scholarly journals Characterization of Laser Scanners for Detecting Cracks for Post-Earthquake Damage Inspection

2013 ◽  
Author(s):  
Engin Burak Anil ◽  
Burcu Akinci ◽  
James H. Garrett ◽  
Ozgur Kurc
Keyword(s):  
Earthquake Damage ◽  
Laser Scanners

Inspection Technology for F-Theta Lens: Practices and Discussions

2007 ◽  
Vol 364-366 ◽  
pp. 1191-1196 ◽  
Author(s):  
Hua Li ◽  
Suet To ◽  
Ling Bao Kong ◽  
Chi Fai Cheung ◽  
Wing Bun Lee
Keyword(s):  
Measurement Methods ◽  
Freeform Surface ◽  
Measurement Technology ◽  
Measuring Instruments ◽  
Freeform Surfaces ◽  
Existing Problems ◽  
Laser Scanners ◽  
Pros And Cons ◽  
Lens Surface

This paper presents the inspection technology for a freeform surface component which is named F-theta lens. F-theta lens is widely used in laser scanners, printers, etc. Freeform characterization is one of the main approaches to verify the manufacturing precision of freeform surface. At present, there is still a lack of techniques for the characterization of freeform surfaces. This study aimed to explore some approaches to inspect freeform surfaces. Two types of measurement methods, namely contact and non-contact measurement methods, are employed to measure the F-theta lens surface. The pros and cons, the existing problems, different applications and areas for improvement of the two methods are discussed. A series of advanced measuring instruments are used in the measurement process. A brief description of measurement mechanisms of these instruments is also presented. As a whole, this paper contributes to the development of the precision measurement technology for optical freeform surfaces.

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 Reappraising a wartime earthquake: the October 3, 1943 event in the southern Marches (central Italy)

2015 ◽  
Vol 57 (6) ◽  
Author(s):  
Andrea Tertulliani ◽  
Viviana Castelli ◽  
Antonio Rossi ◽  
Maurizio Vecchi
Keyword(s):  
Historical Data ◽  
Central Italy ◽  
Earthquake Damage ◽  
Special Care ◽  
Data Set ◽  
Local Earthquakes

<p>The earthquake of October 3, 1943, is an important event for characterization of hazard in central Italy, but none of the earlier studies provide an exhaustive description of its effects. The context in which the earthquake occurred was very complex and many relevant records were not available for consultation when the studies were made. This study set out to improve our understanding of the earthquake and its effects by giving special care to the interpretative problems deriving from the peculiar historical and seismological context of the 1943 earthquake, with reference to the possible interactions between earthquake damage and war damage, and between the effects of the 1943 earthquake and those of other local earthquakes occurred between 1936 and 1951. The historical data set collected by earlier studies was critically revised and more data were sought in repositories that had not been previously considered. The number of localities for which a macrosesmic intensity can be assessed increased from 131 to 170. All intensity values were reassessed; from these we calculate a new macroseismic magnitude Mw 5.5 of the October 3, 1943, earthquake.</p>

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 Automatic Parametrization of Urban Areas Using ALS Data: The Case Study of Santiago de Compostela

2018 ◽  
Vol 7 (11) ◽  
pp. 439 ◽  
Author(s):  
Mario Soilán ◽  
Belén Riveiro ◽  
Patricia Liñares ◽  
Andrea Pérez-Rivas
Keyword(s):  
Urban Areas ◽  
Building Blocks ◽  
Maximum Efficiency ◽  
Urban Structure ◽  
Santiago De Compostela ◽  
Cloud Data ◽  
Laser Scanners ◽  
Using Data

Nowadays, gathering accurate and meaningful information about the urban environment with the maximum efficiency in terms of cost and time has become more relevant for city administrations, as this information is essential if the sustainability or the resilience of the urban structure has to be improved. This work presents a methodology for the automatic parametrization and characterization of different urban typologies, for the specific case study of Santiago de Compostela (Spain), using data from Aerial Laser Scanners (ALS). This methodology consists of a number of sequential processes of point cloud data, using exclusively their geometric coordinates. Three of the main elements of the urban structure are assessed in this work: intersections, building blocks, and streets. Different geometric and contextual metrics are automatically extracted for each of the elements, defining the urban typology of the studied area. The accuracy of the measurements is validated against a manual reference, obtaining average errors of less than 3%, proving that the input data is valid for this assessment.

scholarly journals TERRISCOPE: AN OPTICAL REMOTE SENSING RESEARCH PLATFORM USING AIRCRAFT AND UAS FOR THE CHARACTERIZATION OF CONTINENTAL SURFACES

2018 ◽  
Vol XLII-1 ◽  
pp. 65-70
Author(s):  
Y. Boucher ◽  
A. Amiez ◽  
P. Barillot ◽  
C. Chatelard ◽  
C. Coudrain ◽  
...  
Keyword(s):  
Remote Sensing ◽  
High Performance ◽  
State Of The Art ◽  
Optical Measurements ◽  
Optical Remote Sensing ◽  
Airborne Laser ◽  
Laser Scanners ◽  
Research Platform ◽  
Infrared Cameras

<p><strong>Abstract.</strong> ONERA is developing TERRISCOPE, a new platform to characterize the environment and the continental surfaces by optical remote sensing using manned aircrafts and UAS (Unmanned Airborne System). The objective of TERRISCOPE is to make available to the scientific community combinations of optical measurements remotely sensed with the best level state-of-the-art sensors. Different kinds of sensors have already been acquired or are still being acquired: Hyperspectral sensors (0.5&amp;ndash;2.5<span class="thinspace"></span>&amp;mu;m range), visible high resolution cameras, multispectral infrared cameras and airborne laser scanners. Each sensor is declined in two versions: one high performance for manned aircrafts and one more compact for UAS. This paper describes the whole equipment, and presents the main characteristics and performances of the carriers, the sensors and the processing chain. Possible sensors combinations on airplanes and UAS are also presented, as well as preliminary results.</p>

Low-cost characterization of 3D laser scanners

2007 ◽  
Author(s):  
Michele Russo ◽  
Giorgia Morlando ◽  
Gabriele Guidi
Keyword(s):  
Low Cost ◽  
Laser Scanners
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