铯光泵磁力仪测频方法的研究和实现  

Research and Implementation of Frequency Measurement Method for Cesium Optically Pumped Magnetometer

作　　者：卞骁炜 李醒飞[1] 李立[1] 杨颖[2] 

机构地区：[1]天津大学精密测试技术及仪器国家重点实验室,天津300072 [2]天津职业技术师范大学自动化与电气工程学院,天津300222

出　　处：《传感技术学报》2016年第9期1305-1310,共6页Chinese Journal of Sensors and Actuators

基　　金：国家自然科学基金项目(61503283);天津市应用基础与前沿技术研究计划项目(青年项目)(15JCQNJC02400)

摘　　要：铯光泵磁力仪需要通过测量磁共振频率换算得到被测磁场值。以全同步测频方法为基础,提出一种改进的测频方法,并进行了误差分析。通过判断连续两次测量中的被测信号周期个数是否一致对计数值进行处理,二者一致时进行频率换算,否则计数值被丢弃。通过该方法可以将最大误差减小到原来的一半。设计了基于FPGA的测频系统,对改进的方法进行验证,结果表明,改进后方法的误差明显下降,证实了改进方法的有效性。被测频率换算成对应磁场值,改进方法的测频的绝对精度满足设计要求。It is necessary for cesium optically pumped magnetometer to measure magnetic resonance frequency andchange it to magnetic field intensity. An improved method was proposed to reduce errors based on complete synchro-nization frequency measurement method. When the numbers of measured signal cycles in two consecutive measure-ments are the same,the count value will be used to calculate the frequency of the measured signal,or it will be dis-carded. The biggest error of the improved method is as half as the original method.A FPGA-basedfrequency mea-surement system was designed and implemented. The results of the experiment show that the improved method caneffectively reduce errors and the absolute accuracy changed tomagnetic field intensity meets the design requirement.

关 键 词：磁力仪 频率测量 全同步 FPGA 误差 

分 类 号：TM935[电气工程—电力电子与电力传动] P716.82[天文地球—海洋科学]