Structured Approach and Impedance Spectroscopy Microsystem for Fractional-Order Electrical Characterization of Vegetable Tissues
Structured Approach and Impedance Spectroscopy Microsystem for Fractional-Order Electrical Characterization of Vegetable Tissues
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DOI：
10.1109/tim.2019.2904131
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发表时间：
2020-02-01
影响因子：
5.6
通讯作者：
Velasco-Medina, Jaime
中科院分区：
文献类型：
--
作者：
Cabrera-Lopez, John-Jairo;Velasco-Medina, Jaime
阻抗谱技术是近年来提出的一种简单、无创的生物材料阻抗谱测量技术，其基础是对生物材料阻抗谱的精确测量。该测量用于开发等效电气模型（EEM）并执行BM的电气表征。在本文中，我们提出了一个合适的方法，通过使用高精度的阻抗谱测量的基础上的结构化算法，一个灵活的IS微系统，和分数阶（FO）模型的蔬菜组织的高可靠性的电特性。所设计的微系统采用最少的离散电路和可编程的混合信号电路，并利用整数阶（IO）的EEMs进行了验证，即将IS测量结果与仿真结果进行了比较。此外，阻抗谱测量蔬菜组织使用的微系统进行。在这种情况下，由IO和FO微分方程描述的五个EEM用于使用Nelder-Mead“单纯形”算法执行参数优化。考虑到所获得的模拟结果和实验测量，可以提及的是，结构化方法适合于需要在扩频上测量生物阻抗的应用，诸如电IS（EIS）和电阻抗断层成像（EIT）。
Accuracy measurement of the impedance over a spread spectrum is the foundation of impedance spectroscopy (IS) technique, which has been recently proposed as a simple noninvasive technique for impedance spectrum measurement of a biological material (BM). This measurement is used to develop the equivalent electrical model (EEM) and to perform electrical characterization of the BM. In this paper, we propose a suitable approach for high-reliability electrical characterization of vegetable tissues by using a high-accuracy impedance spectrum measurement based on a structured algorithm, a flexible IS microsystem, and fractional-order (FO) models. The designed microsystem uses minimal discrete circuits and a programmable mixed-signal circuit, and it is validated by using EEMs of integer-order (IO), that is, the IS measures were compared with the simulation results. Also, impedance spectrum measures of vegetable tissues are carried out using the microsystem. In this case, five EEMs described by IO and FO differential equations are used to perform the parametric optimization using the Nelder-Mead "simplex" algorithm. Taking into account the obtained simulation results and experimental measures, it is possible to mention that the structured approach is suitable for applications that require to measure the bioimpedance over a spread spectrum, such as electrical IS (EIS) and electrical impedance tomography (EIT).