scholarly journals Laser Scanning for the Evaluation of Historic Structures

2016 ◽  
pp. 807-835
Author(s):  
Belen Riveiro ◽  
Borja Conde-Carnero ◽  
Pedro Arias-Sánchez
Keyword(s):  
Reverse Engineering ◽  
Laser Scanning ◽  
Structural Engineering ◽  
Geometric Characterization ◽  
Mobile Platforms ◽  
Current State ◽  
Laser Scanners ◽  
Historic Structures ◽  
Structural Calculation

In the last times, laser scanning is being massively used to perform reverse engineering of different built-up structures, both modern and historic ones, providing detailed geometry. This chapter presents an introduction to the technology so topics like the physic fundamentals of laser scanners, instrumentation (static and mobile platforms) and the advantages of each method. This chapter aims to illustrate the optimal application of laser scanning to the field of structural engineering in order to ease the adoption of the technology by engineers outside of the geomatic domain. The chapter presents a review of different case studies where laser scanning allowed very precise and very detailed geometric characterization of historic structures in order to obtain an objective diagnosis of their current state. Also, methodologies that permit the implementation of laser scanning products in structural calculation will be shown. Finally, up-to-date trends, mainly related to automatic and intelligent processing, of laser scanning data in historic structures are discussed.

Laser Scanning for the Evaluation of Historic Structures

2015 ◽  
pp. 765-793 ◽  
Author(s):  
Belen Riveiro ◽  
Borja Conde-Carnero ◽  
Pedro Arias-Sánchez
Keyword(s):  
Reverse Engineering ◽  
Laser Scanning ◽  
Structural Engineering ◽  
Geometric Characterization ◽  
Mobile Platforms ◽  
Current State ◽  
Laser Scanners ◽  
Historic Structures ◽  
Structural Calculation

In the last times, laser scanning is being massively used to perform reverse engineering of different built-up structures, both modern and historic ones, providing detailed geometry. This chapter presents an introduction to the technology so topics like the physic fundamentals of laser scanners, instrumentation (static and mobile platforms) and the advantages of each method. This chapter aims to illustrate the optimal application of laser scanning to the field of structural engineering in order to ease the adoption of the technology by engineers outside of the geomatic domain. The chapter presents a review of different case studies where laser scanning allowed very precise and very detailed geometric characterization of historic structures in order to obtain an objective diagnosis of their current state. Also, methodologies that permit the implementation of laser scanning products in structural calculation will be shown. Finally, up-to-date trends, mainly related to automatic and intelligent processing, of laser scanning data in historic structures are discussed.

scholarly journals A sensor skid for precise 3D modeling of production lines

2014 ◽  
Vol II-5 ◽  
pp. 117-122 ◽  
Author(s):  
J. Elseberg ◽  
D. Borrmann ◽  
J. Schauer ◽  
A. Nüchter ◽  
D. Koriath ◽  
...  
Keyword(s):  
3D Modeling ◽  
Production Line ◽  
Laser Scanning ◽  
Terrestrial Laser Scanning ◽  
Point Clouds ◽  
Production Lines ◽  
3D Point Clouds ◽  
Laser Scanners ◽  
Rapid Characterization

Motivated by the increasing need of rapid characterization of environments in 3D, we designed and built a sensor skid that automates the work of an operator of terrestrial laser scanners. The system combines terrestrial laser scanning with kinematic laser scanning and uses a novel semi-rigid SLAMmethod. It enables us to digitize factory environments without the need to stop production. The acquired 3D point clouds are precise and suitable to detect objects that collide with items moved along the production line.

scholarly journals UNDERSTANDING THE EFFECTS OF DOCUMENTATION DETAIL ON DIAGNOSTICS OF HISTORIC STRUCTURES

2019 ◽  
Vol XLII-2/W15 ◽  
pp. 843-848
Author(s):  
R. K. Napolitano ◽  
M. Hess ◽  
B. Glisic
Keyword(s):  
Laser Scanning ◽  
Distinct Element ◽  
Three Dimensional ◽  
Level Of Detail ◽  
Laser Scanners ◽  
Historic Structures ◽  
New Construction ◽  
Distinct Element Modelling ◽  
Three Dimensional Models

<p><strong>Abstract.</strong> Before reinforcements or new construction are added to historic structures, it is important to understand how the existing damage could have arisen. Often to do this, documentation methods such as laser scanning and photogrammetry are used to capture the existing conditions and physics-based models are used to simulate the response of a facsimile structure to various responses. Something that varies quite a bit though is the level of detail used to capture the existing conditions as well as the level of detail used to represent the structure during physics-based modelling. This paper aims to understand the effects of documentation detail on diagnostics of historic structures. To do this, two masonry structures were documented with laser scanners, photographs, and thermal images. For each case study, three-dimensional models of varying fidelity were generated based on the results of simulation. The response of these models to loading conditions was then calculated using a physics-based modelling technique called finite-distinct element modelling. The results for each case study are compared to understand the impacts of geometry on diagnostics; discussion about future tools to augment current practices is included.</p>

Software suite for determining the tilts of tower-type structures according to terrestrial laser scanning

2020 ◽  
Vol 961 (7) ◽  
pp. 2-7
Author(s):  
A.V. Zubov ◽  
N.N. Eliseeva
Keyword(s):  
Laser Scanning ◽  
Optimization Problems ◽  
Optimization Methods ◽  
User Participation ◽  
Software Suite ◽  
Current State ◽  
Visual Basic For Applications ◽  
Operational Data ◽  
Theoretical Developments

The authors describe a software suite for determining tilt degrees of tower-type structures according to ground laser scanning indication. Defining the tilt of the pipe is carried out with a set of measured data through approximating the sections by circumferences. They are constructed using one of the simplest search engine optimization methods (evolutionary algorithm). Automatic filtering the scan of the current section from distorting data is performed by the method of assessing the quality of models constructed with that of least squares. The software was designed using Visual Basic for Applications. It contains several blocks (subprograms), with each of them performing a specific task. The developed complex enables obtaining operational data on the current state of the object with minimal user participation in the calculation process. The software suite is the result of practical implementing theoretical developments on the possibilities of using search methods at solving optimization problems in geodetic practice.

scholarly journals Melite Civitas Romana in 3D: Virtualization Project of the Archaeological Park and Museum of the Domus Romana of Rabat, Malta

2021 ◽  
Vol 7 (1) ◽  
pp. 51-83
Author(s):  
Davide Tanasi ◽  
Stephan Hassam ◽  
Kaitlyn Kingsland ◽  
Paolo Trapani ◽  
Matthew King ◽  
...  
Keyword(s):  
Laser Scanning ◽  
Structured Light ◽  
Terrestrial Laser Scanning ◽  
Archaeological Site ◽  
South Florida ◽  
Virtual Museum ◽  
Current State ◽  
Structured Light Scanning ◽  
The University ◽  
Archaeological Excavations

Abstract The archaeological site of the Domus Romana in Rabat, Malta was excavated almost 100 years ago yielding artefacts from the various phases of the site. The Melite Civitas Romana project was designed to investigate the domus, which may have been the home of a Roman Senator, and its many phases of use. Pending planned archaeological excavations designed to investigate the various phases of the site, a team from the Institute for Digital Exploration from the University of South Florida carried out a digitization campaign in the summer of 2019 using terrestrial laser scanning and aerial digital photogrammetry to document the current state of the site to provide a baseline of documentation and plan the coming excavations. In parallel, structured light scanning and photogrammetry were used to digitize 128 artefacts in the museum of the Domus Romana to aid in off-site research and create a virtual museum platform for global dissemination.

scholarly journals Simple Design Solution for Harsh Operating Conditions: Redesign of Conveyor Transfer Station with Reverse Engineering and DEM Simulations

Energies ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 4008
Author(s):  
Błażej Doroszuk ◽  
Robert Król ◽  
Jarosław Wajs
Keyword(s):  
Reverse Engineering ◽  
Laser Scanning ◽  
Design For Manufacturing ◽  
Operating Conditions ◽  
Design Solution ◽  
Dem Simulations ◽  
Transfer Station ◽  
Transfer Stations ◽  
Dem Model ◽  
Current Operating

This paper addresses the problem of conveyor transfer station design in harsh operating conditions, aiming to identify and eliminate a failure phenomenon which interrupts aggregate supply. The analyzed transfer station is located in a Polish granite quarry. The study employs laser scanning and reverse engineering methods to map the existing transfer station and its geometry. Next, a discrete element method (DEM) model of granite aggregate has been created and used for simulating current operating conditions. The arch formation has been identified as the main reason for breakdowns. Alternative design solutions for transfer stations were tested in DEM simulations. The most uncomplicated design for manufacturing incorporated an impact plate, and a straight chute has been selected as the best solution. The study also involved identifying areas of the new station most exposed to wear phenomena. A new transfer point was implemented in the quarry and resolved the problem of blockages.

Characterization of Beldi chicken and turkeys in rural poultry flocks of Morocco. Current state and future outlook

2001 ◽  
Vol 31 ◽  
pp. 87-95 ◽  
Author(s):  
K. Benabdeljelil ◽  
T. Arfaoui
Keyword(s):  
Rural Areas ◽  
Sexual Maturity ◽  
Phenotypic Variability ◽  
Future Outlook ◽  
Current State ◽  
Production Improvement ◽  
Rural Poultry

SummaryThe main characteristics of Beldi (meaning “native” in Arabic) poultry raised in rural areas were studied in the Khenifra Region through extensive surveys.Beldi chickens have large phenotypic variability. Black, brown, grey and white colours, pure or mixed, are frequently observed in chickens' featherings while turkeys are predominantly bronze. Plumage types were fairly homogeneous in both species. Single combs and dented combs were respectively predominant in chicken hens and roosters.Sexual maturity was reached at 154 days for roosters, 168 for hens in chicken, around 217 days for toms and 231 for turkey hens. The age at first egg averaged 5.8 months for hens and 8.4 months for turkey hens. The number of eggs laid per hen per year was 78 for chicken and 69 for turkey. Hatchability rate was 78 and 80 percent for chicken and turkeys, respectively. Diseases were the main cause of mortality, which could affect up to 77 percent of chicken flocks.Few preliminary urgent steps for the conservation of Beldi poultry are discussed with other production improvement proposals.

scholarly journals Laser scanning cytometry in the characterization of the proapoptotic effects of transiently transfected genes in cerebellar granule neurons

2006 ◽  
Vol 69A (11) ◽  
pp. 1114-1122 ◽  
Author(s):  
Brendan Bingham ◽  
Smita Kotnis ◽  
Barbara McHendry-Rinde ◽  
Ru Shen ◽  
Andrew Wood ◽  
...  
Keyword(s):  
Laser Scanning ◽  
Cerebellar Granule Neurons ◽  
Granule Neurons ◽  
Cerebellar Granule ◽  
Laser Scanning Cytometry
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