Abstract
The absolute measurement of g is currently realized through the laser interferometric measurement of a free falling retro-reflector. The Micro-g LaCoste FG5X is a free-fall gravimeter with a laser interferometer in Mach-Zehnder configuration which uses simultaneous time and distance measurements to calculate the absolute value of g. Because the instrument itself contains the necessary working standards for precise time and length measurements, it is considered independent of external references. The timing is kept with a 10 MHz rubidium oscillator with a stability of \(5 \times 10^{-10}\). The length unit is realized by the laser interferometer. The frequency calibrated and iodine stabilized helium-neon laser has a wavelength of 633 nm and an accuracy of \(2.5 \times 10^{-11}\).
In 2012 the FG5-220 of the Institut für Erdmessung (IfE) was upgraded to the FG5X-220. The upgrade included a new dropping chamber with a longer free fall and new electronics including a new rubidium oscillator. The metrological traceability to measurement units of the Système International d’unités (SI unit) is ensured by two complementary and successive approaches: the comparison of frequencies with standards of higher order and the comparison of the measured g to a reference measured by absolute gravimeters defined as primary standards within the SI. A number of experiments to test the rubidium oscillator were performed. The oscillator showed a linear drift of \(0.2 \times 10^{-3}\,\mathrm{Hz}\) per month (= \(0.3\,\mathrm{nm}\,\mathrm{s}^{-2}\) per month) in the first 18 months of use. A jump in the frequency of 0.01 Hz (= \(20\,\mathrm{nm}\,\mathrm{s}^{-2}\)) was revealed recently and the drift rate changed to \(-0.4 \times 10^{-3}\,\mathrm{Hz}\)/month.
Since the upgrade of the absolute gravimeter the instrument participated in several international comparisons, which showed no significant measuring offset between the instrument prior and after the upgrade.
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Notes
- 1.
This is the reference height above floor level in which the vertical gravity gradient does not affect the derived g-result.
- 2.
The FG5-220 featured a Datum LPRO rubidium oscillator and the FG5X-220 a Microsemi (formerly Symmetricon) SA.22c rubidium oscillator. Both oscillators are comparable in stability and drift to the original Efratom FRK-L.
- 3.
Meinberg GPS-receiver Rubidium Portable (GRP) frequency reference.
- 4.
FG5(X)-220 refers to the original FG5-220 and the upgraded version.
- 5.
Comité International des Poids et Mesures Mutual Recognition Arrangement, a framework ensuring the comparability of national metrology services.
- 6.
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This work was in part funded by the German Research Foundation (DFG, MU 1141/16-1).
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Schilling, M., Timmen, L. (2016). Traceability of the Hannover FG5X-220 to the SI Units. In: Freymueller, J.T., Sánchez, L. (eds) International Symposium on Earth and Environmental Sciences for Future Generations. International Association of Geodesy Symposia, vol 147. Springer, Cham. https://doi.org/10.1007/1345_2016_226
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DOI: https://doi.org/10.1007/1345_2016_226
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