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3D shape measurement with thermal pattern projection

  • Anika Brahm EMAIL logo , Edgar Reetz , Simon Schindwolf , Martin Correns , Peter Kühmstedt and Gunther Notni
Published/Copyright: January 4, 2017
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Advanced Optical Technologies
From the journal Advanced Optical Technologies Volume 5 Issue 5-6

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.

Keywords: infrared imaging; thermal imaging; thermal pattern projection; three-dimensional shape measurement
OCIS code: 110.3080 infrared imaging; 120.3940 metrology; 120.4820 optical systems; 110.6820 thermal imaging; 150.6910 three-dimensional sensing

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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Received: 2016-9-22
Accepted: 2016-11-8
Published Online: 2017-1-4
Published in Print: 2016-12-1

©2016 THOSS Media & De Gruyter

Articles in the same Issue

  1. Cover and Frontmatter
  2. Community
  3. Conference Notes
  4. Conference Calendar
  5. News from the European Optical Society EOS
  6. Topical Issue: Optical 3D Sensing
  7. Review Articles
  8. High-speed optical 3D sensing and its applications
  9. Infrared deflectometry for the inspection of diffusely specular surfaces
  10. Multi-scale referencing and coordinate unification of optical sensors in multi-axis machines
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  12. 3D shape measurement with thermal pattern projection
  13. A new form measurement system based on subaperture stitching with a line-scanning interferometer
  14. Evaluation of pixel-wise geometric constraint-based phase-unwrapping method for low signal-to-noise-ratio (SNR) phase
  15. Single-shot phase-measuring deflectometry for cornea measurement
  16. Modeling of imaging fiber bundles and adapted signal processing for fringe projection
  17. Noncontact three-dimensional quantitative profiling of fast aspheric lenses by optical coherence tomography
  18. Tutorial
  19. Aspherics in spectacle lenses
  20. Research Article
  21. Structural noise tolerance of photonic crystal optical properties
https://doi.org/10.1515/aot-2016-0052
Keywords for this article
infrared imaging; thermal imaging; thermal pattern projection; three-dimensional shape measurement

Articles in the same Issue

  1. Cover and Frontmatter
  2. Community
  3. Conference Notes
  4. Conference Calendar
  5. News from the European Optical Society EOS
  6. Topical Issue: Optical 3D Sensing
  7. Review Articles
  8. High-speed optical 3D sensing and its applications
  9. Infrared deflectometry for the inspection of diffusely specular surfaces
  10. Multi-scale referencing and coordinate unification of optical sensors in multi-axis machines
  11. Research Articles
  12. 3D shape measurement with thermal pattern projection
  13. A new form measurement system based on subaperture stitching with a line-scanning interferometer
  14. Evaluation of pixel-wise geometric constraint-based phase-unwrapping method for low signal-to-noise-ratio (SNR) phase
  15. Single-shot phase-measuring deflectometry for cornea measurement
  16. Modeling of imaging fiber bundles and adapted signal processing for fringe projection
  17. Noncontact three-dimensional quantitative profiling of fast aspheric lenses by optical coherence tomography
  18. Tutorial
  19. Aspherics in spectacle lenses
  20. Research Article
  21. Structural noise tolerance of photonic crystal optical properties
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