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Proceedings Paper

SAGE III alternative detector design and characterization
Author(s): Gary E. Halama; James A. McAdoo; Murzy D. Jhabvala; Audrey J. Ewin; Marilyn K. Fortin; Richard A. Bredthauer; M. Nurul Abedin
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Paper Abstract

The Stratospheric Aerosol and Gas Experiment (SAGE) III requires a detector that provides spectral coverage from 280 - 1050 nm. In order to achieve higher responsivity at the ultra-violet wavelengths a backside-thinned silicon CCD technology was chosen. For strength, the backside-thinned detector was bonded to a soda glass substrate. The device thinness allowed the long near infrared wavelengths to pass through the silicon, scatter off the soda glass, and cause cross talk into nearby pixels. Reflections from the soda glass caused etalon-like effects and gave the thinned CCD a highly temperature dependent response. These difficulties led the project manager to examine different options for a replacement detector. Photodiode/CCD technology based on the Moderate- Resolution Imaging Spectrometer-Tilt (MODIS-T) and Gas and Aerosol Monitoring Sensorcraft (GAMS) detectors systems was combined and used to design and fabricate a backup detector for the SAGE III program. The device design and characterization are presented. The design focused on elimination of the scattering due to the soda glass and the temperature dependent etalon effect, increasing charge storage capacity. The detector was designed to allow a retrofit with the existing SAGE III spectrometer. The primary disadvantage of the new detector is its loss of responsivity at the shorter wavelengths.

Paper Details

Date Published: 20 October 1999
PDF: 18 pages
Proc. SPIE 3756, Optical Spectroscopic Techniques and Instrumentation for Atmospheric and Space Research III, (20 October 1999); doi: 10.1117/12.366372
Show Author Affiliations
Gary E. Halama, NASA Langley Research Ctr. (United States)
James A. McAdoo, NASA Langley Research Ctr. (United States)
Murzy D. Jhabvala, NASA Goddard Space Flight Ctr. (United States)
Audrey J. Ewin, NASA Goddard Space Flight Ctr. (United States)
Marilyn K. Fortin, NASA Goddard Space Flight Ctr. (United States)
Richard A. Bredthauer, Lockheed Martin Fairchild (United States)
M. Nurul Abedin, Science Applications International Corp. (United States)

Published in SPIE Proceedings Vol. 3756:
Optical Spectroscopic Techniques and Instrumentation for Atmospheric and Space Research III
Allen M. Larar, Editor(s)

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