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For sensitive infrared interferometry, it is crucial to control thedifferential piston evolution between the used telescopes. This is classicallydone by the use of a fringe tracker. In this work, we develop a new method toreconstruct the temporal piston variation from the atmosphere, by usingreal-time data from adaptive optics wavefront sensing: the PistonReconstruction Experiment (P-REx). In order to understand the principleperformance of the system in a realistic multilayer atmosphere it is firstextensively tested in simulations. The gained insights are then used to applyP-REx to real data, in order to demonstrate the benefit of using P-REx as anauxiliary system in a real interferometer. All tests show positive results,which encourages further research and eventually a real implementation.Especially the tests on on-sky data showed that the atmosphere is, under decentobserving conditions, sufficiently well structured and stable, in order toapply P-REx. It was possible to conveniently reconstruct the piston evolutionin two-thirds of the datasets from good observing conditions (r$_0$ $\sim$ 30cm). The main conclusion is that applying the piston reconstruction in a realsystem would reduce the piston variation from around 10 $\mu$m down to 1-2$\mu$m over timescales of up to two seconds. This suggests an application formid-infrared interferometry, for example for MATISSE at the VLTI or the LBTI.P-REx therefore provides the possibility to improve interferometricmeasurements without the need for more complex AO systems than already inregular use at 8m-class telescopes.

P-REx: The Piston Reconstruction Experiment for Infrared Interferometry