Piezoelectric active spherical shell reflector for space

This paper is a follow-up to the paper presented at the previous conference, Actuator 2018. It aims at developing ultra-light (areal density: 40-200 g/m2), foldable space reflectors that could be used in space telescopes (for imaging purpos-es), satellite-based LiDAR receiver and space antenna. The project discusses the main achievements over the past two years: The demonstrator consists of a spherical shell of diameter 200 mm and a radius of curvature RC = 2.5 m (instead of a flat plate of diameter 100 mm). The substrate consists of a passive layer of PET (thickness 175 μm) which has been preferred to PEEK for better surface quality, covered with an active layer of PVDF-TrFE of 5 μm. Two ways of application of copolymer have been investigated: spin-coating and spray-coating, and the material parameters of PVDF-TrFE are identified with various methods. Finally, the control authority of the mirror demonstrator is tested by a dynamic metrological system based on Laser Doppler Vibrometry (LDV) technique.SCOPUS: cp.pDecretOANoAutActif