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首页> 外文期刊>Review of Scientific Instruments >Magnetostrictive Vibration of Prolate Spheroids. Preliminary Measurements
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Magnetostrictive Vibration of Prolate Spheroids. Preliminary Measurements

机译：扁球体的磁致伸缩振动。初步测量

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摘要

Small but accurately shaped prolate spheroids of ferromagnetic substances, almost uniformly magnetized by direct current in a large coaxial solenoid, are subjected to alternating axial applied magnetic fields produced by high frequency current in a smaller coaxial solenoid. Measurements of the impedance of this high frequency coil with a specially designed Maxwell bridge, give, as the driving frequency is varied through the frequency of mechanical resonance in the fundamental mode of longitudinal vibration of the center‐supported spheroid, precise data for analyzing the distribution of electromagnetic driving forces and of magnetic, electrical, and mechanical losses by a theory to be given elsewhere. Since the spheroid dimensions are about 10 millimeters for length and one millimeter for diameter, the resonant frequencies of interest are near 300 kilocycles per second. Optical measurements of vibration amplitude, possible in principle, have not yet been effectuated.
机译：在大型同轴螺线管中被直流电几乎均匀磁化的铁磁性物质的小但形状精确的扁长球体，在较小的同轴螺线管中经受高频电流产生的交变轴向施加磁场。使用特别设计的麦克斯韦电桥测量此高频线圈的阻抗，可以得出驱动频率随中心支撑球体纵向振动基本模式中的机械共振频率而变化的结果，从而可以得到用于分析分布的精确数据电磁驱动力以及磁，电和机械损耗的理论将在其他地方给出。由于椭球体的长度长度约为10毫米，直径约为1毫米，因此感兴趣的共振频率接近300千转/秒。原则上尚未实现对振动幅度的光学测量。

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