Abstract
Structured light projection techniques are well-established optical methods for contactless and nondestructive three-dimensional (3D) measurements. Most systems operate in the visible wavelength range (VIS) due to commercially available projection and detection technology. For example, the 3D reconstruction can be done with a stereo-vision setup by finding corresponding pixels in both cameras followed by triangulation. Problems occur, if the properties of object materials disturb the measurements, which are based on the measurement of diffuse light reflections. For example, there are existing materials in the VIS range that are too transparent, translucent, high absorbent, or reflective and cannot be recorded properly. To overcome these challenges, we present an alternative thermal approach that operates in the infrared (IR) region of the electromagnetic spectrum. For this purpose, we used two cooled mid-wave (MWIR) cameras (3–5 μm) to detect emitted heat patterns, which were introduced by a CO2 laser. We present a thermal 3D system based on a GOBO (GOes Before Optics) wheel projection unit and first 3D analyses for different system parameters and samples. We also show a second alternative approach based on an incoherent (heat) source, to overcome typical disadvantages of high-power laser-based systems, such as industrial health and safety considerations, as well as high investment costs. Thus, materials like glass or fiber-reinforced composites can be measured contactless and without the need of additional paintings.
Acknowledgments
The part of this research at Ilmenau University of Technology was supported by the German Federal Ministry of Education and Research (BMBF) under grant no. 03ZZ0422.
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©2016 THOSS Media & De Gruyter
Artikel in diesem Heft
- Cover and Frontmatter
- Community
- Conference Notes
- Conference Calendar
- News from the European Optical Society EOS
- Topical Issue: Optical 3D Sensing
- Review Articles
- High-speed optical 3D sensing and its applications
- Infrared deflectometry for the inspection of diffusely specular surfaces
- Multi-scale referencing and coordinate unification of optical sensors in multi-axis machines
- Research Articles
- 3D shape measurement with thermal pattern projection
- A new form measurement system based on subaperture stitching with a line-scanning interferometer
- Evaluation of pixel-wise geometric constraint-based phase-unwrapping method for low signal-to-noise-ratio (SNR) phase
- Single-shot phase-measuring deflectometry for cornea measurement
- Modeling of imaging fiber bundles and adapted signal processing for fringe projection
- Noncontact three-dimensional quantitative profiling of fast aspheric lenses by optical coherence tomography
- Tutorial
- Aspherics in spectacle lenses
- Research Article
- Structural noise tolerance of photonic crystal optical properties
Artikel in diesem Heft
- Cover and Frontmatter
- Community
- Conference Notes
- Conference Calendar
- News from the European Optical Society EOS
- Topical Issue: Optical 3D Sensing
- Review Articles
- High-speed optical 3D sensing and its applications
- Infrared deflectometry for the inspection of diffusely specular surfaces
- Multi-scale referencing and coordinate unification of optical sensors in multi-axis machines
- Research Articles
- 3D shape measurement with thermal pattern projection
- A new form measurement system based on subaperture stitching with a line-scanning interferometer
- Evaluation of pixel-wise geometric constraint-based phase-unwrapping method for low signal-to-noise-ratio (SNR) phase
- Single-shot phase-measuring deflectometry for cornea measurement
- Modeling of imaging fiber bundles and adapted signal processing for fringe projection
- Noncontact three-dimensional quantitative profiling of fast aspheric lenses by optical coherence tomography
- Tutorial
- Aspherics in spectacle lenses
- Research Article
- Structural noise tolerance of photonic crystal optical properties