Compensation Network for Temperature Dependency and Bandwidth Expanding of Magnetoelectric Velocity Sensor Based on Phase Prediction Compensator

In order to compensate the temperature dependence of magnetoelectric velocity sensor (MVS) and subsequently extend its measuring bandwidth, the phase prediction compensator (PPC) is proposed in this article, which can compensate both amplitude and phase error in real time. The proposed PPC successfully introduces sequence predictor and phase corrector to predict output signal phase of MVS and compensate phase delay. The amplitude corrector is also contained to compensate the amplitude error, which is in series with the module of the phase compensation. This novel PPC works at state of the optimum parameter all the time to compensate the dynamic performance of MVS. Compared with the traditional compensation network which can only expand the frequency band and is easily affected by temperature variation, the PPC can solve these two problems at the same time in low cost. The experiment results show that with the temperature variation, velocity measurement deviation can be greatly reduced from ±20% to ±5% by the PPC, and the natural frequency of the MVS system can be reduced from the original 4.59Hz to 0.3Hz, which expands the frequency band of the MVS.