Filtern
Erscheinungsjahr
Dokumenttyp
- Beitrag zu einem Tagungsband (18)
- Zeitschriftenartikel (12)
- Beitrag zu einem Sammelband (6)
- Vortrag (5)
- Buchkapitel (3)
- Handbuch (1)
Sprache
- Englisch (45) (entfernen)
Schlagworte
- Monitoring (4)
- Messtechnik (3)
- Sensorik (3)
- Structural health monitoring (3)
- Application (2)
- Characterisation (2)
- Digital image correlation (DIC) (2)
- Digitale Bildkorrelation (DIC) (2)
- Drop test (2)
- Dynamic testing (2)
- Dynamische Tests (2)
- Polymer optical fiber (2)
- Spannungs-Dehnungs-Kurve (2)
- Split Hopkinson pressure bar (SHPB) (2)
- Standard (2)
- Strain (2)
- Stress-strain curve (2)
- Temperature (2)
- Accelerometer (1)
- Additive Manufacturing (1)
- Ageing (1)
- Aging (1)
- Air-based (1)
- Berlin Main Station (1)
- Bridges (1)
- Brillouin scattering (1)
- Brillouin-Streuung (1)
- Chemiluminescence (1)
- Chemiluminescence (CL) (1)
- Condition monitoring (1)
- Damage detection of bridges (1)
- Data processing (1)
- Data-fusion (1)
- Defect evaluation (1)
- Degradation (1)
- Dehnungssensor (1)
- Differential displacements (1)
- Digital image correlation (1)
- Distributed sensor (1)
- Environment (1)
- Experimental-analytical symbiosis (1)
- FBG sensors (1)
- Faseroptischer Sensor (1)
- Fatigue (1)
- Fiber bragg grating (1)
- Fiber optic sensor (1)
- Fiber-optic sensor (1)
- Fibre-optic sensor (1)
- Hazardous scenarios (1)
- High speed stereo photogrammetry (1)
- Hydraulic levelling system (1)
- In-situ Process Monitoring (1)
- Intelligentes Geotextil (1)
- Lagrange multiplier test (1)
- Lagrangian Multipliers (1)
- Laser-based displacement measuring system (1)
- Localization (1)
- Long-term monitoring (1)
- Magnetic field (1)
- Magnetostrictive metal coating (1)
- Materials evaluation (1)
- Measurement Methods for Composition and Structure (1)
- Measurement Methods for Material Performance, Modelling and Simulation Methods (1)
- Measurement Methods for Material Properties (1)
- Measurement reliability (1)
- Mesh routing (1)
- Multi-hop (1)
- Multi-sensor system (1)
- Non-destructive Materials (1)
- Non-destructive testing (1)
- Numerical simulation (1)
- Optical Fibres (1)
- Optical digitization (1)
- Optical transmission stability (1)
- Plastic optical fibres (1)
- Polymer optical fibers (POFs) (1)
- Polymeroptische Faser (1)
- Process development (1)
- Reliability (1)
- Safety (1)
- Safety management (1)
- Self-diagnostic fiber optical sensor (1)
- Sensing (1)
- Sensors (1)
- Smart geotextiles (1)
- Specification (1)
- Standardisation (1)
- Standardization (1)
- Standards (1)
- Steel sheet container (1)
- Strain measurements (1)
- Strain sensor (1)
- Structural health (1)
- Structural modelling (1)
- Structured light scanning (SLS) (1)
- Temperature behavior (1)
- Testing (1)
- Textile-reinforced composites (1)
- Thermo-oxidative stability (1)
- Transparency (1)
- Verteilter Sensor (1)
- WSN (1)
Organisationseinheit der BAM
- 8 Zerstörungsfreie Prüfung (2)
- 4 Material und Umwelt (1)
- 4.2 Material-Mikrobiom Wechselwirkungen (1)
- 5 Werkstofftechnik (1)
- 5.1 Mikrostruktur Design und Degradation (1)
- 5.2 Metallische Hochtemperaturwerkstoffe (1)
- 5.4 Multimateriale Fertigungsprozesse (1)
- 8.0 Abteilungsleitung und andere (1)
- 8.1 Sensorik, mess- und prüftechnische Verfahren (1)
- 8.3 Thermografische Verfahren (1)
Eingeladener Vortrag
- nein (5)
VDI/VDE-Guideline 5570 - The First Comprehensive Standard on Characterization and Testing of POF
(2002)
With more than 180.000 engineers and scientists VDI Association of German Engineers and VDE Association for Electrical, Electronic & Information Technologies are belonging to the major technical and scientific associations in Europe. Both organizations promote the advancement of technology and among other things by developing recognized technical regulations as national and international standards. Since 2011 Technical Committee 2.15 Optical Measuring Methods for Structure Analysis and Monitoring as a common committee of both organizations is working among other things on the development of standards for optical measuring and testing methods. The committee consists of 27 members representing industrial users, system manufacturers, research institutes and universities. Currently the committee is drafting the new standard VDI/VDE 2626 Part 1 - Optical measuring procedures – Image correlation methods – Basics and equipment, which will be introduced in this presentation.
Draft VDI/VDE 2626 Part 1 describes practical acceptance and reverification procedures for the evaluation of the accuracy of optical measuring systems based on digital image correlation (DIC) methods. The document applies to DIC measurement systems used a) for full-field determination of two- or three-dimensional displacement of surfaces, and b) for
full-field determination of the elongation or strain of surfaces. The standard describes quality parameters as well as methods and reference objects for their determination. The quality parameters serve to specify DIC systems, and to compare different systems. They are equally suitable a) for acceptance tests as well as b) for reverification of DIC systems within the framework of a quality management system.
The acceptance test is used to determine whether the DIC system complies with the quality parameter limits specified by the manufacturer, or with contractually agreed limits by the manufacturer and user, respectively. For this test the quality parameters zero-displacement error, zero-strain error, and displacement error are defined and used. Zero-displacement error and zero-strain error describe minimum measurement uncertainties of the DIC system a user has to reckon with. They are influenced by different uncertainty contributions. The quality parameter displacement error is used to check the ability of the DIC system to determine absolute displacements within the measurement volume and to confirm the traceability of this measurement to the SI system.
Reverification of DIC systems serves to ensure long-term compliance with specified limits for the quality parameters. By comparing the results of successive reverification measurements of the quality parameters used for the acceptance test, it is possible to analyze trends with respect to changes in DIC system characteristics.
The stress vs. strain curve of materials is affected the rate of imposed straining. Among the methods for dynamic testing the technique known as 'split Hopkinson pressure bar' (SHPB) has evolved into the most widely used one to exert high-speed straining. The theory behind it comprises simple equations to compute stress and strain. The reliability of the strain analysis can be assessed by digital image correlation (DIC). The present results indicate that the visually observed strain is smaller than predicted by theory.
The stress vs. strain curve of materials is affected the rate of imposed straining. Among the methods for dynamic testing the technique known as 'split Hopkinson pressure bar' (SHPB) has evolved into the most widely used one to exert high-speed straining. The theory behind it comprises simple equations to compute stress and strain. The reliability of the strain analysis can be assessed by digital image correlation (DIC). The present results indicate that the visually observed strain is smaller than predicted by theory.
Structural health monitoring by distributed fiber optic sensors embedded into technical textiles
(2012)
Technical textiles with embedded distributed fiber optic sensors have been developed for the purposes of structural health monitoring in geotechnical and civil engineering. The distributed fiber optic sensors are based on Brillouin scattering in silica optical fibers and OTDR in polymer optical fibers. Such 'smart' technical textiles are used for reinforcement of geotechnical and masonry structures. The embedded fiber optic sensors provide online information about the condition of the structure and about the occurrence and location of any damage or degradation.--------------------------------------------------------------------------------------------------------------------------------------------------------
Technische Textilien mit integrierten faseroptischen Sensoren eröffnen neue Möglichkeiten der Zustandsüberwachung (structural health monitoring) in Geotechnik und Ingenieurbau. Die verteilt messenden Sensoren basieren auf der Brillouin-Streuung in Glasfasern und auf der OTDR in polymeroptischen Fasern. Derartige 'intelligente' technische Textilien werden in erster Line zur Verstärkung von geotechnischen Bauwerken und von Gebäuden genutzt. Die integrierten Sensoren liefern eine zeitnahe Information über den bestimmungsgemäßen Zustand des Bauwerks sowie über die Entstehung und den Ort von lokalen Bauwerksschäden.
Standardization in fibre-optic sensing for structural safety - activities in the ISHMII and IEC
(2015)
Fiber-optic sensors are increasingly established in the sensor market. Their advantages have unquestionably been verified by numerous demonstrations to enhance the operational performance of aged structures or to monitor the structural behavior of safety-relevant structures or their components. However, there are some barriers in use due to a lack of extensive standardization of fiber-optic sensors. This leads very often to restraints in the users community. The paper shows the status in international standardization of fiber-optic sensors as well as current activities in leading institutions such as IEC and ISHMII and others with the purpose of providing relevant standards for a broader use of selected fiber-optic sensor technologies.