Use of Magnetostatic Waves for Rotation Rate Sensing

先前的研究已经展示了一种新的微波环形谐振器，该谐振器基于引导静磁表面波，利用不均匀的面内偏磁场引导静磁表面波沿着封闭的圆形路径运动。这项研究将调查扩展到检查转速传感器或转速表。在这种应用中，当支持波的铁氧体膜旋转时，换能器保持静止。旋转速率由介质运动引起的波的附加相移确定。原则上，这种转速计的响应时间可短至几百纳秒。能够进行几乎瞬时的转速测量将有助于许多用于工业过程和机器人的控制系统的稳定性和速度。本研究既有运动介质中静磁波的实验研究，也有理论研究。

Previous research has demonstrated a new microwave ring resonator based on guided magnetostatic surface waves, which are guided around a closed circular path using a nonuniform in-plane magnetic bias field. This research extends the investigation to examining a rotation rate sensor, or tachometer. In such an application, the transducers remain stationary while the ferrite film supporting the waves is rotated. The rotation rate is determined from the additional phase shift of the waves caused by the motion of the medium. Such a tachometer could, in principle, exhibit a response time as short as several hundred nanoseconds. The ability to make virtually instantaneous rotation rate measurements would contribute to the stability and speed of many control systems used with industrial processes and robotics. The research has both the experimental portion and theoretical studies of magnetostatic waves in moving media.