Strong absorption of sound is often caused by the conversion of sound energy into heat. When this happens, it is not possible to study the interaction of sound with the absorbing material by means of reflected sound characteristics, because there is no reflected sound. Detecting for example the distance that sound travels in a strongly absorbing material, can be done by heat detection systems. ...

The aim of this work is to present radar cross section (RCS) measurements of a panel constituted of a flat aluminum plate with and without radar absorbing materials (RAM) type thin rubber sheets, in the range of 8 – 12 GHz. Two different loads were evaluated in the RAM formulation: 1. Magnetic (ferrites MnZn, NiZn and MgZn based), and 2. Dielectric (conducting polymers polyaniline based). The m...

Conventional strategies to measure mechanical vibrations from remote distance are based on Laser-Doppler-vibrometry (LDV). This technique is only rarely used in practical structural health monitoring (SHM) applications, due to the high costs of these devices. Radar technology represents a promising new approach towards in-situ SHM-scenarios with permanently installed sensors, because of the low...