Ackmann J J
Department of Veterans Affairs Medical Center, Milwaukee, WI.
Ann Biomed Eng. 1993 Mar-Apr;21(2):135-46. doi: 10.1007/BF02367609.
Analytic techniques that have been successfully employed in materials science, and to a lesser extent in the study of biologic systems, have potential for improving the application of bioelectric impedance provided that both real and imaginary impedance components can be measured with sufficient accuracy over a given frequency range. Since biologic tissue, particularly animal tissue, is typically highly conductive, phase angles are small, making accurate measurements difficult. A practical four-terminal system employing commercial lock-in amplifiers is described and error sources and corrective techniques are discussed.
已成功应用于材料科学，且在生物系统研究中应用程度稍低的分析技术，有潜力改进生物电阻抗的应用，前提是在给定频率范围内，实部和虚部阻抗分量都能以足够的精度进行测量。由于生物组织，尤其是动物组织通常具有高导电性，相角很小，使得精确测量变得困难。本文描述了一种采用商用锁相放大器的实用四端系统，并讨论了误差来源和校正技术。
