抄録
This paper proposes a new type of absolute Displacement and Velocity Sensor based on the principle of servomechanism. The row natural frequency of the sensor is realized by using a positive feedback of relative displacement and velocity signal and a negative feedback of relative acceleration signals between the measured object and the inner mass of the sensor. It is shown that the sensor with small size and lightweight can have a low frequency measuring range. In addition the negative feedback of relative acceleration signal can expand the measuring displacement range.
