Details
| Original language | English |
|---|---|
| Title of host publication | Optical Measurement Systems for Industrial Inspection XII |
| Editors | Peter Lehmann, Wolfgang Osten, Armando Albertazzi Goncalves |
| Publisher | SPIE |
| ISBN (electronic) | 9781510643987 |
| Publication status | Published - 20 Jun 2021 |
| Event | Optical Measurement Systems for Industrial Inspection XII 2021 - Virtual, Online, Germany Duration: 21 Jun 2021 → 25 Jun 2021 |
Publication series
| Name | Proceedings of SPIE - The International Society for Optical Engineering |
|---|---|
| Volume | 11782 |
| ISSN (Print) | 0277-786X |
| ISSN (electronic) | 1996-756X |
Abstract
The 3D measurement of the interior of hollow technical bodies is still a challenge for state-of-the-art measurement systems. This is especially true for complex industrial free-form objects inside confined spaces. Fringe projection enables accurate and fast 3D measurements of object surfaces. To fulfill the task of geometric inspection of confined spaces, we have developed an endoscopic and flexible fringe projection system. The fringe patterns are generated with a RGB LED projector. Fibre-coupling of the structured light is achieved by using a microscope lens and bundle of coherent image fibres. A compact sensor head can be achieved by using a micro-objective for projecting the fringes and a Chip-on-Tip camera to capture the images. A micro lens with a diameter of 1.7 mm was used as the projector lens and a 2 megapixel 1/6” chip was used as the image sensor. By synchronizing the projector with the camera, the system is capable of capturing up to 10 grayscale patterns per second. The measurement volumes result to approximately 20 × 13 × 4 mm3. Typically, the measurement time is in the range of 1 - 3 s, depending on the number of projected images. Measurements on a 50 µm step standard confirmed that a measurement uncertainty of less than 29.4 ± 3.2 µm is achieved with this system. Mounted on a carrier system, the presented fringe projection system offers the possibility to enter confined areas and perform high-precision 3D measurements.
Keywords
- Borescope, Fringe projection, Inspection, Measurement, Optical measurement, Structured light
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Physics and Astronomy(all)
- Condensed Matter Physics
- Computer Science(all)
- Computer Science Applications
- Mathematics(all)
- Applied Mathematics
- Engineering(all)
- Electrical and Electronic Engineering
Cite this
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- Harvard
- Apa
- Vancouver
- BibTeX
- RIS
Optical Measurement Systems for Industrial Inspection XII. ed. / Peter Lehmann; Wolfgang Osten; Armando Albertazzi Goncalves. SPIE, 2021. 1178214 (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 11782).
Research output: Chapter in book/report/conference proceeding › Conference contribution › Research › peer review
}
TY - GEN
T1 - On the development of a flexible borescope fringe projection system
AU - v. Wrangel, Moritz
AU - Kästner, Markus
AU - Reithmeier, Eduard
PY - 2021/6/20
Y1 - 2021/6/20
N2 - The 3D measurement of the interior of hollow technical bodies is still a challenge for state-of-the-art measurement systems. This is especially true for complex industrial free-form objects inside confined spaces. Fringe projection enables accurate and fast 3D measurements of object surfaces. To fulfill the task of geometric inspection of confined spaces, we have developed an endoscopic and flexible fringe projection system. The fringe patterns are generated with a RGB LED projector. Fibre-coupling of the structured light is achieved by using a microscope lens and bundle of coherent image fibres. A compact sensor head can be achieved by using a micro-objective for projecting the fringes and a Chip-on-Tip camera to capture the images. A micro lens with a diameter of 1.7 mm was used as the projector lens and a 2 megapixel 1/6” chip was used as the image sensor. By synchronizing the projector with the camera, the system is capable of capturing up to 10 grayscale patterns per second. The measurement volumes result to approximately 20 × 13 × 4 mm3. Typically, the measurement time is in the range of 1 - 3 s, depending on the number of projected images. Measurements on a 50 µm step standard confirmed that a measurement uncertainty of less than 29.4 ± 3.2 µm is achieved with this system. Mounted on a carrier system, the presented fringe projection system offers the possibility to enter confined areas and perform high-precision 3D measurements.
AB - The 3D measurement of the interior of hollow technical bodies is still a challenge for state-of-the-art measurement systems. This is especially true for complex industrial free-form objects inside confined spaces. Fringe projection enables accurate and fast 3D measurements of object surfaces. To fulfill the task of geometric inspection of confined spaces, we have developed an endoscopic and flexible fringe projection system. The fringe patterns are generated with a RGB LED projector. Fibre-coupling of the structured light is achieved by using a microscope lens and bundle of coherent image fibres. A compact sensor head can be achieved by using a micro-objective for projecting the fringes and a Chip-on-Tip camera to capture the images. A micro lens with a diameter of 1.7 mm was used as the projector lens and a 2 megapixel 1/6” chip was used as the image sensor. By synchronizing the projector with the camera, the system is capable of capturing up to 10 grayscale patterns per second. The measurement volumes result to approximately 20 × 13 × 4 mm3. Typically, the measurement time is in the range of 1 - 3 s, depending on the number of projected images. Measurements on a 50 µm step standard confirmed that a measurement uncertainty of less than 29.4 ± 3.2 µm is achieved with this system. Mounted on a carrier system, the presented fringe projection system offers the possibility to enter confined areas and perform high-precision 3D measurements.
KW - Borescope
KW - Fringe projection
KW - Inspection
KW - Measurement
KW - Optical measurement
KW - Structured light
UR - http://www.scopus.com/inward/record.url?scp=85109361002&partnerID=8YFLogxK
U2 - 10.1117/12.2593019
DO - 10.1117/12.2593019
M3 - Conference contribution
AN - SCOPUS:85109361002
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - Optical Measurement Systems for Industrial Inspection XII
A2 - Lehmann, Peter
A2 - Osten, Wolfgang
A2 - Goncalves, Armando Albertazzi
PB - SPIE
T2 - Optical Measurement Systems for Industrial Inspection XII 2021
Y2 - 21 June 2021 through 25 June 2021
ER -