Abstract:
A cold rubidium atom fountain interferometry gravimeter with an active vibration isolator is demonstrated.The natural resonance frequency of the active vibration isolator is 0.016 Hz, and the vertical vibration noise isgreatly reduced by a factor of 100 from 0.1 to 1 Hz. After substantial suppression of the vibration noise, thegravimeter reaches a sensitivity of 5.5 × 10−8g/Hz1/2. We measured the local gravitational acceleration g bythis sensitive gravimeter with a resolution of 6.5 × 10−9g after 60 s and 1.5 × 10−9g after 2000 s integrationtime, which is comparable to the resolution of state-of-the-art atom gravimeters.
