Study on the precision of the MASS turbulence profiler employed in the site testing campaign for the Thirty Meter Telescope

The Multi Aperture Scintillation Sensor (MASS) has become a widely employed device to measure the altitude distribution of atmospheric turbulence. An empirical study is reported which investigates the dependence of the MASS results on the knowledge of the instrumental parameters. Also the results of a side by side comparison of two MASS instruments are presented, indicating that MASS instruments permit measurements of the integrated seeing to a precision better than 0. 05 and of the individual turbulence layer strength C n(h)dh to better than 10 −14 m. c © 2008 Optical Society of America