Optical design layout of the ART showing the ZnSe lenses and the temperature-stabilized compartment holding the tilted-field stop, aperture stop, lenses, and detectors. The entire assembly to the right of the chopper wheel which is about 30 cm in length is temperature stabilized at a common temperature of 23°C. The separation distance from the objective lens to the pyroelectric detector is about 550mm. The outer case of the ART is not temperature stabilized. |
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