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The Multispectral Telescope (MST) is part of a multi-band imaging
system operating in low earth orbit. It utilizes a single
mechanically cooled focal plane with 15 spectral bands covering a
wavelength range from 0.45 µm to 10.7 µm. It has an on-board
calibration system that includes both end-to-end full aperture
and "quick-look" focal plane only calibrators for all spectral
bands. The calibration system consists of a National Institute of
Standards and Technology (NIST) traceable lamp
source for "quick-look" and uses the sun as a stable reference
for end-to-end calibration for the visible and near-infrared
bands. NIST traceable temperature stabilized blackbodies are used
for both types of calibrations for the mid to long wave infrared
bands.
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The MST consists of a Wide-Field-of-View (WFOV), Three-Mirror
Anastigmatic (TMA) imaging telescope. It operates in a pushbroom
scanning mode, covering 1.38° cross-track and 1.82° along track
with an instantaneous field of view from 10 to 40 µrads,
depending on the band. The telescope has a clear aperture of 36
cm and is near diffraction limited in the visible and strictly
diffraction limited from 1.3 µm to 10.7 µm.
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