| 摘要 |
A semi-active focus and thermal compensation system (20) and improved three mirror anastigmat telescope (10). The telescope has a primary mirror (12), a secondary mirror (13) suspended between the input window and the primary mirror by support struts (14), a tertiary mirror (16), and optional fold mirror (15). The system includes a plurality of heating elements (22) respectively disposed on each of the support struts. A first temperature sensor (23) disposed on the secondary mirror, a second temperature sensor (24) (disposed on the primary mirror) generates a reference temperature, and a plurality of third temperature sensors (25) are disposed on each of the support struts. A temperature compensation controller (21) is coupled to the heating elements and temperature sensors and controls the heat output of the plurality of heating elements to heat the support struts and control the position of the secondary mirror.
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