Measurement of Ultrasonic Attenuation in Magnetic Fluid and its Application to Surface Profiling
Measurement of Ultrasonic Attenuation in Magnetic Fluid and its Application to Surface Profiling
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磁流体中超声波衰减的测量及其在表面轮廓分析中的应用
DOI：
10.1143/jjap.36.3188
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发表时间：
1997
影响因子：
1.5
通讯作者：
H. Inoue
中科院分区：
文献类型：
--
作者：
K. Imano;H. Inoue
为了研究超声在磁流体中传播时的频率和磁场特性，对磁流体中的超声衰减进行了测量。解释了用于超声波衰减测量的参考方法，并且该参考方法通过在1至15 MHz的频率范围内的脉冲反射系统来执行。本文用脉冲传输系统测量了磁场强度为0 ~ 0.2T时，磁场衰减与磁场的关系。实验结果表明：（1）在3.5MHz频率范围内，衰减常数除以频率的平方α/f2几乎为常数（0.5 × 10 - 15 s2/cm）。2)磁场中衰减的相对变化Δα在1至15 MHz的频率范围内小于2 dB。在铝板中的钻孔的表面形貌轮廓进行演示的超声波传播介质的MF的有用性。
The measurement of ultrasonic attenuation in a magnetic fluid (MF) is carried out to investigate the properties of frequency and magnetic field dependence in an ultrasonic propagation medium. The reference method for the ultrasonic attenuation measurement is explained and is executed by a pulse reflection system in the frequency range from 1 to 15 MHz. The magnetic field dependence of attenuation in a MF is measured with a pulse transmission system at a field strength from 0 to 0.2T. Experimental results show that: 1) the attenuation constant divided by the frequency squared, α/f 2 , is almost constant (0.5 X 10 -l5 s 2 /cm) over a frequency of 3.5MHz. 2) Relative changes in attenuation, Δα, in the magnetic field are less than 2 dB over the frequency range from 1 to 15 MHz. Surface topographical profiling of drilled holes in an aluminum plate is carried out to demonstrate the usefulness of a MF as an ultrasonic propagation medium.