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Time base evaluation for atom gravimeters.

Jiafeng Cui1, Yaoyao Xu1, Lele Chen1

  • 1MOE Key Laboratory of Fundamental Physical Quantities Measurements, School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China.

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This summary is machine-generated.

This study calibrates time base bias in atom gravimeters using the instrument itself. This method achieves high accuracy, improving gravity measurements for advanced applications.

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Area of Science:

  • Atomic physics
  • Geophysics
  • Metrology

Background:

  • Absolute gravity measurements critically depend on precise timekeeping.
  • Standard 10 MHz frequency standards are commonly used as time bases.
  • Potential time base bias can impact the accuracy of atom-interferometry-based gravity measurements.

Purpose of the Study:

  • To investigate the influence of time base bias on atom gravimetry.
  • To develop and present an in-situ calibration method for time base bias using an atom gravimeter.
  • To constrain the error in gravity measurements resulting from time base bias.

Main Methods:

  • Utilizing a microwave source referenced to the time base to detect frequency shifts.
  • Employing Ramsey spectroscopy with the 87Rb clock transition as a frequency discriminator.
  • Leveraging free-fall cold atoms and atom gravimeter techniques to measure energy level shifts.

Main Results:

  • Successfully calibrated time base bias with an accuracy of 0.6 mHz.
  • Constrained the corresponding error in gravity measurements to 0.1 μGal.
  • Demonstrated that the calibration meets the requirements of state-of-the-art gravimeters.

Conclusions:

  • The developed onsite calibration method effectively quantifies time base bias in atom gravimeters.
  • This technique significantly improves the accuracy of absolute gravity measurements.
  • The findings are crucial for the reliable application of advanced atom gravimeters in various fields.