论文标题
用绝对原子重量表对超导重量表的校准
Calibration of a superconducting gravimeter with an absolute atom gravimeter
论文作者
论文摘要
我们提出了27天的长期观点测量，可对绝对冷原子重量表（CAG）和相对IGRAV超导重量表进行校准，我们用来校准IGRAV量表因子。这使我们能够将CAG的长期稳定性降低到0.5〜nm.s $^{-2} $的水平。我们研究了测量持续时间对确定相关因子的不确定性的影响，并表明它限于我们冷原子重量表的彩色噪声限制为3 \ textperth。与额外的FG5X绝对重量表一起进行的3天长度测量会议使我们能够直接比较用两个不同的绝对仪表获得的校准结果。基于我们的分析，我们期望通过改善其长期稳定性，CAG将允许在仅一日并发测量的最大测量值之后，将IGRAV量表因子校准比每毫米水平（1 $σ$置信度）更好。
We present a 27-days long common view measurement of an absolute cold atom gravimeter (CAG) and a relative iGrav superconducting gravimeter, which we use to calibrate the iGrav scale factor. This allowed us to push the CAG long-term stability down to the level of 0.5~nm.s$^{-2}$. We investigate the impact of the duration of the measurement on the uncertainty in the determination of the correlation factor and show that it is limited to about 3\textperthousand~by the coloured noise of our cold atom gravimeter. A 3-days long measurement session with an additional FG5X absolute gravimeter allows us to directly compare the calibration results obtained with two different absolute meters. Based on our analysis, we expect that with an improvement of its long term stability, the CAG will allow to calibrate the iGrav scale factor to better than the per mille level (1$σ$ level of confidence) after only one-day of concurrent measurements for maximum tidal amplitudes.
