Bedekar V, Bichurin M I, Ivanov S N, Pukinski Y J, Priya S
Materials Science and Engineering, Center for Energy Harvesting Materials and Systems, Virginia Tech, Blacksburg, Virginia 24061, USA.
Rev Sci Instrum. 2010 Mar;81(3):033906. doi: 10.1063/1.3354985.
Gradiometer resembles in functionality a magnetic field sensor where it measures the magnetic field gradient and its sensitivity is determined by the ability to quantify differential voltage change with respect to a reference value. Magnetoelectric (ME) gradiometer designed in this study is based upon the nickel (Ni)-Pb(Zr,Ti)O(3) (PZT) composites and utilizes the ring-dot piezoelectric transformer structure working near the resonance as the basis. The samples had the ring-dot electrode pattern printed on the top surface of PZT, where ring acts as the input while dot acts as the output. There is an insulation gap between the input and output section of 1.2 mm. The generated magnetic field due to converse ME effect interacts with the external applied magnetic field producing flux gradient, which is detected through the frequency shift and output voltage change in gradiometer structure. The measurements of output voltage dependence on applied magnetic field clearly illustrate that the proposed design can provide high sensitivity and bandwidth.
梯度仪在功能上类似于磁场传感器，它测量磁场梯度，其灵敏度由相对于参考值量化差分电压变化的能力决定。本研究设计的磁电（ME）梯度仪基于镍（Ni）-铅锆钛酸铅（PZT）复合材料，并采用在共振附近工作的环形-点状压电变压器结构作为基础。样品在PZT顶面上印有环形-点状电极图案，其中环作为输入，点作为输出。输入和输出部分之间有1.2毫米的绝缘间隙。由于逆磁电效应产生的磁场与外部施加的磁场相互作用，产生通量梯度，通过梯度仪结构中的频率偏移和输出电压变化来检测。输出电压对施加磁场的依赖性测量清楚地表明，所提出的设计可以提供高灵敏度和带宽。
