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Controlling the Remnant Deformation of a Piezoelectric Actuator Using A Root Finding Algorithm

Mendes, Pedro (2019) Controlling the Remnant Deformation of a Piezoelectric Actuator Using A Root Finding Algorithm. Master's Thesis / Essay, Astronomy.


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As humans, we became a curious species, and one of the biggest targets of that curiosity is the distant Universe around us. One of the questions we started asking ourselves is: are there any other planets like Earth? With the amount of stars in the Milky Way, other star systems like our own Solar System might exist. Recently, technology started to evolve in such a way we can start observing these stellar systems with very powerful telescopes. However, this is still a somewhat "recent" technology, and one of the challenges is to develop reliable deformable mirrors capable of correcting the wavefront that arrives to us from these distance systems. The Netherlands Institute for Space Research recently proposed a new design for a deformable mirror that makes use of the hysteretic nature and properties of a chosen material to increase the performance of these deformable mirrors. This new approach relies on the control of the remnant deformation of such material, to which the corresponding deformation loop might not even be a single hysteretic loop, but a butterfly loop. These loops are modeled using non-linear models, which, together with the shape of the butterfly loop itself, makes the controlling a challenging step to the new design. This thesis will present a new approach for a controlling algorithm for the remnant deformation of these actuators.

Item Type: Thesis (Master's Thesis / Essay)
Supervisor name: Jayawardhana, B.
Degree programme: Astronomy
Thesis type: Master's Thesis / Essay
Language: English
Date Deposited: 28 Oct 2019
Last Modified: 29 Oct 2019 12:56

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