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Proceedings Paper

Radiation effects in two InGaAs focal plane arrays
Author(s): Frederick Knight; Matthew Waldon; Brian Greensmith; Michael Mattei; Lado Tonia; Nicholas Gould
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Paper Abstract

As part of the early development for NASA's Mars Laser Communication Demonstration (now canceled), we exposed two InGaAs focal plane arrays (FPAs) to 22 krad(Si) dose at a rate of 4.6 rad(Si)/s using a 60Co gamma-ray source. Both the SU320MS from Sensors Unlimited and the ISC9809 from FLIR Systems, Inc. operated throughout the test. The FPA electronics were shielded from radiation; only the photosensitive InGaAs and its readout integrated circuit (ROIC) were exposed. Background levels on both FPAs increased during the test. The SU320MS saturated and failed to respond to infrared light after the test. The ISC9809's background increased but did not saturate. Phenomena exhibited during the test included both isolated single-pixel hits and increased mean over the full FPA. Tests of the ISC9809 after irradiation indicate no change in gain but an increase in mean dark current. In addition, 91% of the ISC9809 pixels also had increased temporal noise. As a result of these tests, the ISC9809 was chosen for flight, but shielding was added to reduce the level seen by the FPA to an estimated 6 krad(Si) for a 10-year lifetime in Mars orbit.

Paper Details

Date Published: 17 September 2007
PDF: 6 pages
Proc. SPIE 6690, Focal Plane Arrays for Space Telescopes III, 66900E (17 September 2007); doi: 10.1117/12.730646
Show Author Affiliations
Frederick Knight, MIT Lincoln Lab. (United States)
Matthew Waldon, MIT Lincoln Lab. (United States)
Brian Greensmith, MIT Lincoln Lab. (United States)
Michael Mattei, MIT Lincoln Lab. (United States)
Lado Tonia, MIT Lincoln Lab. (United States)
Nicholas Gould, MIT Lincoln Lab. (United States)


Published in SPIE Proceedings Vol. 6690:
Focal Plane Arrays for Space Telescopes III
Thomas J. Grycewicz; Cheryl J. Marshall; Penny G. Warren, Editor(s)

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