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Instrument Overview

Antenna Optics
The STEAMR instrument is a multi-beam atmospheric limb sounder that will observe the UT/LS using 14 simultaneously observing beams  in a push-broom geometry with an elevation spread from 6-28 km and separated by in azimuth by 10 km. The 14 receiver channels are divided into two groups of seven beams, separated in polarisation by ± 45°.

STEAMR limb view.

The telescope optics are composed of three principal parts
  • Main telescope—an off-axis Ritchey Chrčtein (M1-M2). This particular optical combination is utilised here as it eliminates coma and provides a larger field field of view over traditional Cassegrain or Gregorian designs, which is ideal for multi-beam observation.
  • Relay reflectors—optics providing required imaging and de-astigmatism for complete beam set (M3-M4-M4-M6). The relay reflectors also provide the required space for the calibration subsystem consisting of an intercepting beam chopper, optics and calibration targets.
  • Focal plane array— the focal plane array comprises two arrays of monolthically machined facet reflectors, one array for each set of seven beams, separated in polarisation with a wire grid polariser, which couple the beams at the farfield image plane to the corresponding feed horns.

Backends
Coming soon...




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