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1 October 1991 Tilt corrector based on spring-type magnetostrictive actuators
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Abstract
A number of important applications of high precision positioning actuator are related with laser technique and technology, optics, especially with large optical devices for the ground and space based astronomy. These actuators can be used in adaptive optics as the displacement and force actuators to preform in real time a mirror surface, conjugated with the wave front aberration by means of elastic deformation of mirror substratum [1,2]. A spring—type magnetostrictive actuator (STMA) in which Wiedemann effect (WE) [4] is realized, was described in [3] - is one of the interesting types of macro actuators, by means of which it is possible to achieve a precision displacement level 200 Lm with the accuracy of positioning up to 0.1 Lm in a real time scale ( up to 5 ms). Hence, the STMA satisfies all the visible and infrared adaptive optics requirements. A more complete understanding of such approach to actuators creation allows one to establish the main distinguished STMA features [5,6] : 1. High level of STMA relative longitudinal defomatins is controlled by STMA designed parameters and reaches 10 -10 when using ordinary magnetostrictive materials. This level of relative longitudinal deformations is accessible only for best sorts of piezoceramics; 2. A width of STMA magneto mechanical resonant frequencies band (from 10 Hz up to 1 kHz) is controlled by designed STMA parameters; 3. It is possible to use the inverse Wiedemann effect (IWE) for STMA material stresses controlling and, consequently, for closed loop STMA control.
© (1991) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Vladimir I. Aksinin, Victor V. Apollonov, Sergue A. Chetkin, Vadim V. Kijko, Sergue V. Muraviev, and Gleb V. Vdovin "Tilt corrector based on spring-type magnetostrictive actuators", Proc. SPIE 1500, Innovative Optics and Phase Conjugate Optics, (1 October 1991); doi: 10.1117/12.46852; https://doi.org/10.1117/12.46852
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