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Proceedings Paper

The Orbiting Carbon Observatory instrument optical design
Author(s): Robert Haring; Randy Pollock; Brian M. Sutin; David Crisp
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Paper Abstract

The Orbiting Carbon Observatory (OCO) will measure the distribution of total column carbon dioxide in the Earth's atmosphere from an Earth-orbiting satellite. Three high-resolution grating spectrometers measure two CO2 bands centered at 1.61 and 2.06 μm and the oxygen A-band centered at 0.76 μm in the near infrared region of the spectrum. This paper presents the optical design and highlights the critical optical requirements flowed down from the scientific requirements. These requirements necessitate a focal ratio of f/1.9, a spectral resolution of 20,000, and precedence-setting requirements for polarization stability and the instrument line shape function. The solution encompasses three grating spectrometers that are patterned after a simple refractive spectrometer approach consisting of an entrance slit, a two-element collimator, a planar reflection grating, and a two-element camera lens. Each spectrometer shares a common field of view through a single all-reflective telescope. The light is then re-collimated and passed through a relay system, separating the three bands before re-imaging the scene onto each of the spectrometer entrance slits using an all-reflective inverse Newtonian re-imager.

Paper Details

Date Published: 14 October 2004
PDF: 12 pages
Proc. SPIE 5523, Current Developments in Lens Design and Optical Engineering V, (14 October 2004); doi: 10.1117/12.562693
Show Author Affiliations
Robert Haring, Hamilton Sundstrand (United States)
Randy Pollock, Hamilton Sundstrand (United States)
Brian M. Sutin, Hamilton Sundstrand (United States)
David Crisp, Jet Propulsion Lab. (United States)

Published in SPIE Proceedings Vol. 5523:
Current Developments in Lens Design and Optical Engineering V
Pantazis Z. Mouroulis; Warren J. Smith; R. Barry Johnson, Editor(s)

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