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Schlagworte
- Active thermography (17)
- Thermography (7)
- CFRP (6)
- Concrete (5)
- Radar (5)
- Non-destructive testing (4)
- Non-destructive testing in civil engineering (4)
- Additive manufacturing (3)
- Cracks (3)
- Flash excitation (3)
- GFRP (3)
- Impulse-thermography (3)
- Masonry (3)
- Plaster (3)
- Voids (3)
- Additive Manufacturing (2)
- Blind / characteristic frequency (2)
- Classification (2)
- Delaminations (2)
- Flash (2)
- Flash lamp (2)
- Impact-echo (2)
- Laser Scanning (2)
- Laser metal deposition (2)
- Lockin (2)
- Metal (2)
- Multi-Spectral (2)
- NDT-CE (2)
- Numerical simulation (2)
- Process monitoring (2)
- Pulse phase thermography (2)
- Pulse-phase-thermography (2)
- Rekonstruktion (2)
- Round robin test (2)
- Standardisation (2)
- Ultrasonic echo (2)
- 3D Druck (1)
- 3D laser scanning (1)
- 3D printing (1)
- Acoustic emission (1)
- Acquisition (1)
- Additive Fertigung (1)
- Additive manufacturing (AM) (1)
- Antenna (1)
- Artificial and natural defects (1)
- Artificial weathering (1)
- Asphalt (1)
- Bond behaviour (1)
- CFRP reference (1)
- CFRP-laminates (1)
- CFRP-strengthening (1)
- Calorimetric sensor (1)
- Combination of NDT-methods (1)
- Concrete bridge (1)
- Concrete cover of tendon ducts (1)
- Concrete slabs (1)
- Crack detection (1)
- Cultural Heritage (1)
- Damage Assessment (1)
- Datenglättung (1)
- Debonding (1)
- Defect shape reconstruction (1)
- Defekte (1)
- Delamination (1)
- Detection (1)
- Direct energy deposition (1)
- Echo defect shape (1)
- Effectiveness of repair (1)
- Emissivity (1)
- Energy distribution (1)
- Energy meter (1)
- FEM modelling (1)
- FFT (1)
- Fiber resisted polymers (1)
- Flat bottom holes (1)
- Flying spot (1)
- Ground penetration radar (1)
- Heat pulse (1)
- Heat transfer modeling (1)
- Historic facades (1)
- Historic masonry (1)
- Historic plaster (1)
- Historic structures (1)
- Honeycombing (1)
- Impact (1)
- Impact damage (1)
- Impulse radar (1)
- Impulse thermography (1)
- In-situ monitoring (1)
- Infrared thermography (1)
- Inverse Probleme (1)
- Inversion (1)
- L-PBF (1)
- LMD (1)
- Large scale testing (1)
- Laser (1)
- Laser Metal Deposition (1)
- Laser Pulver Auftragsschweißen (1)
- Laser beam melting (LBM) (1)
- Laser excitation (1)
- Laser-thermography (1)
- Levenberg-Marquardt method (1)
- Lock-in Thermography (1)
- Modeling of wave propagation (1)
- Moisture Detection (1)
- Multi-Spectral Classification (1)
- Multispectral (1)
- Multispectral classification (1)
- Multispectral laser scanning (1)
- Multispectral thermography (1)
- NDT (1)
- Nondestructive testing in civil engineering (1)
- Optical methods (1)
- Passive thermography (1)
- Phase evaluation (1)
- ProMoAM (1)
- Pulse-phase thermography (1)
- Quantitative NDT (1)
- Quantitative non-destructive investigation (1)
- Railroad (1)
- Reconstruction calculation (1)
- Recording (1)
- Reference test specimen (1)
- Remote Sensing (1)
- SWIR camera (1)
- Selective laser melting (SLM) (1)
- Solar heating (1)
- Standardization (1)
- Steel (1)
- Stereo photogrammetry (1)
- Stone (1)
- Structural modelling (1)
- Surface crack (1)
- Surface properties (1)
- TES (1)
- Temperature emissivity separation (1)
- Tendon duct (1)
- Terrestrial (1)
- Thermal wave (1)
- Thermo-scanner (1)
- Thermografie (1)
- Thermographic testing (1)
- Thickness measurement (1)
- Three Dimensional (1)
- Tiles (1)
- Time over threshold (1)
- Time-resolved thermogram (1)
- Tracking sensor (1)
- Ultrasonic (1)
- Ultrasonic testing (1)
- Ultrasonics (1)
- Utility finding (1)
- Validation (1)
- Validation of methods (1)
- Vegetation Index (1)
- Wood (1)
- aluminum (1)
- computed tomography (1)
- flash thermography (1)
- pores (1)
Organisationseinheit der BAM
- 8 Zerstörungsfreie Prüfung (9)
- 8.0 Abteilungsleitung und andere (9)
- 9 Komponentensicherheit (4)
- 9.3 Schweißtechnische Fertigungsverfahren (3)
- 7 Bauwerkssicherheit (1)
- 7.5 Technische Eigenschaften von Polymerwerkstoffen (1)
- 8.4 Akustische und elektromagnetische Verfahren (1)
- 8.5 Röntgenbildgebung (1)
- 9.6 Additive Fertigung metallischer Komponenten (1)
Within the scope of a DIN INS project, a flash thermography round robin test that evaluates reliability, comparability, and efficiency of different testing situations was organized. The results give information about the detectability of defects, e.g. depending on their size and depth, the evaluation methods and the materials used. Besides, the influences of equipment and parameters used by the participants on the results were analysed. All of the quantitative results as well as the feedback given by the participants will be presented in a DIN committee in order to contribute to a flash thermography standard.
A round robin test on flash thermography was organized within the scope of a standardization research project. This test gives information on reliability, comparability and efficiency of different testing situations. Data recorded on metal and CFRP test specimens with flat bottom holes (FBH) were analysed by evaluating the detectability and by calculating the signal-to-noise ratio (SNR) of the defect signatures as a function of defect parameters. For the investigation of the influence of material properties on the spatial resolution as well as on penetration depth, test specimens made of steel and copper with crossed notches and a notch ramp were constructed and investigated. Here, the minimum resolvable notch distance and the maximum detectable depth of the ramp were analysed.
Additively manufactured test specimens made of polyamide 12 (PA 12) by Laser Sintering (LS) as well as of acrylnitril-butadien-styrol (ABS) by Fused Layer Modeling (FLM), were tested with active thermography. For this, two different excitation methods (flash and impulse excitation) were used and compared, regarding the suitability for the detection of constructed and imprinted defects. To increase the quality of the thermograms, data processing methods like thermal signal reconstruction (TSR) and Fourier-Transformation were applied. Furthermore, the long-term stability of the probes towards environmental stress, like UV-radiation, heat, water contact and frost is being investigated in the presented project with artificial weathering tests.
Amongst various other NDT methods, within the EMRP-project
‘VITCEA’ active thermography is validated for testing of CFRP and
GFRP structures constructed for energy application. In this
contribution, the optical and thermal properties of CFRP and GFRP
reference defect artefact (RDA) and natural defects artefact (NDA)
test specimens are characterized. Different excitation techniques
and techniques for data analysis are compared for optimizing the
number of detected defects.
The increased use of fibre-reinforced plastic (FRP) composites for improved efficiency and reliability in energy related applications e.g. wind and marine turbine blades, nacelles, oil and gas flexible risers, also increases the demand for innovative non-destructive testing technologies. Thus, in order to achieve increased acceptance of suited and optimized non-destructive testing (NDT) methods in industry, the European Metrology Research Programme (EMRP) project ENG57 Validated Inspection Techniques for Composites in Energy Applications (VITCEA) deals with the development and validation of innovative NDT technologies. In this contribution, results concerning thermographic investigations at test specimens during tensile loading and active thermography testing after tensile loading are presented. Additionally, the determination of the optical properties (relative transmittance and directional spectral emissivity) of CFRP and GFRP test specimens is described.
Active thermography is well suited for the detection of delaminations and cracks in façade elements like plaster and tiles. Not only artificial heating but also solar heating can be used if the adjustment of the façade and the weather conditions are suitable. Optical methods like laser scanners, photogrammetric methods and crack tracking sensors are providing geometrical 3D data which can be used for a 3D mapping of thermograms and for providing data with higher geometrical resolution. Thus, by the combination and fusion of these data, a comprehensive mapping and monitoring of damages of façade systems is possible.
Larger high pressure die castings (HPDC) and decreasing wall thicknesses are raising the issue of casting defects like pores in aluminum structures. Properties of components are often strongly influenced by inner porosity. As these products are being established more and more in lightweight construction (e.g. automotive and other transport areas), non-destructive testing methods, which can be applied fast and on-site, are required for quality assurance. In this contribution, the application of active thermography for the direct detection of larger pores is demonstrated. The analysis of limits and accuracy of the method are completed by numerical simulation and the method is validated using computed
tomography.
Additive manufacturing (AM) offers a range of novel applications. However, the manufacturing process is complex and the production of defect-free parts with high reliability and durability is still a challenge. Thermography is a valuable tool for process surveillance, especially in metal AM processes. The high process temperatures allow one to use cameras usually operating in the visible spectral range. Here, we compare the results of measurements during the manufacturing process of a commercial laser metal deposition setup using a mid-wavelength-IR camera with those from a visual spectrum high-speed camera with band pass filter in the near-IR range.