Concepts of single highspeed-camera photogrammetric 3D measurement systems

2007 ◽  
Author(s):  
Hans-Gerd Maas
Keyword(s):  
3D Measurement ◽  
Measurement Systems

Use of Optical Methods for Dimensional Analysis of Multi-Part Moulds

2014 ◽  
Vol 474 ◽  
pp. 387-392 ◽  
Author(s):  
Radomír Mendřický
Keyword(s):  
Shape Analysis ◽  
Practical Method ◽  
Optical Methods ◽  
Optical Systems ◽  
3D Measurement ◽  
Measurement Systems ◽  
Real Closure ◽  
Traditional Approaches ◽  
3D Digitization ◽  
Methods Of Measurement

The paper deals with the possibilities of using non-contact 3D measurement systems for the digital capture and subsequent dimensional and shape analysis of multi-part forms. The paper illustrates a practical method of the 3D digitization of two-part moulds using a combination of TRITOP and ATOS optical systems. It introduces dimensional control of the cavity of a mould during its real closure and compares this method to traditional methods of measurement. The analyses carried out show the undeniable benefits of these innovative approaches in practice, because the appropriate use of optical methods often enables the detection of the errors of products and tools which would be impossible to detect using traditional approaches.

Comparison and evaluation of correspondence finding methods in 3D measurement systems using fringe projection

2010 ◽  
Author(s):  
Christian Bräuer-Burchardt ◽  
Max Möller ◽  
Christoph Munkelt ◽  
Peter Kühmstedt ◽  
Gunther Notni
Keyword(s):  
Fringe Projection ◽  
3D Measurement ◽  
Measurement Systems

A Contrast of Generation Sinusoidal Fringe Pattern Method Based on Phase Measurement Profilometry

2009 ◽  
Vol 419-420 ◽  
pp. 145-148
Author(s):  
Wan Tao He ◽  
Wen Chao Ren ◽  
Xiang Qian Che ◽  
Shao Sheng Wang
Keyword(s):  
Quality Control ◽  
Reverse Engineering ◽  
Measurement Method ◽  
Fringe Pattern ◽  
Phase Measurement ◽  
Structured Light ◽  
Shape Measurement ◽  
3D Measurement ◽  
Measurement Systems ◽  
Experiment Verification

Optical 3D measurement systems are used in a lot of applications, for instance for quality control and reverse engineering. A structured light active optical 3D measurement method are very often based on projection sinusoidal fringe pattern on the object. The key element of such a shape measurement method is how to generate sinusoidal fringe pattern. The purpose of this paper is to review the method of generation sinusoidal fringe pattern and contrast the two chief method from the specific viewpoint based phase measurement profilmetry. Experiment verification of the performance of each generation method is provided and finally some suggestions on generation method for phase measurement profilometry applications is offered.

Rapid prototyping with optical 3D measurement systems

1994 ◽  
Author(s):  
J. Gaessler ◽  
G. N. Blount ◽  
R. M. Jones
Keyword(s):  
Rapid Prototyping ◽  
3D Measurement ◽  
Measurement Systems

scholarly journals Comparison of form measurement results for optical aspheres and freeform surfaces

2022 ◽  
Author(s):  
Ines Fortmeier ◽  
Michael Schulz
Keyword(s):  
Measurement Data ◽  
Evaluation Procedure ◽  
3D Measurement ◽  
Measurement Point ◽  
Freeform Surfaces ◽  
Measurement Systems ◽  
Evaluation Strategies ◽  
Comparison Results ◽  
Measurement Results ◽  
Different Levels

Abstract Comparing form measurement data for aspheres and freeform surfaces is an important tool for ensuring the quality and functionality of the devices used to take such measurements and may also allow the underlying measurement methods to be evaluated. However, comparing the highly accurate form measurements of such complex surfaces is a demanding task. It is difficult to analyze measurement results whose accuracies are in the range of several tens of nanometers root-mean-square, especially when comparing data with different, and anisotropic distributions of the 3D measurement points on the surface under test. In this paper, we investigate eight different 3D measurement point distributions that are typical of highly accurate measurement systems currently in use and demonstrate the effects of these distributions on the comparison results by using virtually generated data and applying different evaluation strategies. The results show that, for the examples investigated, the different 3D measurement point distributions can yield different levels of accuracy for the comparison. Furthermore, an improved evaluation procedure is proposed and recommendations on how to significantly reduce the influence of the different 3D measurement point distributions on the comparison result are given. A method of employing virtually generated test data is presented that may be generalized in order to further improve and validate future comparison methods.

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