A self-powered magnetostrictive sensor (SMS) for long-term earthquake monitoring is proposed in this article. A piece of magnetostrictive material was bonded on the upside surface of a stainless steel plate to form the proposed sensor. A force was applied on the free end of the sensor to mimic an earthquake vibration. The applied stress led to a varied permeability of the magnetostrictive material according to the Villari effect. Then, the varied permeability produced a varied magnetic field. The varied magnetic field was captured by a coil to generate electric power for an earthquake alarm. A theoretical analysis was investigated in this article. After the fabrication of a sensor prototype, the vibration characteristics and voltage output ability were measured. The maximum vibration amplitude and maximum output trust voltage were tested to be 25 mm and 0.38 V (peak to peak) under an applied force of 2 N. The proposed SMS exhibits merits of simple structure, small size, easy fabrication, and long-term working ability.

中文翻译：

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用于长期地震监测的自供电磁致伸缩传感器

本文提出了一种用于长期地震监测的自供电磁致伸缩传感器（SMS）。一块磁致伸缩材料粘合在不锈钢板的上表面以形成建议的传感器。在传感器的自由端施加一个力来模拟地震振动。根据维拉里效应，施加的应力导致磁致伸缩材料的磁导率发生变化。然后，变化的磁导率产生变化的磁场。线圈捕获变化的磁场以产生用于地震警报的电力。本文进行了理论分析。传感器样机制作完成后，对其振动特性和电压输出能力进行了测量。