电导及微分电导测量方法的研究  

Research on Measurement Method of Conductance and Differential Conductance

作　　者：肖文波[1,2] 何兴道[1,2] 陈学岗[1,2] 王庆[2] 

机构地区：[1]南昌航空大学无损检测技术教育部重点实验室,南昌330063 [2]南昌航空大学大学物理国家级实验教学示范中心,南昌330063

出　　处：《电测与仪表》2009年第9期10-13,64,共5页Electrical Measurement & Instrumentation

基　　金：博士启动基金(EA200908017);江西省教育厅赣教技字[2007]179号基金资助课题

摘　　要：介绍了一种基于锁相放大器和积分电路建立的电导和微分电导测量系统。理论上讨论了实现电导和微分电导测量的物理机制,并且通过实验进行了验证。实验中通过测量非线性样品、样品并联系统电阻以及在室温下电导及微分电导随直流偏压的变化,发现样品电导与并联系统电导的差别在于电阻的电导,证明了测量方法的正确性,且把微分电导的测量精度相比电导测量精度提高了大约一个数量级。另外,测量系统具有实现微弱信号的放大功能,此项研究可以应用到微弱信号检测等领域。In this paper, it is introduced that a new conductance and differential conductance measurements system is realized based on the lock-in amplifier and integral circuit; The physical mechanism is discussed by the theoretical study. Then, experiments proved that theoretical analysis. The conductance and differential conductance of the non-linear sample and the system of sample paralleled resistor were measured at room temperature. It finds that the conductance difference of the sample and the paralleled system is the conductance of resistor, which proves the correctness of measurement methods; it also finds that differential conductance measurement accuracy is higher than the measured conductance about an order of magnitude. The measurements system has a weak signal amplification function. This research can be applied to weak signal detection field.

关 键 词：微弱信号 电导 微分电导 测量 

分 类 号：TM935[电气工程—电力电子与电力传动] TH832.1[机械工程—仪器科学与技术]