Abstract
Controlling the geometric accuracy of manufactured products is seen as an important issue, since it affects both production costs and quality. Optical measurement technology has been found suitable for various geometric control applications, and laser rangefinder devices in particular are now being used to measure large objects and structures. This thesis describes the development of a concept of CAD model-based automated 3D measurement and the evaluation of its feasibility in cases drawn from industrial needs. Automated 3D measurement can be seen as comprising two steps: measurement planning and measurement execution. Measurement planning takes place interactively using the information contained in the CAD model of the object, to yield a measurement plan in a form readable by the measurement system. In the second step, the planned measurement sequence is executed automatically under computer control using sensory feedback. The analysis and use of the results, e.g. for quality control or for guiding parts assembly, which is naturally the following step, is touched on only briefly in this work. The concept was evaluated by implementing a graphical measurement planning tool and two automatic measurement systems. The tool was built using the development environment of a commercial CAD package, which ensured compatibility with existing CAD data. The experimental automatic measurement systems were based on optical co-ordinate measuring devices and were equipped with vision systems for sensory feedback. The operation chain from CAD model-based measurement planning to comparison between the measured and designed geometries was demonstrated. Successful experiments with automatic operation controlled by the measurement plan and vision guidance were carried out and the key performance criteria were met.
| Original language | English |
|---|---|
| Qualification | Doctor Degree |
| Awarding Institution |
|
| Award date | 14 Mar 1996 |
| Place of Publication | Espoo |
| Publisher | |
| Print ISBNs | 951-38-4956-2 |
| Publication status | Published - 1 Dec 1997 |
| MoE publication type | G5 Doctoral dissertation (article) |
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Keywords
- Accuracy
- CAD
- Geometric control
- Inspection
- Lasers
- Machine vision
- Measurement
- Models
- Optical measurement
- Planning
- Three dimensional systems
Cite this
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CAD model-based planning and vision guidance for optical 3D co-ordinate measurement : Dissertation. / Ailisto, Heikki.
Espoo : VTT Technical Research Centre of Finland, 1997. 70 p.Research output: Thesis › Dissertation › Collection of Articles
TY - THES
T1 - CAD model-based planning and vision guidance for optical 3D co-ordinate measurement
T2 - Dissertation
AU - Ailisto, Heikki
PY - 1997/12/1
Y1 - 1997/12/1
N2 - Controlling the geometric accuracy of manufactured products is seen as an important issue, since it affects both production costs and quality. Optical measurement technology has been found suitable for various geometric control applications, and laser rangefinder devices in particular are now being used to measure large objects and structures. This thesis describes the development of a concept of CAD model-based automated 3D measurement and the evaluation of its feasibility in cases drawn from industrial needs. Automated 3D measurement can be seen as comprising two steps: measurement planning and measurement execution. Measurement planning takes place interactively using the information contained in the CAD model of the object, to yield a measurement plan in a form readable by the measurement system. In the second step, the planned measurement sequence is executed automatically under computer control using sensory feedback. The analysis and use of the results, e.g. for quality control or for guiding parts assembly, which is naturally the following step, is touched on only briefly in this work. The concept was evaluated by implementing a graphical measurement planning tool and two automatic measurement systems. The tool was built using the development environment of a commercial CAD package, which ensured compatibility with existing CAD data. The experimental automatic measurement systems were based on optical co-ordinate measuring devices and were equipped with vision systems for sensory feedback. The operation chain from CAD model-based measurement planning to comparison between the measured and designed geometries was demonstrated. Successful experiments with automatic operation controlled by the measurement plan and vision guidance were carried out and the key performance criteria were met.
AB - Controlling the geometric accuracy of manufactured products is seen as an important issue, since it affects both production costs and quality. Optical measurement technology has been found suitable for various geometric control applications, and laser rangefinder devices in particular are now being used to measure large objects and structures. This thesis describes the development of a concept of CAD model-based automated 3D measurement and the evaluation of its feasibility in cases drawn from industrial needs. Automated 3D measurement can be seen as comprising two steps: measurement planning and measurement execution. Measurement planning takes place interactively using the information contained in the CAD model of the object, to yield a measurement plan in a form readable by the measurement system. In the second step, the planned measurement sequence is executed automatically under computer control using sensory feedback. The analysis and use of the results, e.g. for quality control or for guiding parts assembly, which is naturally the following step, is touched on only briefly in this work. The concept was evaluated by implementing a graphical measurement planning tool and two automatic measurement systems. The tool was built using the development environment of a commercial CAD package, which ensured compatibility with existing CAD data. The experimental automatic measurement systems were based on optical co-ordinate measuring devices and were equipped with vision systems for sensory feedback. The operation chain from CAD model-based measurement planning to comparison between the measured and designed geometries was demonstrated. Successful experiments with automatic operation controlled by the measurement plan and vision guidance were carried out and the key performance criteria were met.
KW - Accuracy
KW - CAD
KW - Geometric control
KW - Inspection
KW - Lasers
KW - Machine vision
KW - Measurement
KW - Models
KW - Optical measurement
KW - Planning
KW - Three dimensional systems
UR - http://www.scopus.com/inward/record.url?scp=27144557754&partnerID=8YFLogxK
M3 - Dissertation
SN - 951-38-4956-2
T3 - VTT Publications
PB - VTT Technical Research Centre of Finland
CY - Espoo
ER -