Transactions Of The Institute Of Measurement And Control, vol.0, no.0, 2020 (SCI-Expanded)
In this paper, the control of a fast steering mirror which is the core
element of an adaptive optics system is investigated to suppress the
beam jitter. The main source of the jitter is taken as the atmospheric
turbulence. The effect of the atmospheric turbulence on the beam
jitter is experimentally determined with respect to the two different
refractive index structure parameters. The mathematical model of
the fast steering mirror based on the atmoshperic turbulence data
is obtained using the system identification. In order to overcome
implementation problems, the low order proportional-integral-derivative
(PID) type controllers which minimizes the
H
∞ norm of the closed loop
system, are designed in the centralized and the decentralized settings.
In addition to this, the fixed order weighted
H
∞ controller is based on
the frequency characteristics of the atmospheric turbulence which is
determined experimentally. Then, in order to show the effectiveness of
the proposed low order PID type controller, the designed controllers
are compared on the experimental setup. Finally, the simulation and
the experimental results are presented. Comparison of advantageous
and disadvantageous of centralized and decentralized controller archi
-
tectures are discussed.