Space telescope has deployed Fresnel lens made of framework stabilised thin film with detector and illuminator in similar orbits

摘要

A space telescope has a rotation (13) or framework stabilised converging Fresnel lens (1) comprising a plastic film with alternate clear and opaque zones and a charge coupled or amplifier detector (3) both in orbit (16) around a the earth or other celestial body (T) and viewing a region illuminated by a monochromatic laser (2).