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Calibration procedures and measurements for the COMPASS hyperspectral imager

2004; SPIE; Linguagem: Inglês

10.1117/12.546758

1996-756X

Jerome A. Zadnik, D. Guérin, Robert J. Moss, Alan Orbeta, Roberta Dixon, Christopher G. Simi, Susannah Dunbar, Anthony B. Hill,

Impact of Light on Environment and Health

The COMPact Airborne Spectral Sensor (COMPASS) hyperspectral imager (HSI) developed at the Army Night Vision and Electronic Sensors Directorate (NVESD) operates in the solar reflective region. The fundamental advance of the COMPASS instrument is the ability to capture 400nm to 2350nm on a single focal plane, eliminating boresighting and co-registration issues characteristic of dual FPA instruments for visible and SWIR regions. This paper presents a calibration procedure for COMPASS including spectral band profiles and radiometric calibration. These procedures expand on successful calibration procedures used for the Night Vision Infrared Spectrometer (NVIS) system. A high-resolution monochromator was used to map the band center and bandwidth profiles across the FPA with an accuracy goal of ±0.5nm using several different illumination configurations. Although optical distortions are below previous measurement capabilities, accurate band profiles provide additional data to map potential distortions within the system. Radiometric calibration was performed with a NIST-traceable flood source. Test results are presented showing a well-behaved system with an average spectral bandwidth of 8.0nm ±0.5nm over the instrument spectral range.