Apparatuses for verifying the precision of gravimeters with lifting spherical source masses.
Apparatuses for verifying the precision of gravimeters with lifting spherical source masses.
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DOI：
10.1063/5.0122732
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发表时间：
2022-12
期刊：
影响因子：
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通讯作者：
Qiangbing Mao;Hao Xu;Yuan Cheng;Rui Liu;Tong Huang;Jiaojiao Huang;Qing Li
中科院分区：
文献类型：
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作者：
Qiangbing Mao;Hao Xu;Yuan Cheng;Rui Liu;Tong Huang;Jiaojiao Huang;Qing Li
建立了两个球源质量提升装置，并用于验证重力仪的精度。333 kg源质量产生的最大加速度为200 nm/s2，不确定度为0.31 nm/s2，对应的相对不确定度为0.16%。在评估了温度效应、重力仪漂移、大气效应和潮汐效应之后，得到了1 nm/s2的综合不确定度。用两台仪器对一台CG 6重力仪进行了测试，在误差范围内，实测加速度与理论值一致。在一台仪器上使用两台CG 6重力仪进行差分测量，这提供了对环境噪声影响（如重力潮汐、大气效应和漂移）的共模抑制。两台重力仪测得的加速度之差为199 ± 6 nm/s ~ 2，与用仪器Ⅱ测得的加速度之差200 ± 1 nm/s ~ 2相一致。我们的设备提供了重力仪精度的验证，其不确定度为1 nm/s2，这是迄今为止达到的最低不确定度之一。给出了几何量和质量分布的确定方法，并进行了详细的误差分析。本文所采用的误差分析方法和差分测量方法对重力测量有一定的参考价值。
Two apparatuses with lifting spherical source masses are built and used to verify the precision of gravimeters. The 333-kg source mass produces a maximum acceleration of 200 nm/s2 with an uncertainty of 0.31 nm/s2, which corresponds to a relative uncertainty of 0.16%. After evaluating the temperature effect, drift of the gravimeter, the atmospheric effect, and the tidal effect, a combined uncertainty of 1 nm/s2 is obtained. One CG6 gravimeter is tested using two apparatuses, the measured accelerations agree with the theoretical values within the error range. Differential measurement with two CG6 gravimeters on one apparatus is performed, which provides a common-mode rejection of the effects due to ambient noise, such as the gravity tide, atmospheric effect, and drift. The difference in acceleration measured by the two gravimeters is determined to be 199 ± 6 nm/s2, which agrees well with the value 200 ± 1 nm/s2 obtained by using apparatus II. Our apparatuses provide a verification of the precision of gravimeters with an uncertainty of 1 nm/s2, which is one of the lowest uncertainties reached so far. The determination of geometrical metrology and mass distribution and detailed error analysis are presented. The methods on error analysis as well as differential measurement used in our work are helpful for gravity measurement.