Doppler radar device for e.g. tweeter or acoustic signal generator, has piezoelectric components operable both as conductive actuator for producing resonance oscillation and as non-conductive sensor for measuring impact sound oscillation

摘要

The device has a radiation window determining the speed and/or the path of a railway vehicle above the ground. The radiation window is mechanically contacted with piezoelectric components (6, 6`), which are electrically controlled by electrodes. The piezoelectric components are operable both as a current conductive actuator for producing resonance oscillation and as a current non-conductive sensor for measuring impact sound oscillation.