Frequency Response Improvement for Inertial Magnetoelectric Velocity Sensor Using Frequency-Selected Compensation Network

The inertial magnetoelectric velocity sensor is widely used in the fields of vibration control and measurement. The frequency response in the low frequency range is, however, limited by high frequency resonance because of the characteristic of second order high pass filter of the structure. A frequency-selected network for amplitude-frequency characteristic compensation to improve the performance of the frequency response is presented. The frequency-selected network, which is composed of amplifiers, resistors, and capacitances, is connected to the output port of the sensor in cascade without any modification of the sensor's structure. After compensation, the frequency band of the sensor is flattened and frequency response still has the characteristic of second order high pass filter, whereas the resonant frequency decreases from ~ 10 to 0.93 Hz. Meanwhile, it keeps the transducer in small size and light weight. The experimental results have shown that the sensor after been compensated has good performance in the low frequency range.