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Proceedings Paper

SWIR to LWIR HgCdTe detectors and FPAs for remote sensing applications
Author(s): A. I. D'Souza; M. G. Stapelbroek; L. Dawson; P. Ely; C. Yoneyama; J. Reekstin; H.-D. Shih; M. Skokan; T. Teherani; J. Robinson
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Paper Abstract

Remote sensing programs require detectors with a variety of wavelengths. One example of remote sensing applications is the GOES-ABI program that requires linear arrays of detectors with cutoff wavelengths ranging from the visible to the VLWIR (λc ~ 15 μm). In order to target the variety of remote sensing applications, an internal task was conducted to develop detectors and linear arrays operating under nominal remote sensing applications. SWIR [λc(295 K) ~ 2.5 μm] test detectors have been measured as a function of temperature between 170 K and 295 K. At 200 K the RoA values are in the 106 ohm-cm2 range. MWIR [λc(60 K) = 5.3 μm] and LWIR [λc(60 K) = 10.5 μm] HgCdTe detectors in a 320 x 6 array format have also been measured at 60 K. Within the arrays, the detector size is 40 μm x 50 μm. The MWIR detector array has a mean quantum efficiency of 89.2 % with a standard deviation to mean ratio, σ/μ = 1.51 %. The integration time for the focal plane array (FPA) measurements is 1.76 ms with a frame rate of 557.7 Hz. Operability values exceeding 99.5 % have been obtained. In addition, test diodes at the edge of the array that did not go through a read out integrated circuit (ROIC) were also measured and had quantum efficiency ~ 86 % that agreed well with the ~ 87 % quantum efficiency measured for detectors in the array that were located near the test detectors. The LWIR arrays, measured at 60K also had high operability with only ~ 3 % of the detectors having out of family response. Using best detector select (BDS) feature in the read out integrated circuit (ROIC), a feature that picks out the best detector in every row of six detectors, a 320 x 1 array with 100 % operability is obtained. For the 320 x1 array constituted using the BDS feature, a 100 % operable LWIR array with average NEI value of 1.94x1011 ph/cm2/s at a flux of 7.0x1014 ph/cm2/s has been demonstrated.

Paper Details

Date Published: 21 October 2005
PDF: 8 pages
Proc. SPIE 5978, Sensors, Systems, and Next-Generation Satellites IX, 597818 (21 October 2005); doi: 10.1117/12.627752
Show Author Affiliations
A. I. D'Souza, DRS Sensors and Targeting Systems, Inc. (United States)
M. G. Stapelbroek, DRS Sensors and Targeting Systems, Inc. (United States)
L. Dawson, DRS Sensors and Targeting Systems, Inc. (United States)
P. Ely, DRS Sensors and Targeting Systems, Inc. (United States)
C. Yoneyama, DRS Sensors and Targeting Systems, Inc. (United States)
J. Reekstin, DRS Sensors and Targeting Systems, Inc. (United States)
H.-D. Shih, DRS Infrared Technologies (United States)
M. Skokan, DRS Infrared Technologies (United States)
T. Teherani, DRS Infrared Technologies (United States)
J. Robinson, DRS Infrared Technologies (United States)

Published in SPIE Proceedings Vol. 5978:
Sensors, Systems, and Next-Generation Satellites IX
Roland Meynart; Steven P. Neeck; Haruhisa Shimoda, Editor(s)

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