15 October 2012 Conceptual optical design and system engineering of the CLARREO/RS (reflected solar) instrument suite
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Proceedings Volume 8515, Imaging Spectrometry XVII; 85150N (2012); doi: 10.1117/12.929849
Event: SPIE Optical Engineering + Applications, 2012, San Diego, California, United States
Abstract
The Climate Absolute Radiance and Refractivity Observatory (CLARREO) program objectives are recommended by the NRC as a Tier-1 mission in its January 15, 2007 Earth Science Decadal Survey to be the key component of a future decade-scale, global climate change observing system. The purpose of CLARREO is to make SI-traceable absolute observations sensitive to the most critical, but least understood climate forcing phenomena, responses, and feedbacks. NASA / LaRC is the mission lead as well as the Infrared (IR) instrument suite development lead. The Reflected Solar (RS) instrument lead center has been assigned to GSFC where engineering risk reduction and science calibration demonstration studies are being conducted on flight-like ETUs in anticipation of entry into Phase A. The RS instrument suite (SOLARIS) is composed of multiple all-aluminum, slit-based, push-broom imaging spectroradiometers of nearly identical construction. Each 'box' will be optimized to provide better than 8nm spectral resolution (using multiple detector elements) over a specific spectral band covering the 320-2300nm total range with significant overlaps to aid calibration. Optical design, fabrication, and alignment will provide for 500m nadir resolutions over a full slit field of 100km from an approximately 600km polar orbit greater than 90% of the time. SNRs are likewise required to exceed 33 for λ < 900nm and 25 for λ < 900nm. The maximum radiometric sensitivity to any naturally-occurring polarized scene elements is expected to be between 0.5% - 0.75% for λ < 1000nm and λ <1000nm respectively. The RS suite system will be capable of demonstrating a long-term, spectrally- & spatially-averaged, systematic radiometric error of less than 0.3% (k=2). Coupled with measurements from on-board GPS radio occultation receivers and inherent inter-calibration compatibility with existing and future Earth science and operational missions, these measurements will provide a long-term benchmarking data record for the detection, projection, and attribution of changes to our planet's climate system. The CLARREO Project team successfully completed its Mission Concept Review (MCR) on November 17, 2010 at LaRC with high marks and remains dedicated to the mission and its instruments. However, the launch readiness date (LRD) is yet to be determined pending budget directive updates from the White House along with review of the IR and RS calibration demonstration efforts (extended pre-Phase A).
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Patrick L. Thompson, Peter C. Hill, "Conceptual optical design and system engineering of the CLARREO/RS (reflected solar) instrument suite", Proc. SPIE 8515, Imaging Spectrometry XVII, 85150N (15 October 2012); doi: 10.1117/12.929849; https://doi.org/10.1117/12.929849
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Remote sensing

Optical design

Mirrors

Sensors

Spectroscopy

Calibration

Lead

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