摘要
对自1991年以来，在上海天文台氢原子钟上使用的热敏电阻控温系统的几个相关问题进行了讨论与分析。该系统的控温精度可达±5％，粗测温度复制性优于±3‰。
Through a series of experiments, the obvious advantage about the sensitivity of thethermistors, comparing with platinum resistance, has been shown. In order to prevent theHydrogen clock from frequency drift, the temperature gradient along its vacuum covermust be monit0red and removed.A number of thermistors placed at different parts of a Hydrogen clock are used in thethermal control system and the consistency of these thermistors has been ensured by careful1y selecting them. The long period stability of the thermistors were tested to be betterthan 2‰ per year and the variation of their resistance with the environment can be alsonegligible. In addition, some points for attention to using thermistors for the thermal control system are mentioned.
出处
《陕西天文台台刊》
CSCD
1997年第6期24-28,共5页
Publications of The Shaanxi Astronomical Observatiory
关键词
氢钟
热敏电阻
热控系统
时钟
Hydrogen Clock
Thermistor
Thermal Control System
