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A new space metrology system successfully operated for months on the Tiangong space station. This dual-comb absolute-ranging payload achieved 13µm precision for space applications.

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Area of Science:

  • Space Science
  • Optical Metrology
  • Astronomy

Background:

  • Accurate distance measurements are crucial for space missions.
  • Previous metrology systems faced limitations in space environments.

Purpose of the Study:

  • To demonstrate sustained on-orbit operation of a dual-comb absolute-ranging payload.
  • To advance traceable space metrology for future space applications.

Main Methods:

  • A dual-comb absolute-ranging payload was delivered to the Tiangong space station.
  • The system performed interferogram acquisition in an extravehicular environment.

Main Results:

  • Sustained on-orbit interferogram acquisition was achieved.
  • The system demonstrated 13µm precision at a 1kHz update rate.
  • Stable operation was maintained over several months.

Conclusions:

  • The dual-comb payload is suitable for long-term space metrology.
  • This technology supports formation flying and deployable observatories.
  • Traceable space metrology capabilities have been significantly advanced.