Accuracy estimation of the IfE gravimeters Micro-g LaCoste gPhone-98 and ZLS Burris Gravity Meter B-64

Accuracy estimation of the IfE gravimeters Micro-g LaCoste gPhone-98 and ZLS Burris Gravity Meter B-64
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IfE 重力计 Micro-g LaCoste gPhone-98 和 ZLS Burris 重力计 B-64 的精度估计

DOI:
10.1007/1345_2015_29
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发表时间:
2013
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影响因子:
--
通讯作者:
Gitlein
Gitlein
中科院分区:
--
文献类型:
--
作者:
Schilling;Gitlein

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目前,与超导重力仪相比,现代弹簧重力仪是最灵活、技术简单、相对便宜的长时间记录解决方案。我们调查了最先进的弹簧重力仪Micro-g LaCoste gPhone-98和ZLS Burris重力仪B-64的Erdmessung研究所(IfE)的精度。用这两种仪器在5个具有高低微地震噪声的台站记录了几个月的重力。同时测量与这两种仪器以及并行记录的ZLS Burris重力仪与GWR仪器天文台超导重力仪OSG-054在Onsala(瑞典)进行了调查。潮汐分析用于评估时间序列的质量。日振幅因子和半日振幅因子在1 更好地从伯里斯和OSG重力仪在Onsala的记录。除了重力记录外,还进行了一些校准实验,以测试仪表的长期稳定性。两台重力仪的线性校准因子稳定在3 × 10−4。gPhone-98的漂移随着时间的推移而减少,目前每天以nm/s2的线性因子减少。另一方面,Burris B-64的仪器漂移目前不能用线性因子降低。
Presently, modern spring gravimeters are the most flexible, technically simple, and comparatively cheap solution for recordings over extended time periods in contrast to superconducting gravimeters. We investigate the accuracy of the state-of-the-art spring gravimeters Micro-g LaCoste gPhone-98 and ZLS Burris Gravity Meter B-64 of the Institut für Erdmessung (IfE). With both instruments gravity was recorded for periods of several months at five stations with high and low microseismic noise. Simultaneous measurements with both instruments as well as the parallel recording of the ZLS Burris gravimeter with the GWR Instruments Observatory Superconducting Gravimeter OSG-054 in Onsala (Sweden) are investigated. Tidal analysis is used to assess the quality of the time series. Diurnal and semi-diurnal amplitude factors agree at the level of 1  and better from recordings of Burris and OSG gravimeters in Onsala. In addition to gravity recordings a number of calibration experiments were carried out to test the long-term stability of the meters. The linear calibration factor of both gravimeters is stable to 3 × 10−4. The drift of the gPhone-98 decreased over time and is currently reduced with a linear factor ofnm/s2per day. The instrumental drift of Burris B-64 on the other hand can currently not be reduced with a linear factor.
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