Towards online UAS‐based photogrammetric measurements for 3D metrology inspection

2020 ◽  
Vol 35 (172) ◽  
pp. 467-486
Author(s):  
Fabio Menna ◽  
Erica Nocerino ◽  
Fabio Remondino ◽  
Luca Saladino ◽  
Luigi Berri
Keyword(s):  
3D Metrology

AFM Integrated with SEM/FIB for Complete 3D Metrology Measurements

2014 ◽  
Vol 20 (S3) ◽  
pp. 1112-1113 ◽  
Author(s):  
Aaron Lewis ◽  
A. Komissar ◽  
A. Ignatov ◽  
Oleg Fedoroyov ◽  
E. Maayan ◽  
...  
Keyword(s):  
3D Metrology

Stereopolis II: A multi-purpose and multi-sensor 3D mobile mapping system for street visualisation and 3D metrology

2014 ◽  
pp. 69-79
Author(s):  
Nicolas Paparoditis ◽  
Jean-Pierre Papelard ◽  
Bertrand Cannelle ◽  
Alexandre Devaux ◽  
Bahman Soheilian ◽  
...  
Keyword(s):  
Software As A Service ◽  
Mobile Mapping ◽  
Mapping System ◽  
Mobile Mapping System ◽  
Grand Public ◽  
3D Metrology

Nous présentons dans cet article un système de numérisation mobile 3D hybride laser-image qui permet d'acquérir des infrastructures de données spatiales répondant aux besoins d'applications diverses allant de navigations multimédia immersives jusqu'à de la métrologie 3D à travers le web. Nous détaillons la conception du système, ses capteurs, son architecture et sa calibration, ainsi qu'un service web offrant la possibilité de saisir en 3D via un outil de type SaaS (Software as a Service), permettant à tout un chacun d'enrichir ses propres bases de données à hauteur de ses besoins.Nous abordons également l'anonymisation des données, à savoir la détection et le floutage de plaques d'immatriculation, qui est est une étape inévitable pour la diffusion de ces données sur Internet via des applications grand public.

3D metrology system based on a bi-directional OLED microdisplay

2012 ◽  
Author(s):  
Constanze Grossmann ◽  
Ute Gawronski ◽  
Martin Breitbarth ◽  
Gunther Notni ◽  
Andreas Tünnermann
Keyword(s):  
3D Metrology ◽  
Metrology System

3D metrology system with internal calibration

2010 ◽  
Author(s):  
D. Härter ◽  
C. Müller ◽  
H. Reinecke
Keyword(s):  
Internal Calibration ◽  
3D Metrology ◽  
Metrology System

3D Measuring of Complex Automotive Parts by Multiple Laser Scanning

2013 ◽  
Vol 371 ◽  
pp. 519-523 ◽  
Author(s):  
Adrian Catalin Voicu ◽  
Ion Gheorghe Gheorghe ◽  
Liliana Laura Badita ◽  
Adriana Cirstoiu
Keyword(s):  
Computer Games ◽  
Laser Scanning ◽  
Three Dimensional ◽  
3D Scanning ◽  
Single Step ◽  
Graph Representation ◽  
Production Environment ◽  
Manufacturing Networks ◽  
Laser Systems ◽  
3D Metrology

Three-dimensional scanning is available for more than 15 years, however there are few that have heard of it and as few people know the applications of this technology. 3D scanning is also known as 3D digitizing, the name coming from the fact that this is a process that uses a contact or non-contact digitizing probe to capture the objects form and recreate them in a virtual workspace through a very dense network of points (xyz) as a 3D graph representation. Based on this information have been developed many new applications in many fields - computer games industry, prosthetics or forensic medicine, the arts and culture area - but the most common area where scanning systems are used remains the automotive industry, aircraft and consumer goods. Most automotive manufacturers currently use 3D metrology based on optical or laser systems to validate products quality. The pieces are initially measured by 3D scanning then they are compared with the designed model (CAD file) using a specialized software. By this comparison producer can interfere very quickly in the manufacturing process to remove the cause of defects, this technique being called Reverse Engineering (RE). The overall accuracy of a 3D acquisition system depends above all on the sensors precision and on the acquisition device (acquisition with contact) or acquisition structure (acquisition without contact). This accuracy may vary from micron to millimeter and the acquisitions size from a few points to several thousand points per second. In a perfect world or in an integrated production environment, 3D measuring systems should be able to measure all the necessary parameters in a single step without errors, and to render the results in the same way to the manufacturing networks equipped with computers, in formats useful for machines control and processes management.

scholarly journals Determination of the coefficient of expansion of a carbon tube and its assembly for thermal compensation of metrological structures

2019 ◽  
Author(s):  
Salma EL ASMAI ◽  
François HENNEBELLE ◽  
Thierry COOREVITS ◽  
Jean-François FONTAINE
Keyword(s):  
Thermal Expansion ◽  
Composite Materials ◽  
Production Efficiency ◽  
Coefficient Of Thermal Expansion ◽  
Thermal Expansion Coefficients ◽  
Carbon Tube ◽  
Interesting Approach ◽  
Measurement Uncertainties ◽  
3D Metrology

Composite materials are increasingly used in 3D metrology devices. Their use is justified by their interesting mechanical properties including their low density and good rigidity but especially their low coefficient of thermal expansion. In fact, in order to improve production efficiency, companies nowadays integrate more and more control equipment directly in situ. These are then subject to thermal variations. The use of composite materials is an interesting approach. However, in some cases, the lack of knowledge of their coefficient of thermal expansion and their behavior might increase measurement uncertainties. The objective is to study the thermal behavior of a carbon tube alone and the same tube with aluminium fixing elements at its extremities, in order to determine the coefficients of expansion of the carbon alone and to quantify the influence of the fixation with aluminium elements. This experiment makes it possible to directly compensate the dimensional variations of the metrological structure depending on the temperature variations and thus to limit measurement uncertainties. The thermal expansion coefficients of the carbon tube and its assembly are determined by measuring relative variations in height with a ZERODUR® reference bar. The whole is positioned in a climatic chamber. *

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