Miniaturisierung und Erhöhung des Frequenzbereiches von EMUS-Winkelprüfköpfen durch Einsatz von Hochfrequenz-Übertragern
Miniaturization and increase of the frequency range of EMUS-angle probes using RF-cores
EMUS-Angle Probes Consisting of Permanentmagnets with spatially alternating polarity have been successfully used as T/R probes (seperate transmitter T and receiver R) for Shear Horizontal waves in the frequency range >1 Mhz. To increase the frequency range and to reduce the geometrical size of the probes, the RF air coils of the probe were replaced by RF coils wounded on high permeable RF cores. By the approach as well the stronger efficiency losses due to lift-off effects at frequencies > 1 Mhz as due to weaker magnetization strength could be compensated. Moreover it was possible to reduce the geometrical size of the probes because of the possibility to use the same RF core as transmitter and receiver.