| 超声波在磁性液体中的传播特性 |
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| 引用本文： | 都有为,童兴武,钟伟,王挺祥,干昌明,章肖融.超声波在磁性液体中的传播特性[J].物理学报,1992,41(1):144-148. |
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| 作者姓名： | 都有为 童兴武 钟伟 王挺祥 干昌明 章肖融 |
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| 作者单位： | (1)南京大学固体微结构物理国家实验室,南京,210008; (2)南京大学声学研究所,南京,210008 |
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| 基金项目： | 中国科学院磁学开放研究实验室的部分资助 |
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| 摘 要： | 本文报道超声波在磁性液体中的传播特性,首先研究了磁化状态建立与消失的弛豫过程,弛豫时间约20min,为了保证平衡状态下进行测量,所有数据均为附加磁场60min后进行的测量,然后在f=4HMz下,测量了φ=0,π/2的声速与磁场的关系,声速与磁性液体中磁性颗粒浓度的关系,对有关理论进行了解释。
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| 关 键 词： | 超声波 传播 磁性液体 磁场 驰豫 |
| 收稿时间： | 1991-01-28 |
PROPAGATING CHARACTERISTICS OF ULTRASONIC WAVE IN THE MAGNETIC LIQID |
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| DU YOU-WEI,TONG XING-WU,ZHONG WEI,WANG TING-XIANG,GAN CHANG-MING and ZHANG XIAO-RONG.PROPAGATING CHARACTERISTICS OF ULTRASONIC WAVE IN THE MAGNETIC LIQID[J].Acta Physica Sinica,1992,41(1):144-148. |
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| Authors: | DU YOU-WEI TONG XING-WU ZHONG WEI WANG TING-XIANG GAN CHANG-MING and ZHANG XIAO-RONG |
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| Abstract: | Here we report experimental results of propagating characteristics of ultrasonic wave and explain it in light of existing theories. First, we study the relaxation process after magnetic field built up. It is known that the particles form chain-like clusters when the magnetic field is applied. The process of the cluster for mation is a relaxation process. The ultrasonic velocity v as a function of magnetic field at field angle θ= 0 and π/2 at 4MHz were measured. We have studied the dependence of velocity on. Concentrations of the magnetic particles and frequency. The experimental results can be explain by Tarapov's theory rather than th approach used by Parsons. |
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