IAMS Upcoming Activities 原分所學術演講活動
消息來源：原分所
截止日期：2026-10-21
IAMS Lecture
中研院原分所演講公告
| Title | Transportable optical lattice clock for geodesy at the centimeter height level |
| Speaker | Dr. Ingo Nosske Physikalisch-Technische Bundesanstalt |
| Time | 10:30 AM, October 21 (Wednesday), 2026 |
| Venue | C. T. Chang Memorial Hall (NTU Campus), IAMS |
| Contact | Dr. Shayne Bennetts |
| Abstract | Transportable high-performance optical atomic clocks are currently being developed worldwide. Apart from applications in metrology and fundamental physics studies, due to relativistic redshifts of clock frequencies they serve as quantum sensors of the local gravity potential. If they are connected to distant atomic clocks via high-performance frequency comparison links, the frequency difference between the clocks measured remotely enables a direct determination of gravity potential differences with high spatial and temporal resolution. This method is called chronometric leveling.
Here I describe the second-generation transportable 87Sr optical lattice clock of PTB, which has been operational since 2023 and has demonstrated centimeter height resolution in the field. Taking all frequency shifts into account, its total systematic uncertainty is evaluated to be 2.1×10-18, which via the relativistic redshift corresponds to a height uncertainty of 1.9 cm. This is close to the lowest physical height uncertainties currently achieved in state-of-the-art satellite geodesy. The atomic clock is installed in an air-conditioned car trailer and has been successfully operated after transportation several times. I review recent off-campus measurement campaigns in England, southern Germany and Italy. |