双真空结构设计对氢原子钟温度灵敏度的改善研究

Vacuum Thermal Insulation of Thermostat Control Unit of Hydrogen Atomic Clock

介绍了一种应用于氢原子钟的双真空结构设计,将电子控温系统置于真空环境之中。真空绝热设计大大改善了氢原子钟物理保温性能,为电子控温系统创造了更为宽裕的反应时间。实验结果表明改进后的氢原子钟温度灵敏度由1×10-14/℃提高到2.5×10-15/℃,与国际最高水平相当(1×10-15/℃)。

Vacuum thermal insulation of the thermostat control unit of hydrogen atomic clockwas physically modeled,numerically simulated with software package Ansys,and experimentally evaluated to reduce the negative impact of environmental temperature on its accuracy. The influence of the thermal insulation conditions,such as the pressure in the vacuum layer,vacuum wall materials,and environment temperature,on the temperature sensitivity was evaluated. The prototyped vacuum thermal insulator was designed,constructed,and tested. The test results show that the newly-developed vacuum thermal insulationsignificantly reduced the temperature sensitivity of the hydrogen atomic clock from 1 × 10^-14/ ℃ to 2. 5 × 10^-15/ ℃,close to the best result reported（ 1 × 10^-15/ ℃）.