低温下生物组织的介电常数与电导率研究

Dielectric Property of Biomaterials During Cryopreserved

本研究应用波导传输发射法测量生物组织在-25℃～30℃时的介电常数与电导率.首先通过测量有机材料对测量系统进行验证,证明所提出的系统具有较好的测量精度与可重复性,然后测量了在生物组织中分布很广的脂肪的介电常数与电导率,给出了一个测量值分布范围,并讨论了单个样品的介电常数与电导率随温度变化的规律.工作目的是为研究微波降温和微波复温的非热效应提供物性参数,对其机理进行探索性工作.

This thesis deals with the preliminary phase of the research on the non-thermal effect of microwave on the Vitrification of Biomaterials. The goal of the thesis is to discover a reliable and effective method to accurately determine the dielectric of some biomaterials. At first, the discussion about the microwave methodology of the dielectric was presented. By comparison, the transmission line method was chosen as it could be easily implemented while still retaining a satisfactory precision. The second, the precision of the method was proved by measuring the dielectric of polymer. Then, the method was applied to measured the fat of swine at variable temperature points. The corresponding numerical solutions were determined with the help of software applications. At last, the discussion continued further with the generalization of the dielectric property of biomaterial varied with temperature based on the experimental data.