AGAPITO, GUIDOGUIDOAGAPITOARCIDIACONO, CARMELOCARMELOARCIDIACONOESPOSITO, SimoneSimoneESPOSITO2020-09-082020-09-082017http://hdl.handle.net/20.500.12386/27196In typical adaptive optics applications, the atmospheric residual turbulence affects the wavefront sensor response decreasing its sensitivity. On the other hand, wavefront sensors are generally calibrated in diffraction limited condition, and, so, the interaction matrix sensitivity may differ from the closed loop one. The ratio between the two sensitivities, that we will call the sensitivity loss factor, has to be estimated to retrieve a well-calibrated measurement. The spots size measurement could give a good estimation, but it is limited to systems with spots well sampled and uniform across the pupil. We present an algorithm to estimate the sensitivity loss factor from closed loop data, based on the known parameters of the closed loop transfer functions. Here we preferred for simplicity the Shack-Hartmann WFS, but the algorithm we propose can be extended to other WFSs.ELETTRONICOenConference paper10.26698/AO4ELT5.00522-s2.0-85049220023http://arxiv.org/abs/1807.04586v1http://research.iac.es/congreso/AO4ELT5/pages/proceeding0052.html2017aoel.confE...1AFIS/05 - ASTRONOMIA E ASTROFISICAERC sectors::Physical Sciences and Engineering::PE9 Universe sciences: astro-physics/chemistry/biology; solar systems; stellar, galactic and extragalactic astronomy, planetary systems, cosmology, space science, instrumentation::PE9_17 Instrumentation – telescopes, detectors and techniques