Subjects: Astronomy >> Astrophysical processes submitted time 2023-01-17 Cooperative journals: 《天文研究与技术》
Abstract： The purpose of this design is to realize the digital temperature control of the hydrogen maser. Is based on the basic principle of temperature detection and control design of a two-stage temperature control system (including the hydrogen maser inside the furnace and the furnace), the temperature control system is mainly composed of bridge circuit, analog-to-digital conversion circuit, temperature calculation and PID (proportional integral differential) control system, PWM (pulse width modulation) output circuit, heating wire. When the ambient temperature fluctuates from 21℃ to 25℃, the digital temperature control system achieves the temperature stability of 0.002℃, which proves the feasibility of the digital board to control the temperature of the hydrogen maser.
Subjects: Astronomy >> Astrophysical processes submitted time 2022-10-17 Cooperative journals: 《天文研究与技术》
Abstract： In order to reduce the relative change rate of the transition frequency of the hydrogen masers caused by the inhomogeneous C field, two designs of C field components, three-segment solenoids and four sets of coils, are proposed. Using the high-order expansion of the magnetic field on the axis, the ampere-turn ratio and the solenoid spacing were calculated when the three-segment solenoid with L=0.05-0.5 constructed a uniform magnetic field. The finite element analysis of the magnetic field is carried out with L=0.2-0.45, and the magnetic field non-uniformity distribution with different widths is given. Among them, the maximum non-uniformity with L=0.45 in the storage bubble area is 0.105%, and the corresponding relative change rate of transition frequency is1.02×10-13 . Using the same method, the ampere-turn ratio and spacing between coils when four or five sets of coils construct a uniform magnetic field are calculated, and the finite element simulation of the magnetic field in the coil is carried out, and the non-uniformity distribution is given. The maximum non-uniformity of the magnetic field in the storage bubble region in the four sets of coils is 0.066%, and the corresponding transition frequency relative change rate is 6.42×10-14
Subjects: Astronomy >> Astrophysical processes submitted time 2020-01-06 Cooperative journals: 《天文研究与技术》
Abstract：氢原子钟作为一种精密的授时守时仪器，在科学研究与工程应用中发挥着重要作用，但目前我国原子钟还存在设备故障、可靠性差等问题。为了简化技术人员排查流程、提升维修效率，文章提出了一种采用机器学习方法，将氢钟历史运行数据作为训练样本，结合DBSCAN及人工神经网络算法得到氢钟诊断模型，从而大幅简化故障排查过程的方法。实验中将训练好的模型部署到嵌入式设备上，并把实时预判结果给技术人员作为参考，证实了这种方法的可行性及有效性。
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