一种射频-脉冲激发式动态核极化磁场传感器  

A Kind of RF-Pulse Excitation DNP Magnetic Sensor

作　　者：谭超[1] 黄悦华[1] 

机构地区：[1]三峡大学电气与新能源学院,湖北宜昌443002

出　　处：《传感技术学报》2014年第5期605-609,共5页Chinese Journal of Sensors and Actuators

基　　金：国家基金(面上项目)(51371105);三峡大学人才启动基金项目(KJ2012B019)

摘　　要：介绍了一种基于自由基动态核极化效应的射频-脉冲激发式质子磁场传感器。分析了电子-质子双共振现象中电子顺磁共振对质子极化度强的影响;通过对氮氧自由基动态极化分析,提出了适合于此类自由基物质的射频-脉冲激发式动态核极化效应磁场传感器与仪器组成结构,并分析了传感器工作过程中质子运行规律。文章最后通过设计射频功率信号源模块,放大器和频率测量模块完成了测试样机的研制。对比测试结果表明:设计的动态核极化磁场传感器灵敏度高;精度测试结果表明:传感器在20 000 nT^100 000 nT范围内的测量不确定度约为0.3 nT。The paper introduces a kind of RF-pulse excitation Dynamic Nuclear Polarization （DNP）effect proton magnetometer. The electron-proton double resonance phenomenon and the dynamic nuclear polarization characteristics of nitroxide radicals were analyzed,the structure of the RF-pulse excitation DNP effect proton magnetometer based on nitroxide radicals and the working processing of magnetometer were given, and the magnetometer prototype was implemented by designing of each functional modules. The experiment results show that the magnetic field of the magnetic sensor prototype have high sensitivity ; The accuracy test results show that the measurement un- certainty is about 0.3 nT from 20000 nT to 100000 nT.

关 键 词：弱磁测量 动态核极化 动态核极化磁场传感器 自由基 

分 类 号：TB971[一般工业技术—计量学]