Piezoelectric angular acceleration sensor

This paper deals with a piezoelectric angular acceleration sensor, which might be proposed by us, first, as a new concept of the sensor to detect a rotational motion only. In the first part of this paper are dealt with some concrete constructions of this new concept of angular acceleration sensor, composed of piezoelectric transducers. The second part contains their basic experimental investigation. As a result, it has been proved that the sensor proposed surely operates as an angular acceleration sensor with a function which can distinguish a signal rotational motion from other ones of linear motion.