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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°.
|The telescope optics are composed of three principal parts
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.
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.