Share Email Print

Proceedings Paper

Detectors and focal plane modules for weather instruments
Author(s): A. I. D'Souza; E. Robinson; S. Masterjohn; V. Khalap; S. Bhargava; E. Rangel; S. Babu; D. S. Smith
Format Member Price Non-Member Price
PDF $17.00 $21.00

Paper Abstract

Weather satellite instruments require detectors with a variety of wavelengths ranging from the visible to VLWIR. The Cross-track infrared Sounder (CrIS) is a Polar Orbiting interferometric sensor that measures earth radiances at high spectral resolution, using the data to provide pressure, temperature and moisture profiles of the atmosphere. The pressure, temperature and moisture sounding data are used in weather prediction models that track storms, predict levels of precipitation etc. The CrIS instrument contains SWIR (λc ~ 5 μm at 98 K), MWIR (λc ~ 9 μm at 98 K) and LWIRs (λc ~ 15.4 μm at 81 K) bands in three Focal Plane Array Assemblies (FPAAs).

CrIS detectors are 850 μm diameter detectors with each FPAA consisting of nine photovoltaic detectors arranged in a 3 x 3 pattern. Molecular beam epitaxy (MBE)-grown Hg1-xCdxTe material are used for the detectors fabricated in a modified Double Layer Planar Heterostructure (DLPH) architecture. Each detector has an accompanying cold preamplifier. SWIR and MWIR FPAAs operate at 98 K and the LWIR FPAA at 81 K, permitting the use of passive radiators to cool the detectors. D* requirements at peak 14.01 μm wavelength are ≥ 5.0E+10 Jones for LWIR, ≥ 7.5E+10 Jones at 8.26 μm for MWIR and ≥ 3.0E+11 Jones at peak 4.64 μm wavelength for SWIR. All FPAAs exceeded the D* requirements. Measured mean values for the nine photodiodes in each of the LWIR, MWIR and SWIR FPAAs are D* = 5.3 x 1010 cm-Hz1/2/W at 14.0 μm, 9.6 x 1010 cm-Hz1/2/W at 8.0 μm and 3.4 x 1011 cm-Hz1/2/W at 4.64 μm.

Paper Details

Date Published: 26 May 2016
PDF: 11 pages
Proc. SPIE 9854, Image Sensing Technologies: Materials, Devices, Systems, and Applications III, 98540H (26 May 2016); doi: 10.1117/12.2229414
Show Author Affiliations
A. I. D'Souza, DRS Advanced ISR (United States)
E. Robinson, DRS Advanced ISR (United States)
S. Masterjohn, DRS Advanced ISR (United States)
V. Khalap, DRS Advanced ISR (United States)
S. Bhargava, Teledyne Imaging Sensors (United States)
E. Rangel, Teledyne Imaging Sensors (United States)
S. Babu, NASA Goddard Space Flight Ctr. (United States)
D. S. Smith, Harris Corp. (United States)

Published in SPIE Proceedings Vol. 9854:
Image Sensing Technologies: Materials, Devices, Systems, and Applications III
Nibir K. Dhar; Achyut K. Dutta, Editor(s)

© SPIE. Terms of Use
Back to Top