A Wireless Embedded Sensor based on Magnetic Higher-order Harmonic Fields: Application to Liquid Pressure Monitoring.
A Wireless Embedded Sensor based on Magnetic Higher-order Harmonic Fields: Application to Liquid Pressure Monitoring.
复制标题
基于磁高阶谐波场的无线嵌入式传感器：在液体压力监测中的应用。
DOI：
10.1109/jsen.2010.2041223
复制
发表时间：
2010
影响因子：
4.3
通讯作者：
Ong,KeatGhee
中科院分区：
文献类型：
--
作者：
Tan,EeLim;Pereles,BrandonD;Ong,KeatGhee
基于磁弹性软磁合金材料，设计了一种用于流动流体压力遥测的无线传感器。该压力传感器是一个铁磁合金Fe 40 Ni 38 Mo 4 B18的矩形条，粘附在固体聚碳酸酯基底上，并由薄聚碳酸酯膜保护。在通过激励线圈激励时变磁场时，磁性软传感器磁化并产生更高次谐波场，其通过检测线圈检测。在不同的压力下，传感器的磁致弹性特性引起其磁化强度的变化，从而改变了高阶谐波场的振幅。建立了压力对传感器高次谐波场影响的理论模型。实验结果表明，压力传感器产生的二阶谐波场与周围流体压力相关，与理论结果一致。此外，它表明，传感器具有良好的重复性和稳定性，最小的漂移。具有较小尺寸的传感器被示出具有更高的灵敏度，但与较大的对应物相比具有更低的压力范围。由于传感器信号还取决于传感器相对于激励/检测线圈的位置，因此开发了校准算法以消除由于传感器位置变化而引起的信号变化。由于其无线和无源特性，该传感器可用于连续和长期监测难以接近区域的压力。例如，具有这些能力的传感器适合用于需要永久植入和长期监测的生物医学应用。
A wireless sensor based on the magnetoelastic, magnetically soft ferromagnetic alloy was constructed for remote measurement of pressure in flowing fluids. The pressure sensor was a rectangular strip of ferromagnetic alloy Fe40Ni38Mo4B18adhered on a solid polycarbonate substrate and protected by a thin polycarbonate film. Upon excitation of a time-varying magnetic field through an excitation coil, the magnetically soft sensor magnetized and produced higher order harmonic fields, which were detected through a detection coil. Under varying pressures, the sensor's magnetoelastic property caused a change in its magnetization, altering the amplitudes of the higher order harmonic fields. A theoretical model was developed to describe the effect of pressure on the sensor's higher order harmonic fields. Experimental observations showed the second-order harmonic field generated by the pressure sensor was correlated to the surrounding fluid pressure, consistent with the theoretical results. Furthermore, it was demonstrated that the sensor exhibited good repeatability and stability with minimal drift. Sensors with smaller dimensions were shown to have greater sensitivity but lower pressure range as compared to their larger counterparts. Since the sensor signal was also dependent on the location of the sensor with respect to the excitation/detection coil, a calibration algorithm was developed to eliminate signal variations due to the changing sensor location. Because of its wireless and passive nature, this sensor is useful for continuous and long-term monitoring of pressure at inaccessible areas. For example, sensors with these capabilities are suitable to be used in biomedical applications where permanent implantation and long-term monitoring are needed.