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19 November 2012 PERSIST: prototype Earth observing system using image slicer mirrors
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The measurement of the atmospheric concentration of greenhouse gases such as carbon dioxide (CO2) requires the simultaneous observation of a number of wavelength channels. Current and planned CO2 missions typically measure three wavebands using a hyperspectral sensor containing three spectrometers fed by an optical relay system to separate the wavelength channels. The use of one spectrometer per wavelength channel is inefficient in terms of number of detectors required and the mass and volume. This paper describes the development of an alternative solution which uses two key technologies to enable a more compact design; an image slicer mirror placed at the focal plane, and a multiple slit spectrometer operating in multiple diffraction orders. Both of these technologies are in common use in advanced astronomical spectrometers on large telescopes. The imager slicer mirror technology, as used on the James Webb Space Telescope instrument MIRI, enables the spectrometer to be illuminated with three input slits, each at a different wavelength. The spectrometer then disperses the light into multiple diffraction orders, via an echelle grating, to simultaneously capture spectra for three wavelength channels.
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
David Lee, J. Barlow, A. Vick, P. Hastings, D. Atkinson, M. Black, S. Wilson, and P. I. Palmer "PERSIST: prototype Earth observing system using image slicer mirrors", Proc. SPIE 8533, Sensors, Systems, and Next-Generation Satellites XVI, 85330T (19 November 2012);

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