par Wang, Kainan 
;Godfroid, Thomas;Robert, Damiens ;Preumont, André
Référence Actuators, 10, 1, page (1-12), 7
Publication Publié, 2021
;Godfroid, Thomas;Robert, Damiens ;Preumont, André Référence Actuators, 10, 1, page (1-12), 7
Publication Publié, 2021
Article révisé par les pairs
| Résumé : | This paper discusses the design and manufacturing of a thin polymer spherical adaptive reflector of diameter D = 200 mm, controlled by an array of 25 independent electrodes arranged in a keystone configuration actuating a thin film of PVDF-TrFE in d31-mode. The 5 µm layer of electrostrictive material is spray-coated. The results of the present study confirm that the active material can be modelled by a unidirectional quadratic model and that excellent properties can be achieved if the material is properly annealed. The experimental influence functions of the control electrodes are determined by a quasi-static harmonic technique; they are in good agreement with the numerical simulations and their better circular symmetry indicates a clear improvement in the manufacturing process, as compared to a previous study. The low order optical modes can be reconstructed by combining the 25 influence functions; a regularization technique is used to alleviate the ill-conditioning of the Jacobian and allow to approximate the optical modes with reasonable voltages. |
