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27 August 2008 QWEST: Quantum Well Infrared Earth Science Testbed
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Abstract
Preliminary results are presented for an ultra compact long-wave infrared slit spectrometer based on the Dyson concentric design. The spectrometer has been integrated in a dewar environment with a quantum well infrared photodetecor (QWIP), concave electron beam fabricated diffraction grating and ultra precision slit. The entire system is cooled to cryogenic temperatures to maximize signal to noise ratio performance, hence eliminating thermal signal from transmissive elements and internal stray light. All of this is done while maintaining QWIP thermal control. A general description is given of the spectrometer, alignment technique and predicated performance. The spectrometer has been designed for optimal performance with respect to smile and keystone distortion. A spectral calibration is performed with NIST traceable targets. A 2-point non-uniformity correction is performed with a precision blackbody source to provide radiometric accuracy. Preliminary laboratory results show excellent agreement with modeled noise equivalent delta temperature and detector linearity over a broad temperature range.
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
William R. Johnson, Simon J. Hook, Pantazis Z. Mouroulis, Daniel W. Wilson, Sarath D. Gunapala, Cory J. Hill, Jason M. Mumolo, and Bjorn T. Eng "QWEST: Quantum Well Infrared Earth Science Testbed", Proc. SPIE 7086, Imaging Spectrometry XIII, 708606 (27 August 2008); https://doi.org/10.1117/12.802225
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