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Three-dimensional sensing of rough surfaces by coherence radar.
Applied Optics
|August 20, 2010
Summary
We developed a novel coherence radar 3D sensor for rough surfaces. This system achieves high accuracy, limited only by surface roughness, enabling measurements in narrow spaces.
Area of Science:
- Optical Metrology
- Interferometry
- 3D Sensing
Background:
- Conventional optical 3D sensing systems face limitations in depth accuracy due to aperture size.
- Probing narrow crevices and holes with high accuracy remains a challenge for existing technologies.
Purpose of the Study:
- To introduce a new three-dimensional sensor for measuring rough object surfaces.
- To overcome the aperture limitations of conventional optical systems for enhanced depth accuracy.
Main Methods:
- Utilizing a Michelson interferometer configuration.
- Employing a light source with a short coherence length.
- Detecting interference within speckles during depth scanning, termed coherence radar.
Main Results:
- The sensor's accuracy is primarily limited by the object's surface roughness, not the aperture.
- High accuracy measurements are achievable even with a small aperture.
- The system allows for probing narrow crevices and holes effectively.
Conclusions:
- The developed coherence radar sensor offers a significant advancement in 3D measurement of rough surfaces.
- Its ability to provide high accuracy with a small aperture opens new possibilities for inspecting complex geometries.
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