Suppressions of vibration in the Tip-Tilt mirror control system by add-on controller

Compensation Techniques Aimed at Mitigating Vibrations in Optical Ground-Based Telescopes: A Systematic Review

“…The details of the general characteristics of the different studies are summarized in Table 1 . The included studies took place in three countries: three studies took place in Germany [ 20 , 34 , 35 ], four in China [ 32 , 36 , 37 , 38 ] and one in Italy [ 39 ]. The study of Muradore et al [ 40 ] was an Italian–German cooperation.…”

“…Muradore et al [ 40 ] tested their algorithm at the ESO-VLT. The systems presented by Niu et al [ 37 ] and Tang et al [ 32 , 36 , 38 ] refer in general to optical telescopes with AO control.…”

“…(c) Sensing technology. Six of the studies [ 32 , 36 , 37 , 38 , 39 , 40 ] use image sensors. Of these, Agapito et al [ 39 ] uses a pyramidal WFS, while Muradore et al [ 40 ] uses a WFS.…”

“…(d) Study goals. Vibration reduction in the tip–tilt–mirror modes (tip–tilt–piston mirror) is the focus of most studies [ 32 , 34 , 36 , 37 , 38 , 39 , 40 ], since these modes quantify the image displacements in two orthogonal directions [ 39 ]. Böhm’s studies [ 20 , 35 ] were focused on the compensation of piston aberrations by minimizing the OPD.…”

Finite-Time Control for Piezoelectric Actuators With a High-Order Terminal Sliding Mode Enhanced Hysteresis Observer

“…P IEZOELECTRIC actuators (PZTs) have become one of the key components in various precision engineering applications, such as atomic force microscopy [1], tilting mirrors [2], biological micromanipulation [3], and highprecision manufacturing machines [4]. The reason lies in the fact that PZT provides the advantage of ultrahigh resolution, high stiffness, rapid response, and large output force [5].…”