基于磁声电耦合的电导率测量实验系统  

Design and Realization of the Non-contact Conductivity Measurement System Based on the Coupling of the Electromagnetic Field and Acoustic Field

作　　者：郭亮[1] 姜文聪[1] 刘广孚[1] 夏正武[2] 

机构地区：[1]中国石油大学(华东)信息与控制工程学院,山东青岛266580 [2]中国科学院电工研究所,北京100190

出　　处：《实验室研究与探索》2015年第6期72-76,共5页Research and Exploration In Laboratory

基　　金：国家自然科学基金资助项目(61401514);中国石油大学(华东)教学改革项目(JY-B201247)

摘　　要：为了验证磁声电非接触式电导率成像检测方法,研制了一种基于电磁场和声场耦合效应的非接触式电导率测量实验系统。论述了电磁场和超声波耦合的基本原理,设计并实现了非接触式电导率测量实验系统。针对激励脉冲干扰强、信号微弱的特点,研制了微弱电磁信号检测系统和屏蔽式电磁检测实验平台,同时还研制了高压、窄脉冲超声激励源。将8种不同浓度氯化钠溶液制成不同电导率的明胶仿体,利用上述自制实验平台对其进行了磁-声-电非接触式电导率测量实验,测量结果与标定电导率基本吻合。利用磁声电效应对低电导率仿体进行了非接触式测量实验,验证了其在生物组织非接触式电导率测量方面的有效性。This paper introduces an experimental system for non-contact conductivity measurement based on the coupling of the electromagnetic field and acoustic field, to verify the ability of the magneto-acousto-electrical tomography（ MAET） in biological tissues. Firstly,the basic theory is discussed for the coupling of the electromagnetic field and acoustic field. Secondly,the non-contact conductivity measurement system is designed and realized. In order to overcome the strong interference of the ultrasonic pulse and obtain the weak MAET signal,we have designed and realized the detecting system for weak electromagnetic signal,the shielded platform for electromagnetic signal detection and the ultrasonic excitation source with narrow pulse and high voltage. Eight kinds of phantoms with different conductivities are made with different Na Cl solutions. These phantoms are used in the non-contact conductivity measurement with the customized system and the results of the experiment are consistent with the reference value. The non-contact conductivity measurement is conducted with the customized system and the validity of this method is verified by this experimental study for the first time.

关 键 词：非接触式电导率测量 超声波 电磁场 耦合场 

分 类 号：R318.04[医药卫生—生物医学工程]