Korsch telescope
As Korsch telescope are reflecting telescopes designated by the Cassegrain telescope derived and differ from them by a third active optical element (mirror). The main advantages are a flat image field and less scattered light in the imaging plane. It consists of an ellipsoidal primary mirror , a hyperbolic secondary mirror , an ellipsoidal tertiary mirror and, depending on the form, one or more flat auxiliary mirrors . The great advantages of this optical construction in terms of imaging performance are bought at the expense of the high cost of calculating and manufacturing the aspherical mirrors and the very low adjustment tolerances. In addition, the perforated deflecting mirror required results in an annular image.
The construction is based on a design by the American Dietrich G. Korsch and was patented in 1978.
The most famous Korsch telescope is the planned James Webb Space Telescope . The planned Euclid mission by ESA and the 2 m telescope of the planned SNAP satellite are also based on a Korsch design. In addition, some existing and planned earth observation satellites ( MTG , EnMAP , Persona ) are based on three-mirror constructions based on Korsch with an offset arrangement of the optical axis ( Schiefspiegler ). The company Kodak also offers the telescope as a finished assembly, which is used in a number of earth exploration satellites, such as the Orbview , IKONOS and GeoEye .
Individual evidence
- ^ Robert Frosch, Dietrich Korsch: US4,101,195 patent specification , NASA , priority July 29, 1977
- ↑ M.Lampton et al .: SNAP Telescope ( Memento of the original from March 4, 2016 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. (PDF; 733 kB), 2003
- ↑ Kodak Model 1000 Camera System ( page no longer available , search in web archives ) Info: The link was automatically marked as defective. Please check the link according to the instructions and then remove this notice.
- ↑ Bernd Leitenberger: Civil detailed reconnaissance
