AI 中文总结
该研究提出一种铋取代钇铁石榴石磁光指示膜与压电致动器耦合的应变介导磁光电压传感器，可实现交直流电压读出，等效电压噪声达毫伏每根赫兹范围，为光学隔离电压测量提供新途径。
AI 中文摘要
在高压及电磁恶劣环境中的应用需要可靠的电流隔离电压传感，这可通过光学读出实现。现有光学电压传感器依赖电光效应或压电应变结合直接光学检测，而应变介导的磁电耦合结合磁光读出提供了一种尚未充分探索的替代电压传感原理。本文介绍了一种基于铋取代钇铁石榴石磁光指示膜与压电致动器机械耦合的传感器。电压诱导的应力通过磁弹性耦合导致面外磁化变化，该变化通过磁光法拉第旋转检测。通过施加偏置场设置畴结构的临界状态，其中电压诱导的形核和畴壁运动主导响应。在该高灵敏度模式下，基于电压驱动的磁化反转或电压诱导的磁化回线形状改变，实现了交流和直流两种电压读出模式，达到了毫伏每根赫兹范围的等效电压噪声密度。该结果确立了应变介导的磁光电压传感作为一种独特的光学隔离电压测量方法。
英文摘要
Applications in high-voltage and electromagnetically harsh environments require reliable galvanically isolated voltage sensing, which can be achieved using optical readout. While established optical voltage sensors rely on electro-optic effects or piezoelectric strain with direct optical detection, strain-mediated magnetoelectric coupling combined with magneto-optical readout offers an alternative voltage sensing principle that remains largely unexplored. Here, such a sensor based on a bismuth-substituted yttrium iron garnet magneto-optical indicator film mechanically coupled to a piezoelectric actuator is presented. Voltage induced stress results in changes of the out-of-plane magnetization via magnetoelastic coupling which is detected through magneto-optical Faraday rotation. A critical state of the domain structure is set via an applied bias field, in which voltage-induced nucleation and domain-wall motion dominates the response. In this high sensitivity regime, both AC and DC voltage readout modes are demonstrated, based on either voltage-driven magnetization reversal or voltage-induced modifications of the magnetization loop shape. Equivalent voltage noise densities in the millivolt per root hertz range are achieved. The results establish strain-mediated magneto-optical voltage sensing as a distinct approach to optically isolated voltage measurement.
