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View article: Development of distributed sensor electronics for energy-efficient and proactive maintenance of buildings
Development of distributed sensor electronics for energy-efficient and proactive maintenance of buildings Open
Permanently installed sensor systems are becoming increasingly important for monitoring critical infrastructure. The research institutes Fraunhofer IZFP and BAM, together with industrial partners and users, are developing a concept for an …
View article: Imaging of vertical surface-breaking cracks in concrete members using ultrasonic shear wave tomography
Imaging of vertical surface-breaking cracks in concrete members using ultrasonic shear wave tomography Open
Surface-breaking cracks in concrete pose a significant threat to the durability of built structures. They create pathways for an accelerated moisture intrusion, and the transport of environmental and chemical agents such as chloride ions, …
View article: High-Frequency Ultrasonic Spectroscopy of Structure Gradients in Injection-Molded PEEK Using a Focusing Transducer
High-Frequency Ultrasonic Spectroscopy of Structure Gradients in Injection-Molded PEEK Using a Focusing Transducer Open
For high-performance thermoplastic materials, material behavior results from the degree of crystallization and the distribution of crystalline phases. Due to the less stiff amorphous and the stiffer and anisotropic crystalline phases, the …
View article: Using the Corner Reflection for Depth Evaluation of Surface Breaking Cracks in Concrete by Ultrasound
Using the Corner Reflection for Depth Evaluation of Surface Breaking Cracks in Concrete by Ultrasound Open
The corner echo is a well-known effect in ultrasonic testing, which allows detection of surface breaking cracks with predominantly perpendicular orientation to the surface as, for example, corrosion cracks in metal pipes or shafts. This ec…
View article: A2.2 - Non-destructive inline sensors for digital material twin in the carbon fiber tape laying process
A2.2 - Non-destructive inline sensors for digital material twin in the carbon fiber tape laying process Open
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View article: Numerical investigation of near and far field ultrasound transducer radiation characteristics in concrete
Numerical investigation of near and far field ultrasound transducer radiation characteristics in concrete Open
Concrete is the most frequently used material in civil engineering. Therefore, it also plays an im-portant role for nondestructive testing methods like ultrasonic testing. In the past Dry Point Contact transducers have proven to be very ef…
View article: Evaluation of retroreflective corner echo for detection of surface breaking cracks in concrete by ultrasound
Evaluation of retroreflective corner echo for detection of surface breaking cracks in concrete by ultrasound Open
The retroreflective corner echo is used, for example, in ultrasonic non-destructive testing of metals to find fatigue cracks in tubes or shafts. If the much weaker crack tip signal is additionally detected, the crack length can also be det…
View article: Efficient Detection of Defective Parts with Acoustic Resonance Testing Using Synthetic Training Data
Efficient Detection of Defective Parts with Acoustic Resonance Testing Using Synthetic Training Data Open
Analyzing eigenfrequencies by acoustic resonance testing enables a fast screening of components regarding structural defects. The eigenfrequencies of each specific part depend on the general geometric and material properties, including tol…
View article: Characterization of Ancient Marquetry Using Different Non-Destructive Testing Techniques
Characterization of Ancient Marquetry Using Different Non-Destructive Testing Techniques Open
Non-destructive testing of objects and structures is a valuable tool, especially in cultural heritage where the preservation of the inspected sample is of vital importance. In this paper, a decorative marquetry sample is inspected with thr…
View article: Simulation-Based Generation of Representative and Valid Training Data for Acoustic Resonance Testing
Simulation-Based Generation of Representative and Valid Training Data for Acoustic Resonance Testing Open
Analyzing eigenfrequencies of serial parts by acoustic resonance testing enables an efficient nondestructive assessment of component quality or structural state. Usually, each application is based on experimentally acquired training data, …
View article: Air Ultrasonic Signal Localization with a Beamforming Microphone Array
Air Ultrasonic Signal Localization with a Beamforming Microphone Array Open
Nondestructive testing methods are used to inspect and test materials and components for discontinuities or differences in mechanical characteristics. Phased array signal processing techniques have been widely used in different application…
View article: Use of Thermography and Ultrasound for the Quality Control of SMC Lightweight Material Reinforced by Carbon Fiber Tapes
Use of Thermography and Ultrasound for the Quality Control of SMC Lightweight Material Reinforced by Carbon Fiber Tapes Open
Growing requirements of Sheet Molding Compound (SMC) parts make new material combinations necessary. One strategy is to reinforce SMC with unidirectional carbon fiber tapes to improve its mechanical properties. As quality assessment of cur…