论文标题
设计，开发和比较两个不同的测量设备，以确定生物阻抗的相移的时间偏移
Design, Development and Comparison of two Different Measurements Devices for Time-Resolved Determination of Phase Shifts of Bioimpedances
论文作者
论文摘要
生物阻抗测量是确定有机组织组成的一种非侵入性方法。为了测量两个电极之间的复杂生物阻抗，将具有恒定振幅的交替电流注入组织中。开发的电压下降用于计算测试的阻抗的实际和虚构部分。过去的测量结果表明，心脏的跳动可能会影响测试的阻抗的测量相移。在这项工作中，开发了硬件系统，能够通过高分辨率来衡量生物阻抗相位变化的变化。使用了两种不同的测量方法。第一种方法是一个模拟电路，该电路是在先前项目中开发的。另一种方法使用集成电路AFE4300（Texas Instruments）[1]。两种方法的结果均通过MicroController（Atmel Corp.的XMEGA256A3BU）传输到主机PC。在主机PC上，通过开发的LabView程序实现了测量值和嵌入式系统的控制。这项工作包括开发硬件和软件，以及对两种测量方法的准确性进行比较。对系统验证的结果是，两种测量方法的有效分辨率约为0.3°。
Bioimpedance measurements are a non-invasive method to determine the composition of organic tissue. For measuring the complex bioimpedance between two electrodes, an alternating current with a constant amplitude is injected into the tissue. The developed voltage drop is used to calculate the real and imaginary part of the impedance under test. Measurements in the past indicated that it could be possible that the beating of the heart has an effect on the measured phase shift of the impedance under test. In this work a hardware system is developed, capable of measuring changes of the bioimpedance phase shift with high resolution. Two different measurement methods are used. The first method is an analog circuit, which has been developed in a previous project. The other method uses the integrated circuit AFE4300 (Texas Instruments) [1]. The results of both methods are transmitted with a microcontroller (Xmega256A3BU from Atmel Corp.) via the USB interface to a host PC. On the host PC the visualization of the measurements and the control of the embedded system is achieved with a developed LabView program. The work includes the development of the hardware and software, as well as a comparison of the accuracy of the two measurement methods. The result of a verification of the systems is that both measurement methods have an effective resolution of about 0.3°.
