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GOBO projection for 3D measurements at highest frame rates: a performance analysis
Stefan Heist1,2, Patrick Dietrich1,2, Martin Landmann1,2
11Institute of Applied Physics, Abbe Center of Photonics, Friedrich Schiller University, 07745 Jena, Germany.
Light, Science & Applications
|October 11, 2018
Summary
A novel optical measurement technique uses a GOBO projector to cast aperiodic sinusoidal patterns for high-speed 3D surface topography. This method achieves high accuracy and offers advantages over traditional fringe projection for dynamic measurements.
Area of Science:
- Optical Metrology
- Surface Topography Measurement
- High-Speed Imaging
Background:
- Aperiodic sinusoidal patterns projected by GOBO (GOes Before Optics) projectors enable high-speed, accurate optical measurement of dynamic surfaces.
- Previous setups achieved over 50 kHz frame rates for measuring inflating car airbags with ~500 µm 3D point standard deviation.
Purpose of the Study:
- To theoretically investigate and optimize GOBO projection of aperiodic sinusoidal fringes for surface topography measurement.
- To identify key parameters influencing measurement accuracy and determine optimal pattern design through simulation.
- To compare the performance against phase-shifted fringe projection methods.
Main Methods:
- Theoretical investigation of aperiodic sinusoidal fringe projection using GOBO.
- Simulation-based performance analysis to examine influencing parameters and optimize pattern design.
- Experimental verification of theoretical findings and comparison with phase-shifted fringe projection.
Main Results:
- Identified an optimal aperiodic sinusoidal pattern design for maximizing measurement accuracy.
- Demonstrated GOBO projection's capability for high frame rates (>50 kHz) and high accuracy (~500 µm SD).
- Experimental results confirmed theoretical predictions regarding accuracy and advantages.
Conclusions:
- The proposed GOBO projection technique offers significant advantages over conventional fringe projection methods.
- GOBO projectors are cost-effective, easy to build, provide high radiant flux, and operate over a wide spectral range.
- This method is highly suitable for accurate, high-speed 3D surface topography measurements of moving or deforming objects.
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