The Cross-track Infrared Sounder (CrIS) is one of many instruments that comprise the National Polar-orbiting Operational Environmental Satellite System (NPOESS). The CrIS instrument is a Michelson interferometer-based sensor that is sensitive to wavelengths between 3.5 and 16 microns. Three separate Focal Plane Array Assemblies (FPAAs) referred to as the Short Wave Infrared Assembly, the Mid Wave Infrared assembly, and the Long Wave Infrared assembly are used to span the spectral range. The CrIS instrument measures the earth radiance at high spectral resolution using the data to provide pressure, temperature and moisture profiles of the atmosphere. The CrIS instrument will help improve both global and regional predictions of weather patterns, storm tracks, and precipitation. The CrIS program selected photovoltaic (PV) detectors for use in all three spectral bands. PV technology outperforms photoconductive detectors in terms of high sensitivity and linearity. Each FPAA consists of a 3×3 detector-matrix that are used to form 9 fields of view (FOV). Each detector has a 1,000 mm active area diameter and has its own cold preamplifier, warm post amplifier and independent high pass filter. This paper describes the performance for all three assemblies that together form the basis of the CrIS Engineering Development Unit 2 (EDU2) Detector Preamp Module (DPM).
Molecular Beam Epitaxy (MBE) is used to grow the appropriate bandgap n-type Hg1-xCdxTe on lattice matched CdZnTe. SWIR, MWIR and LWIR 1000 mm diameter detectors have been manufactured using the Lateral Collection Diode (LCD) architecture. Custom pre-amplifiers have been designed to interface with the large SWIR, MWIR and LWIR detectors. The operating temperature is above 78 K, permitting the use of passive radiators in spacecraft to cool the detectors. Recently, all three FPAAs were completed and tested. The tests performed on each assembly are listed.