Telescope e.g. off-Axis telescope, for imaging spectrometer for observation of e.g. marine surfaces from universe, during spatial driving in satellite, has lens and mirror that are arranged so that light passes front side of lens twice

摘要

The telescope has a lens (2) comprising a concave front side (2a) that faces an circular inlet opening (1), and rear side (2b) that is turned away from the inlet opening. The rear side is coated with metal. The inlet opening, lens and a mirror (3) are arranged such that the entered light passes the front side of the lens twice before the entered light hits on the mirror. The lens is designed in a spherical shape or as a strip-shaped lens segment. The mirror is designed as a strip-shaped mirror segment. A calibration unit is provided in the telescope and designed as a diffusion disk.