The signal recorded in absolute ballistic gravimeters and used to track the trajectory of the free-falling corner-cube was recently studied for the first time in full agreement with relativistic effects. The outcome was an original phase-time equation describing the optical interference as a function of initial position, initial speed, dimensions and refractive index of the corner-cube. This offers the unique possibility to check possible systematic errors affecting data collected using the… Expand

We develop a relativistic treatment of interference between light reflected from a falling cube retroreflector in the vertical arm of an interferometer, and light in a reference beam in the… Expand

Although the equation of motion developed in the paper (Ashby 2018 Metrologia 55 1) depends on the parameters of the falling cube, such as the depth and refraction index, the parameters are only… Expand

In the paper by Ashby (2018 Metrologia 55 1–10) the correction due to the time delay of light propagated through the prism retroreflector of absolute gravimeters is discussed. Accordingly, the… Expand

A recent paper (Ashby 2018 Metrologia 55 1) provides a rigorous relativistic treatment of the laser interferometer with a free-falling cube retroreflector. When considering the phase shift due to the… Expand

The design improvements incorporated in a new generation of absolute gravimeters, the FG5, have led to an instrumental uncertainty estimate of 1,1 × 10-8 m s-2 (1,0 μGal).Expand