Athermalization of Star Tracker System

Based on the compensation theory of thermal dispersion, an actual high-precision athermal star tracker system was designed and evaluated. Optical materials are selected according to the passive athermalizing principle. The system has the following parameters: waveband range 0.5~0.8μm, <em<F</em< number 2, field of view 10°,temperature range -10℃~30℃. The defocus, energy curves and modulation transfer function (MTF) of the lenses are given as examples. It is shown that the athermal optical system can work steadily with high optical quality in the required temperature range.