The Multi-conjugate Adaptive optics Demonstrator (MAD) has been developed by ESO, and installed at the Nasmyth
focal plane of the Very Large Telescope Melipal at Cerro Paranal in Chile. Thanks to the multi-dimensional sensing and
correction of MAD, the measurements recorded while the system is performing MCAO can be analyzed to retrieve the
instantaneous characteristics of the turbulence seen from the focal plane of the telescope: seeing and turbulence profile.
In this paper those measurements will be compared to the ones given by other tools at disposition at the focal plane: the
guide probe and the active optics sensor, and at another location on the Paranal platform: DIMM and MASS.
Johann Kolb, Johann Kolb,
"Turbulence characterization at the Nasmyth focal plane of the VLT Melipal", Proc. SPIE 7015, Adaptive Optics Systems, 70154O (14 July 2008); doi: 10.1117/12.789457; https://doi.org/10.1117/12.789457