surface reconstruction of challenging composite materials.
• Combining digital holography and fringe projection enhances measurement accuracy and efficiency.
• This method advances non-destructive testing and quality assessment for electronic components.