Simultaneous gravity and gradient measurements from a recoil-compensated absolute gravimeter

Niebauer, T. M.; Billson, Ryan; Ellis, Brian; Mason, Bryon; Westrum, Derek van; Klopping, F. J.

doi:10.1088/0026-1394/48/3/009

Cited by 39 publications

(54 citation statements)

References 7 publications

(8 reference statements)

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“…In [12], one free fall per 30 s was chosen, leading to an Allan standard deviation about twice worse than if one drop per 10 s would have been chosen. On one hand, the FG5 dropping chamber [13] allows drops of 2 s which can improve notably the stability of FG5. On the other hand, alike the FG5, that uses a sophisticated super-spring system [14], various vibration rejection systems have been demonstrated and gradually improved over the last years to reject ground noise for atom sensors.…”

Section: Introductionmentioning

confidence: 99%

Stability comparison of two absolute gravimeters: optical versus atomic interferometers

Gillot¹,

Francis²,

Landragin³

et al. 2014

Metrologia

158

136

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We report the direct comparison between the stabilities of two mobile absolute gravimeters of different technology: the LNE-SYRTE Cold Atom Gravimeter and FG5X#216 of the Université du Luxembourg. These instruments rely on two different principles of operation: atomic and optical interferometry. The comparison took place in the Walferdange Underground Laboratory for Geodynamics in Luxembourg, at the beginning of the last International Comparison of Absolute Gravimeters, ICAG-2013. We analyse a 2h10 duration common measurement, and find that the CAG shows better immunity with respect to changes in the level of vibration noise, as well as a slightly better short term stability.

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Section: Introductionmentioning

confidence: 99%

Stability comparison of two absolute gravimeters: optical versus atomic interferometers

Gillot¹,

Francis²,

Landragin³

et al. 2014

Metrologia

158

136

View full text Add to dashboard Cite

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“…The FGI measured with the FG5-221 gravimeter between 2003 and 2012. In 2013, the FG5-221 was upgraded to the FG5X-221 model replacing the dropping chamber with a chamber incorporating a recoil compensating driving mechanism of the wagon that carries the test mass before and after the drop (Niebauer et al 2011). Also, the free-fall distance was increased.…”

Section: Absolute Gravity Observationsmentioning

confidence: 99%

Forty-three years of absolute gravity observations of the Fennoscandian postglacial rebound in Finland

Bilker‐Koivula

Mäkinen

Ruotsalainen

et al. 2021

J Geod

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Postglacial rebound in Fennoscandia causes striking trends in gravity measurements of the area. We present time series of absolute gravity data collected between 1976 and 2019 on 12 stations in Finland with different types of instruments. First, we determine the trends at each station and analyse the effect of the instrument types. We estimate, for example, an offset of 6.8 μgal for the JILAg-5 instrument with respect to the FG5-type instruments. Applying the offsets in the trend analysis strengthens the trends being in good agreement with the NKG2016LU_gdot model of gravity change. Trends of seven stations were found robust and were used to analyse the stabilization of the trends in time and to determine the relationship between gravity change rates and land uplift rates as measured with global navigation satellite systems (GNSS) as well as from the NKG2016LU_abs land uplift model. Trends calculated from combined and offset-corrected measurements of JILAg-5- and FG5-type instruments stabilized in 15 to 20 years and at some stations even faster. The trends of FG5-type instrument data alone stabilized generally within 10 years. The ratio between gravity change rates and vertical rates from different data sets yields values between − 0.206 ± 0.017 and − 0.227 ± 0.024 µGal/mm and axis intercept values between 0.248 ± 0.089 and 0.335 ± 0.136 µGal/yr. These values are larger than previous estimates for Fennoscandia.

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“…The commercial FG5 system is the succeeding generation of the JILA free-fall system which was developed at the Joint Institute of Laboratory Astrophysics, University of Colorado [17]. In 2012, the Hannover gravimeter was upgraded to the FG5X version [18] benefitting from the optimizations w.r.t. instrumental vibrations (recoil compensation), less sensitivity to Coriolis force and the longer free-fall distance of the test mass.…”

Section: Absolute Gravimetry With the Hannover Free-fall Gravimeter Fmentioning

confidence: 99%

Geodetic-Gravimetric Monitoring of Mountain Uplift and Hydrological Variations at Zugspitze and Wank Mountains (Bavarian Alps, Germany)

Timmen¹,

Gerlach²,

Rehm³

et al. 2021

Preprint

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In 2004, first absolute gravity (AG) measurements were performed on the mountain tops of Mt. Zugspitze (2 sites) and Mt. Wank (1 site), and at the Wank foot (1 site). Wank (summit height 1780 m) and Zugspitze (2960 m) are about 20 km apart from each other and belong geologically to different parts of the Northern Limestone Alps. Bridging a time span of 15 years, the deduced gravity variations for Zugspitze are in the order of 0.30 μm/s² with a standard uncertainty of 0.04 μm/s². The Wank stations (foot and top) show no significant gravity variation. The vertical stability of Wank summit is also confirmed by results of continuous GNSS recordings. Because an Alpine mountain uplift of 1 or 2 mm/yr cannot explain the obtained gravity decline at Zugspitze, the dominating geophysical contributions are assumed to be due to the diminishing glaciers in the vicinity. The modelled gravity trend caused by glacier retreat between epochs 1999 and 2018 amounts to -0.012 μm/s²/yr at both Zugspitze AG sites. This explains more than half of the observed gravity decrease. Long-term variations on inter-annual and climate-relevant decadal scale will be investigated in the future using as a supplement superconducting gravimetry (installed in 2019) and GNSS equipment (since 2018).

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Simultaneous gravity and gradient measurements from a recoil-compensated absolute gravimeter

Cited by 39 publications

References 7 publications

Stability comparison of two absolute gravimeters: optical versus atomic interferometers

Stability comparison of two absolute gravimeters: optical versus atomic interferometers

Forty-three years of absolute gravity observations of the Fennoscandian postglacial rebound in Finland

Geodetic-Gravimetric Monitoring of Mountain Uplift and Hydrological Variations at Zugspitze and Wank Mountains (Bavarian Alps, Germany)

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