Abstract
Optical clocks have great potential to generatie high-performance atomic time scales. This paper introduces the basic idea of generating a local time scale steered to NIM-Sr1 optical lattice clock of the National Institute of Metrology (NIM), and the evaluation of the noise parameters of the HM57 hydrogen maser which is currently used as the flywheel oscillator. When NIM-Sr1 is operated as a reference clock, it runs consecutively with interrupts. A post-processing steering algorithm is designed to match this operation condition with the comparison data between NIM-Sr1 and HM57 in September and October 2022. The post-processing time scale TS(P) steered to NIM-Sr1 has a maximum time deviation of 0. 7 ns compared with TT(BIPM22) within 60 days. Moreover, a system with dedicated hardware and software is built to generate a real-time physical time scale by steering HM57 to NIM-Sr1. The generated real-time physical time scale TS(R) in April 2023 is evaluated with a maximum time deviation of 0. 89 ns compared with UTC within 30 days.
| Translated title of the contribution | Research on generating a local time scale with NIM-Sr1 optical lattice clock |
|---|---|
| Original language | Chinese (Traditional) |
| Pages (from-to) | 137-144 |
| Number of pages | 8 |
| Journal | Yi Qi Yi Biao Xue Bao/Chinese Journal of Scientific Instrument |
| Volume | 45 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - Feb 2024 |
| Externally published | Yes |