When implementing temporary vibration monitoring of mechanical equipment, it is hoped that the installation and disassembly of the sensor will not change the original structure of the equipment. In that case, non-intrusive vibration sensors are preferable. This paper presents a motion induced eddy current sensor that can non-intrusively acquire vibration signal from the surface of metal objects. The sensor consists of a cylindrical permanent magnet and a pancake coil coaxially placed under it. The permanent magnet is used to generate a static magnetic field and the coil is used to pick up the eddy current signal induced by vibration. The results of principle experiments indicate that the output signal of the sensor has a linear relationship with the vibration acceleration/velocity when the measured object is a non-ferromagnetic/ferromagnetic metallic specimen. Two application measurement experiments are also done. When the sensor is placed on the metallic panel of a weighting scale, the ballistocardiogram (BCG) of the human body can be effectively obtained. Another experiment is carried out on a rotor test bed. When the sensor is placed above the bearing support with a fixed lift distance, satisfying vibration signals can be obtained compared with that from the conventional piezoelectric accelerometer. The present works show that the simple-structure, low-cost, non-intrusive vibration sensor (MIECS) can be applied in various fields.

中文翻译：

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用于非侵入式振动测量的运动感应涡流传感器

在对机械设备实施临时振动监测时，希望传感器的安装和拆卸不改变设备的原有结构。在这种情况下，非侵入式振动传感器是首选。本文提出了一种运动感应涡流传感器，它可以非侵入式地从金属物体表面获取振动信号。该传感器由一个圆柱形永磁体和一个同轴放置在其下方的扁平线圈组成。永磁体用于产生静磁场，线圈用于拾取振动感应的涡流信号。原理实验结果表明，当被测物体为非铁磁性/铁磁性金属试样时，传感器的输出信号与振动加速度/速度呈线性关系。还进行了两个应用测量实验。当传感器放置在称重秤的金属面板上时，可以有效地获得人体的心冲击图（BCG）。另一个实验是在转子试验台上进行的。当传感器放置在轴承支架上方并保持一定的提升距离时，与传统压电加速度计相比，可以获得令人满意的振动信号。目前的工作表明，结构简单、成本低、非侵入式振动传感器（MIECS）可以应用于各个领域。还进行了两个应用测量实验。当传感器放置在称重秤的金属面板上时，可以有效地获得人体的心冲击图（BCG）。另一个实验是在转子试验台上进行的。当传感器放置在轴承支架上方并保持一定的提升距离时，与传统压电加速度计相比，可以获得令人满意的振动信号。目前的工作表明，结构简单、成本低、非侵入式振动传感器（MIECS）可以应用于各个领域。还进行了两个应用测量实验。当传感器放置在称重秤的金属面板上时，可以有效地获得人体的心冲击图（BCG）。另一个实验是在转子试验台上进行的。当传感器放置在轴承支架上方并保持一定的提升距离时，与传统压电加速度计相比，可以获得令人满意的振动信号。目前的工作表明，结构简单、成本低、非侵入式振动传感器（MIECS）可以应用于各个领域。当传感器放置在轴承支架上方并保持一定的提升距离时，与传统压电加速度计相比，可以获得令人满意的振动信号。目前的工作表明，结构简单、成本低、非侵入式振动传感器（MIECS）可以应用于各个领域。当传感器放置在轴承支架上方并保持一定的提升距离时，与传统压电加速度计相比，可以获得令人满意的振动信号。目前的工作表明，结构简单、成本低、非侵入式振动传感器（MIECS）可以应用于各个领域。