The Ozone Monitoring Instrument OMI [1] was launched on the EOS-Aura mission in 2004. It contains a push broom telescope with a wide field of view, sweeping over the earth surface with global daily coverage. The telescope combines an unsurpassed wide field of view (114°) with high image quality. The two-mirror telescope has a pupil and an intermediate image in between the mirrors, and images an elongated swath on the earth surface on a spectrometer slit, the image being telecentric.
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