A5081497401- Smart Materials for Construction
- Ultrasonics and Acoustic Wave Propagation
- High voltage insulation and dielectric phenomena
- Geophysical Methods and Applications
- Dielectric materials and actuators
- Wood Treatment and Properties
- Advanced Sensor and Energy Harvesting Materials
- Thermography and Photoacoustic Techniques
- Non-Destructive Testing Techniques
Federal Institute For Materials Research and Testing
2018-2020
Abstract This paper reviews state-of-the-art in nondestructive testing (NDT) and semidestructive (SDT) methods applicable for imaging the condition of structural timber. Both NDT SDT reveal defects, damages, decay, while extent wood decay can also be quantified. Combined with an appropriate data interpretation concerning internal mechanical properties material assessed. The possibilities limitations most relevant individual methods, combination each other, are outlined compared. To...
High sensitivity is an important requirement for air-coupled ultrasonic sensors applied to materials testing. With a lower acoustic impedance than any piezoelectric material, charged cellular polypropylene (PP) offers better matching air with similar coefficient. The properties of PP originate from their polarization, creating permanent internal voltage. the sensor can be increased by applying additional dc bias voltage, as it has been done already transmitters. This work presents first...