基于GPS授时的高精度光泵磁力仪计频方法
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摘要
针对航空超导全张量系统中高精度的磁场测量需求以及应用特点,采用一种新型频率测量方法可以更精确的测量光泵频率,从而可以更为精确的测量磁场。文中介绍了利用GPS授时信号作为闸门时间来进行频率测量的方法,并重点阐述了其设计方法;然后给出了该方法在50～300 k Hz的测量结果,试验表明该方法明显优于普通晶振提供闸门时间的频率测量方法,且在该频率段内最大误差小于0.02 Hz,同时验证了该方法达到实用要求且解决了航空超导全张量系统中使用晶振造成的电磁兼容问题及系统小型化问题。
To meet the high precision magnetic field measurement characteristics in aviation superconducting full tensor system,a new frequency measurement method to measure the frequency of the optical pumping magnetormeter was used,so that the magnetic field can be measured more accurately.In this paper,the method of using GPS timing signal as gate time was introduced,and its design method is explicated in detail.Then,the range of measured frequency was given at 50 ～ 300 k Hz.Experimental results show that this method is superior to the ordinary frequency measurement method of providing gate time for crystal oscillators.maximum error value within the frequency band is less than 0.02 Hz.The experiment shows that the method meets the practical requirements and solves the problem of EMC caused by ordinary crystal in aviation superconducting full tensor system and the system miniaturization problem.
To meet the high precision magnetic field measurement characteristics in aviation superconducting full tensor system,a new frequency measurement method to measure the frequency of the optical pumping magnetormeter was used,so that the magnetic field can be measured more accurately.In this paper,the method of using GPS timing signal as gate time was introduced,and its design method is explicated in detail.Then,the range of measured frequency was given at 50 ～ 300 k Hz.Experimental results show that this method is superior to the ordinary frequency measurement method of providing gate time for crystal oscillators.maximum error value within the frequency band is less than 0.02 Hz.The experiment shows that the method meets the practical requirements and solves the problem of EMC caused by ordinary crystal in aviation superconducting full tensor system and the system miniaturization problem.
引文
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[7]黎山峰,杨雷,孙建军.基于NiosⅡ的FPGA频率计设计与实现[J].仪表技术与传感器,2016(8):105-108.
[2]张昌达.航空磁力梯度张量测量---航空磁测技术的最新进展[J].工程地球物理学报,2006,3(5):354-361.
[3]张谨,宗发保,邹鹏毅,等.基于FPGA的铯光泵磁力仪频率计设计[J].海洋测绘,2015,35(2):80-82.
[4]Budker,D.and Romalis,Optical magnetometry[M].Nat Phys,2007,3(4):227-234.
[5]李云鹏,王劲东,李磊,等.一种用于光泵磁力仪频率计的频率测量方法:201710113556.5[P].2017-06-09.
[6]陈丽锋,孟瑞,冯希.频率测量研究综述[J].电力电子,2011,24(2):50-54.
[7]黎山峰,杨雷,孙建军.基于NiosⅡ的FPGA频率计设计与实现[J].仪表技术与传感器,2016(8):105-108.