High-speed scanning stroboscopic fringe-pattern projection technology for three-dimensional shape precision...

Area of Science:

• Optics and Photonics
• Metrology
• Computer Vision

Background:

• Accurate 3D shape measurement is crucial for precision engineering and industrial inspection.
• Existing methods often face limitations in speed, accuracy, or adaptability to diverse object properties.
• Stroboscopic fringe-pattern projection offers a promising approach for high-speed 3D reconstruction.

Purpose of the Study:

• To design and validate a high-speed scanning stroboscopic fringe-pattern projection system.
• To combine the speed of grating projection with the accuracy of line-structured lasers.
• To enable flexible and precise 3D topography measurements for various objects and environments.

Main Methods:

• Utilized a high-speed rotating polygon mirror and a line-structured laser.
• Developed a system for generating stable, unambiguous stroboscopic fringe patterns with adjustable parameters.
• Employed circuit modulation for real-time control and flexibility in fringe pattern projection.
• Integrated light intensity adjustment algorithms and 3D computation models for data processing.

Main Results:

• Achieved a fast frame rate, high fringe density, precision, and brightness.
• Verified system stability and characteristics through experiments.
• Demonstrated a finest linewidth of 40 μm and a minimum fringe cycle of 80 μm.
• Successfully obtained high-accuracy 3D topography for objects with varying sizes, morphologies, and optical properties.

Conclusions:

• The developed system offers a robust solution for fast 3D shape precision measurements.
• Its flexibility and accuracy make it suitable for diverse measurement scenarios.
• Shows significant potential for industrial applications, especially in 3D online detection of precision devices.