磁选态铯原子钟弱信号直接采样方法研究  

Direct sampling method for weak signal of magnetically selected cesium atomic clock

作　　者：高天翔 王骥[1] 赵玉龙 董鹏玲 黄良育[1] 刘志栋[1] GAO Tianxiang;WANG Ji;ZHAO Yulong;DONG Pengling;HUANG Liangyu;LIU Zhidong(Vacuum Technology and Physics Laboratory,Lanzhou Institute of Physics,Science and Technology,Lanzhou 730000,China)

机构地区：[1]兰州空间技术物理研究所真空技术与物理重点实验室,兰州730000

出　　处：《中国空间科学技术》2021年第5期110-115,共6页Chinese Space Science and Technology

基　　金：国家自然科学基金(61471183)。

摘　　要：磁选态铯原子钟的输出频率与铯束管输出的弱电流信号有关,影响其频率稳定度。为了提高其频率稳定度技术指标,在对磁选态铯原子钟主伺服电路弱信号压频转换(V-F)和模/数(A/D)直接采样对比的基础上,设计了基于DSP28335芯片的A/D直接采样电路,利用CAN总线通信技术与主控CPU板进行通信,实现整钟闭环锁定的方案。通过试验与被测磁选态铯原子钟现有压频转换法进行对比,结果表明,所设计的A/D直接采样法较压频转换法减小了磁选态铯原子钟相对频率偏差范围,改善了短期频率稳定度,具有实用价值。The output frequency of the magnetically selected cesium atomic clock is related to the weak current signal output by the cesium beam tube,which affects its frequency stability.In order to improve its frequency stability,on the basis of the comparison between the weak signal voltage-frequency conversion and A/D(analog-to-digital)direct sampling of the main servo circuit of the magnetically selected cesium atomic clock,an A/D direct sampling circuit was designed based on the DSP28335 chip,using CAN bus communication technology to communicate with main control CPU board,and the whole-clock closed-loop locking scheme was realied.The experiment was compared with the existing voltage-frequency conversion method of the measured magnetically selected cesium atomic clock.The result shows that,compared with the voltage-frequency conversion method,the designed A/D direct sampling method reduces the relative frequency deviation range of the magnetically selected cesium atomic clock and improves the short-term frequency stability,presenting certain practical value.

关 键 词：磁选态铯原子钟 采样方法 压频转换 相对频率偏差 频率稳定度 

分 类 号：TB939[一般工业技术—计量学]