Design, alignment, and laboratory calibration of the Compact Wide Swath Imaging Spectrometer II (CWIS-II)

The Compact Wide Swath Imaging Spectrometer II (CWIS-II) is an imaging spectrometer built, tested, calibrated, and delivered for the University of Zurich (UZH). CWIS-II will be integrated into an aircraft for Earth science research, algorithm development, and satellite calibration and validation. CWIS-II’s two-mirror telescope and Dyson-type spectrometer are optically fast (F/1.8), span a wide swath (40.2-degree field of view over 1240 spatial pixels), record data at 216 frames per second, and operate over the 380-2500 nm solar-reflected spectrum with 7.4 nm spectral sampling. This work describes the CWIS-II instrument configuration, optical alignment process, and present final laboratory spectral and spatial performance.