磁性流体的非线性声参量B/A的研究  

Study of acoustic nonlinearity parameter B/A for magnetic fluids

作　　者：刘杰惠[1,2] 龚秀芬[1,2] 鲁志劬 

机构地区：[1]南京大学近代声学国家重点实验室,南京210093 [2]南京大学声学研究所,南京210093

出　　处：《声学学报》1998年第2期107-112,共6页Acta Acustica

摘　　要：报导了水基和酯基磁性流体的非线性声参量B／A值随浓度和温度的变化关系。实验研究表明，磁性流体的B／A值随磁性颗粒浓度的增大而线性增大；磁性流体的B／A值随温度的升高而线性增大。还对超声波在磁性流体中传播的声速进行了精确测量。The acoustic nonlinearity parameter B/A values of water-based and diphthalate-based magnetic fluids are measured with the change of concentration and temperature. The results show that the B/A values of magnetic fluids increase linearly with increasing concentration of magnetic particles and increase linearly as temperature increases. The velocities of ultrasonic wave in magnetic fluids are also accurately measured.

关 键 词：超声波 浓度 温度 声速 磁性流体 非线性 声参量 

分 类 号：O422.7[理学—声学] O426.2[理学—物理]