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Overview   Instrument
The SABER instrument is a 10-channel infrared (1.27 to 16.9 µm) radiometer that will measure Earth limb emissions from the TIMED (Thermosphere, Ionosphere, Mesosphere Energetics and Dynamics) satellite.

The instrument telescope is a Cassegrain design with a picket-fence tuning fork chopper at the first focus, and a clam shell reimager to focus the image on the focal plane. The telescope has been designed to reject stray light from the Earth and atmosphere outside the instrument instantaneous field-of-view (IFOV). The baffle assembly contains a single axis scan mirror which permits the 2 km vertical IFOV of each detector to be scanned from the Earth to a 400 km tangent height. Accurate vertical registration of the tangent height of the data in the atmosphere is achieved by analysis of the 14.9 µm CO2 channels. The telescope and baffle assembly are cooled to 240 K by a dedicated radiator. The focal plane assembly, consisting of a filter array, a detector array, and a Lyot stop is cooled to 75 K by a miniature cryogenic refrigerator. The detector array contains discrete HgCdTe, InSb, and InGaAs detectors.

  • 1 Instrument +X View
  • 2 Instrument +Z View
  • 3 Instrument +Y View
  • 4 Details
  • 4 Preliminary GSE Layout
  • 4 Cross-Sectional View of GSE Test Chamber
 The conductive heat load on the refrigerator is minimized by a support system that thermally isolates the focal plane assembly from the telescope. The telescope is supported and thermally isolated from the instrument base plate by a glass composite structure. The cryogenic refrigerator and electronics heat loads are dissipated to space by the plate radiator. Instrument responsivity drifts due to changes in telescope and focal plane base temperatures as well as other causes are corrected by an in-flight calibration system.
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SABER arrives at Applied Physics Laboratory

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