Detectors and focal plane modules for weather instruments

A. I. D'Souza; E. Robinson; S. Masterjohn; V. Khalap; S. Bhargava; E. Rangel; S. Babu; D. S. Smith

doi:10.1117/12.2229414

26 May 2016 Detectors and focal plane modules for weather instruments

A. I. D'Souza, E. Robinson, S. Masterjohn, V. Khalap, S. Bhargava, E. Rangel, S. Babu, D. S. Smith

Proceedings Volume 9854, Image Sensing Technologies: Materials, Devices, Systems, and Applications III; 98540H (2016) https://doi.org/10.1117/12.2229414
Event: SPIE Commercial + Scientific Sensing and Imaging, 2016, Baltimore, MD, United States

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 (λ_c ~ 5 μm at 98 K), MWIR (λ_c ~ 9 μm at 98 K) and LWIRs (λ_c ~ 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 Hg_1-xCd_xTe 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-Hz^1/2/W at 14.0 μm, 9.6 x 10¹⁰ cm-Hz^1/2/W at 8.0 μm and 3.4 x 10¹¹ cm-Hz^1/2/W at 4.64 μm.

Citation Download Citation

A. I. D'Souza, E. Robinson, S. Masterjohn, V. Khalap, S. Bhargava, E. Rangel, S. Babu, and D. S. Smith "Detectors and focal plane modules for weather instruments", Proc. SPIE 9854, Image Sensing Technologies: Materials, Devices, Systems, and Applications III, 98540H (26 May 2016); https://doi.org/10.1117/12.2229414

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KEYWORDS

Sensors

Long wavelength infrared

Mid-IR

Photodiodes

Quantum efficiency

Short wave infrared radiation

Temperature metrology

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