氢钟智能温度控制及CAT控制电压自动补偿系统设计与分析

Design and Analysis of Intelligent Temperature Control and Temperature Compensating System of CAT for Hydrogen Clock

针对当前氢钟温度控制系统所存在的不足,提出了全新的设计思路:综合三路温度控制在一个系统中,缩小控制电路的体积,同时提高温度控制系统的可操作性。考虑到氢钟腔体自动调谐的变容二极管电压存在漂移甚至超出正常控制范围,这将直接影响氢钟频率稳定度和频率漂移率性能指标。结合温度控制系统,设计了Vdio自动补偿系统。系统硬件设计以32位ARM处理器为核心,由于处理器芯片本身是个片上系统,所以不仅功能较强,还大大简化了系统的板级设计,软件设计引入了实时操作系统内核UCOS-Ⅱ。系统软硬件相结合,能很好地实现监控任务。

This paper presents a new design of temperature control system of hydrogen clock. By integrating three temperature control units into one system, the design can reduce size of circuit and simplify temperature control. This design includes two parts： hardware and software. In the hardware design, we select 32 bits ARM （Advanced RISC Machine） processor LPC2132, which is powerful and helpful to reduce the complexity of circuit board. In the software design, we introduce real time operation system UCOS-II （Micro Controller Operation System）. By using it, we can enhance real time performance of the temperature control system. In addition, voltage of varactor which controls CAT （cavity auto tuning） in hydrogen clock may drift out of normal range, and the voltage drift will influence frequency stability and drift rate of hydrogen clock directly. Therefore, we bring forward an idea of temperature compensating for CAT, which based on the new temperature control system.