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| 磁流体薄片中聚焦激光束对交流磁场的相位独立响应 | |
| 引用本文： | 袁绥华,李洪杰,张广溢. 磁流体薄片中聚焦激光束对交流磁场的相位独立响应[J]. 功能材料与器件学报, 2002, 8(1): 18-22 |
| 作者姓名： | 袁绥华 李洪杰 张广溢 |
| 作者单位： | 1. 西南师范大学物理系,重庆,400715 2. 西安交通大学电气工程学院,西安,710049 3. 四川工业学院电机系,成都,610039 |
| 基金项目： | OpenLaboratoryofOpto-ElectronicsoftheEducationalMinistryofChina |
| 摘 要： | 报导了磁流体薄片中聚焦激光束在探测50Hz交流磁场时产生与磁场相位无关响应的效应。聚焦于并通过磁流体薄片的633nm激光束的偏转角仅与交流磁场的幅度相关。为了探寻其机理，还研究了磁流体中聚焦激光束对开／关磁场或激光的瞬态响应。提出了基于磁熵守恒的磁流体中磁性粒子密度再分布正反馈模型来解释这一效应。这一模型也可以预 磁流体中一种磁－热失稳现象。 |
| 关 键 词： | 磁流体薄片 聚焦激光束 交流磁场 相位独立响应 |
Phase-independent response of a focused laser beam on a ferrofluid slab to A. C. magnetic field |
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| YUAN Sui-hua,LI Hong-jie,ZHANG Guang-yi. Phase-independent response of a focused laser beam on a ferrofluid slab to A. C. magnetic field[J]. Journal of Functional Materials and Devices, 2002, 8(1): 18-22 | |
| Authors: | YUAN Sui-hua LI Hong-jie ZHANG Guang-yi |
| Affiliation: | YUAN Sui-hua1,LI Hong-jie2,ZHANG Guang-yi3 |
| Abstract: | The effect of phase-independent response of a laser beam focused on a ferrofluid slab in sensing the 50 Hz magnetic field was reported.The refraction angles of a laser beam of 633nm wave- length focused on a slab of ferrofluid only respond to the magnitude of the magnetic field. Transient responses of the ferrofluid to switching magnetic field or light on/off were also measured to search the mechanism of the effect. A model of magnetic entropy conservation-based positive feedback in density redistributions of the magnetic particles in the ferrofluid is proposed for explaining this effect. This model also predicts a magneto-thermal instability in the ferrofluid. |
| Keywords: | Phase-independent response focused laser beam ferrofluid |
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