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Proceedings Paper

Design And Performance Of The Stratospheric Aerosol And Gas Experiment II (SAGE II) Instrument
Author(s): N. H. Zaun; L. E. Mauldin III; M. P. McCormick
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Paper Abstract

Design and performance data are presented for the Stratospheric Aerosol and Gas Experi-ment II (SAGE II) instrument, which has been developed for the Earth Radiation Budget Satellite (ERBS). SAGE II is designed to monitor globally the vertical distribution of strato-spheric aerosols, ozone, water vapor and nitrogen dioxide by measuring the extinction of solar radiation through the earth's atmosphere during the ERBS observatory solar occultations. Solar radiation is reflected from a flat scanning mirror into a Cassegrain type telescope, which forms a solar image on the entrance slit of a grating spectrometer. The SAGE II instantaneous-field-of-view (IFOV) is scanned along the vertical solar diameter by the elevation scan mirror. The entire optical system is contained within an azimuth gimbal which tracks the solar radiometric centroid during the data event. This spectrometer, with help from three interference filters, isolates seven spectral wavelengths ranging from 0.385 micrometers to 1.02 micrometers. All seven channels use silicon photodiode detectors oper-ated in the photovoltaic mode. Detector outputs are multiplexed into a serial data stream for readout by the ERBS telemetry system. Each output is sampled 64 times per second and digitized to 12 bit resolution. SAGE II is a third generation instrument following the highly successful SAM II and SAGE programs.

Paper Details

Date Published: 19 January 1984
PDF: 7 pages
Proc. SPIE 0430, Infrared Technology IX, (19 January 1984); doi: 10.1117/12.936376
Show Author Affiliations
N. H. Zaun, Ball Aerospace Systems Division (United States)
L. E. Mauldin III, NASA Langley Research Center (United States)
M. P. McCormick, NASA Langley Research Center (United States)

Published in SPIE Proceedings Vol. 0430:
Infrared Technology IX
Richard A. Mollicone; Irving J. Spiro, Editor(s)

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