可搬运钙离子光钟嵌入式控制系统实时性分析  

Real-Time Performance Analysis of Embedded Control System for Transportable ^(40)Ca^(+)Ion Optical Clock

作　　者：王斌 胡帅[3] 张华青 黄垚 高克林 管桦 WANG Bin;HU Shuai;ZHANG Hua-qing;HUANG Yao;GAO Ke-lin;GUAN Hua(Key Laboratory of Time Reference and Applications,Innovation Academy for Precision Measurement Science and Technology,Chinese Academy of Sciences,Wuhan 430071,China;University of Chinese Academy of Sciences,Beijing 100049,China;Huazhong Institute of Electro-Optics-Wuhan National Laboratory for Optoelectronics,Wuhan 430223,China;Wuhan Institute for Quantum Technology,Wuhan 430206,China)

机构地区：[1]时间基准及应用重点实验室,中国科学院精密测量科学与技术创新研究院,湖北武汉430071 [2]中国科学院大学,北京100049 [3]华中光电技术研究所-武汉光电国家研究中心,湖北武汉430223 [4]武汉量子技术研究院,湖北武汉430206

出　　处：《光学与光电技术》2024年第6期122-128,共7页Optics & Optoelectronic Technology

基　　金：国家重点研发计划(2022YFB3904001、2022YFB3904004);国家自然科学基金(11934014、12320101003);中国科学院稳定支持基础研究领域青年团队计划(YSBR-055、YSBR-085);中国科学院青年创新促进会优秀会员(Y2022099);湖北省创新群体项目(2022CFA013)资助。

摘　　要：随着激光冷却技术、超窄线宽激光器和飞秒光学频率梳的飞速发展,目前实验室光钟的不确定度和稳定度都已经到了小系数10^(-18)水平。小型化、集成化可搬运光钟在下一代秒定义、引力势测量、高程差测量、地球固体潮汐测量等方面有自己独特的优势,光钟从实验室走向实际应用过程中,控制系统需要完成小型化及集成化设计,且性能指标不降低。在光钟运行过程中,控制系统延时造成的死时间会影响可搬运光钟的系统稳定性指标。为了降低死时间对光钟稳定性的影响,以Xilinx推出的zynq架构的芯片为处理核心搭建硬件平台,以嵌入式Linux系统为软件核心,设计了钙离子光钟嵌入式控制系统。从钙离子光钟嵌入式控制系统的中断实时性要求出发,分析了新设计的硬件平台对光钟运行时序延时的影响,经分析,控制系统对系统稳定度的影响在2×10^(-16)以下,可满足可搬运钙离子光钟对控制系统实时性的要求。With the rapid development of laser cooling technology,ultra-narrow linewidth lasers,and femtosecond optical frequency combs,the uncertainty and stability of laboratory optical clocks have now reached a level of small coefficients of 10^(-18).Miniaturized,integrated,and portable optical clocks have unique advantages in next-generation"second"definitions,gravitational potential measurements,elevation difference measurements,and solid earth tide measurements.In the process of moving from the laboratory to practical applications,the control system needs to complete miniaturization and integration design without compromising performance indicators.During the operation of the optical clock,the dead time caused by the control system delay affects the system stability indicators of the transportable optical clock.To reduce the impact of dead time on the stability of the optical clock,a hardware platform is built using Xilinx's Zynq architecture chip as the processing core and embedded Linux system as the software core.An embedded control system for transportable ^(40)Ca^(+) ion optical clock is developed.Starting from the real-time interrupt requirements of the embedded control system of the ^(40)Ca^(+) ion optical clock,this paper analyzes the impact of the newly developed hardware platform on the timing delay during the operation of the optical clock.Through analysis,it is found that the impact of the control system on system stability is below 2×10^(-16),which can meet the real-time requirements of the control system for transportable ^(40)Ca^(+) ion optical clock.

关 键 词：钙离子光钟 LINUX操作系统 实时性 死时间 系统稳定度 

分 类 号：TH714[机械工程—测试计量技术及仪器]