磁弹性材料共振特性研究以及在液体粘度和重金属离子检测的应用

发布时间：2018-06-07 16:31

本文选题：磁弹性传感器 + 共振频率　；参考：《太原理工大学》2015年博士论文

【摘要】：磁弹性传感器具有高灵敏度、低成本和非接触测量等诸多优势而备受关注,因此在无损检测、生物活体检测、食品安全和环境监测等领域具有巨大的应用前景。本文主要通过实验对磁弹性材料的共振特性进行研究,将磁弹性传感器应用于液体粘度测量和重金属离子检测,并研制了便携式磁弹性传感器共振频率测量装置。论文的主要内容和结论如下：1)搭建了磁弹性材料共振频率测量平台,利用该平台研究了三种磁弹性材料(METGLAS 2826MB、1K107和107K)的共振特性、共振模态、以及直流偏置磁场、交变激励磁场、退火处理、材料长度和扫描点数等可变参数对磁弹性材料共振特性的影响。研究发现：三种磁弹性材料都具有多个共振频率。METGLAS 2826MB在30kHz-280kHz范围具有五个幅值较大的共振峰。低阶(n=1～4)共振峰的共振频率和半高宽度基本成线性分布,而高阶(n=5)则出现非线性变化。直流偏置磁场的方向和大小影响METGLAS 2826MB材料的共振模态。优化交流偏置磁场可提高共振曲线的平滑度,避免产生毛刺和分叉,从而提高共振频率的准确性。提高质量负载的均匀度则可避免磁弹性传感器的错误响应。2)研究了液体粘度对METGLAS 2826MB材料的共振特性的影响,并将nMETGLAS 2826MB材料用于人体血液粘度的测量。通过对比不同共振模态下METGLAS 2826MB材料的共振频率对液体粘度的响应,高频率的共振模态具有更高的灵敏度。3)提出了一种基于Metglas 2826MB材料的置换反应快速检测液体中重金属离子的方法。该方法利用低成本的磁弹性材料,无需任何表面功能化修饰,直接与待测重金属离子溶液接触。通过实验发现：METGLAS 2826MB材料可以与硝酸铅或者硫酸铜溶液发生反应。材料表面铁的含量随着时间不断减少,而铅则不断增加。被置换出来的铅或铜均匀地附着在磁弹性材料表面。METGLAS 2826MB材料的共振频率偏移量随着测试溶液浓度的增加而变大。对于浓度为5mg/ml～25mg/ml的硝酸铅溶液,6mmx3mm×30μm的METGLAS 2826MB材料在150分钟后的共振频率偏移量呈线性变化。4)研制了磁弹性传感器共振频率测量便携式装置。通过实验结果对比分选,验证了样机的可行性。
[Abstract]:Magnetoelastic sensors have attracted much attention due to their advantages of high sensitivity, low cost and non-contact measurement, so they have great application prospects in the fields of nondestructive testing, biological in vivo detection, food safety and environmental monitoring and so on. In this paper, the resonance characteristics of magnetoelastic materials are studied through experiments. The magnetoelastic sensors are applied to the measurement of liquid viscosity and the detection of heavy metal ions, and a portable device for measuring resonance frequency of magnetoelastic sensors is developed. The main contents and conclusions are as follows: (1) A platform for measuring the resonance frequency of magnetoelastic materials is built. The resonance characteristics, resonant modes, DC bias magnetic field and alternating excitation magnetic field of three kinds of magnetoelastic materials (METGLAS 2826MB-1, 1K107 and 107K) are studied. The effects of annealing, material length and scanning number on the resonance characteristics of magnetoelastic materials. It is found that all three kinds of magnetoelastic materials have multiple resonance frequencies. METGLAS 2826MB has five resonance peaks with larger amplitude in the 30kHz-280kHz range. The resonance frequency and the half-height width of the resonance peak of the lower order are almost linearly distributed, while the higher order is characterized by the nonlinear variation of the resonance frequency and the half-height width of the resonance peak. The direction and magnitude of DC bias magnetic field affect the resonance mode of METGLAS 2826MB material. Optimizing AC bias magnetic field can improve the smoothness of resonance curve, avoid burr and bifurcation, and improve the accuracy of resonance frequency. The effect of liquid viscosity on the resonance characteristics of METGLAS 2826MB material was studied by increasing the uniformity of mass load. The error response of magnetoelastic sensor was avoided. The nMETGLAS 2826MB material was used to measure the blood viscosity of human body. By comparing the response of resonance frequency of METGLAS 2826MB material to liquid viscosity in different resonant modes, The high frequency resonance mode has higher sensitivity. 3) A new method for rapid detection of heavy metal ions in liquid by displacement reaction based on Metglas 2826MB material is proposed. The method uses low cost magnetoelastic materials without any surface functionalization and is directly in contact with the solution of heavy metal ions to be measured. It is found that the reaction of 2826MB with lead nitrate or cupric sulfate solution can be carried out. The content of iron on the surface of the material decreases with time, while the content of lead increases. The displacement of lead or copper onto the surface of the magnetoelastic material. METGLAS 2826MB increases with the increase of the concentration of the measured solution. A portable magnetoelastic sensor resonant frequency measurement device has been developed for METGLAS 2826MB material with concentration of 5mg/ml~25mg/ml (6mm x 3mm 脳 30 渭 m) with a linear variation of resonance frequency deviation after 150 minutes. The feasibility of the prototype is verified by comparing and sorting the experimental results.
【学位授予单位】：太原理工大学
【学位级别】：博士
【学位授予年份】：2015
【分类号】：TP212

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