交流电流对非晶带材AGMI传感时域特性影响分析  

Analysis of influence of AC current intensity on time-domain sensing properties of amorphous ribbon AGMI sensor

作　　者：柴秀丽[1,2] 甘志华[3] 赵建军[1,2] 

机构地区：[1]河南大学先进控制与智能信息处理研究所,河南开封475001 [2]河南大学计算机与信息工程学院,河南开封475001 [3]河南大学计算中心,河南开封475001

出　　处：《传感器与微系统》2010年第3期16-18,22,共4页Transducer and Microsystem Technologies

基　　金：广东省科技计划资助项目(2007B010600043);河南省科技攻关计划资助项目(072102260022)

摘　　要：非对称巨磁阻抗(AGMI)效应可用于高灵敏传感器的研制。提出非晶带材AGMI效应的3种工作模式同时作用下的物理模型,以法拉第电磁感应定律和自由能最小化原则为基础,建立低频工作频率下的传感模型,推导AGMI效应传感用输出电压的数学表达式,数值计算分析了交流电流强度变化时,输出电压的时域特性。研究结果表明:交流电流ia2较小时,输出电压呈现一次谐波特征,电流强度较大时,二次谐波占主导地位,强度幅值随ia2的增加而增加。研究结果对于高性能传感器的研制将具有重要的指导作用。Asymmetric giant magnetoimpedance（AGMI） effect can be used to develop high sensitive sensors. The physical model of amorphous ribbon AGMI effect considering three working patterns is presented. Based on Farady＇ s law and the principle of free energy minimization, sensing model at low frequency is established, and the expression of AGMI sensor output voltage is derived. And the time-domain characteristics of the output voltage on AC current intensity change is numerically calculated and analyzed. The results show that when the AC current intensity is small, the output voltage has first harmonic characteristics, when the intensity is large, the frequency of the voltage mainly has second harmonic characteristics dominates, and intensity amplitude increases with ia2 increasing. The results will play an important guiding role for the development of high performance sensors.

关 键 词：AGMI效应 传感模型 时域特性 传感器 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]