Clementine Long-Wavelength Infrared Camera (LWIR)

The LWIR camera uses a catadioptric lens with a 128 x 128 mercury cadmium telluride (HCT) FPA. The FPA was mechanically cooled to cryogenic temperatures during operation with a temperature set point goal of 65 K. The optics design incorporates an internal relay with 100% cold shield efficiency. Wavelength ranges was controlled by the cold filter to 8.0 to 9.5 microns.

Camera electronic design is virtually identical to the NIR camera, with a minor alteration in line readout to compensate for the difference in column count between the two arrays (256 for the NIR, 128 for the LWIR). The NIR and LWIR cameras also share a common cryocooler and dewar design, with minor modifications made to accommodate cold shield and cold filter differences.