A low noise laser system for atom interferometry is realized with phase-locked fiber lasers, where the performance of OPLL greatly enhanced by FEOM feedback loop and narrow linewidths. The demonstrated contribute 2.2 mrad per shot to interferometer permit continuous long-term operation more than 115 hours without relocking in field test. Also, mobile gravimeter equipped this reaches a sensitivi...

A Bose-Einstein condensate (BEC) is frequently described as the matter-wave analog of an optical laser – the preferred source for optical interferometry. In this project, we have demonstrated an atom interferometer-based gravimeter using a Rb Bose-condensed source [1]. Our data represent the highest fringe visibility yet achieved in such a device (Fig. 1), for both standard, and large-momentum-...

Abstract. We analyze VLBI delays back to 1984 from the permanent geodetic network, and ten superconducting gravimeter records from the Global Geodynamic Project spanning more than 7 years. From the former data, we deduce nutation offsets, and from the latter we get gravimetric factors. Comparison of these observed quantities against theoretical expressions of the core and mantle admittance to t...

We report on a precision measurement of gravitational acceleration using ultracold strontium atoms confined in an amplitude-modulated vertical optical lattice. An uncertainty Δg/g ≈ 10(-7) is reached by measuring at the 5th harmonic of the Bloch frequency. The value obtained with this microscopic quantum system is consistent with the one measured with a classical gravimeter. Using lattice modul...

We describe development of a transportable version of the Superconducting Gravimeter (SG) and its test in a field experiment to monitor storage in a karst (limestone) aquifer in central Texas. The SG is contained within two aluminum enclosures, one holding the SG in its 35 liter helium dewar, plus electronics; and the second for refrigerator and power supply. In the field test, the SG was suppo...

Deep mining of coal deposits in Upper Silesia Coal Basin Poland over several hundred years has led to disturbances the natural state equilibrium. As a result changes stress distribution, mass distribution (changes gravity forces) and deformation rock mass, seismic tremors with energy reaching up 10E+09J are generated. In this paper, time occurrence is linked gravitational load caused by litosph...