Characterization of spatial and spectral resolution of a rotating prism chromotomographic hyperspectral imager

Randall L. Bostick; Glen P. Perram; Ronald Tuttle

doi:10.1117/12.817782

28 April 2009 Characterization of spatial and spectral resolution of a rotating prism chromotomographic hyperspectral imager

Randall L. Bostick, Glen P. Perram, Ronald Tuttle

Author Affiliations +

Proceedings Volume 7319, Next-Generation Spectroscopic Technologies II; 731903 (2009) https://doi.org/10.1117/12.817782
Event: SPIE Defense, Security, and Sensing, 2009, Orlando, Florida, United States

Abstract

The Air Force Institute of Technology (AFIT) has built a rotating prism chromotomographic hyperspectral imager (CTI) with the goal of extending the technology to exploit spatially extended sources with quickly varying (> 10 Hz) phenomenology, such as bomb detonations and muzzle flashes. This technology collects successive frames of 2-D data dispersed at different angles multiplexing spatial and spectral information which can then be used to reconstruct any arbitrary spectral plane(s). In this paper, the design of the AFIT instrument is described and then tested against a spectral target with near point source spatial characteristics to measure spectral and spatial resolution. It will be shown that, in theory, the spectral and spatial resolution in the 3-D spectral image cube is the nearly the same as a simple prism spectrograph with the same design. However, error in the knowledge of the prism linear dispersion at the detector array as a function of wavelength and projection angle will degrade resolution without further corrections. With minimal correction for error and use of a simple shift-and-add reconstruction algorithm, the CTI is able to produce a spatial resolution of about 2 mm in the object plane (234 μrad IFOV) and is limited by chromatic aberration. A spectral resolution of less than 1nm at shorter wavelengths is shown, limited primarily by prism dispersion.

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Randall L. Bostick, Glen P. Perram, and Ronald Tuttle "Characterization of spatial and spectral resolution of a rotating prism chromotomographic hyperspectral imager", Proc. SPIE 7319, Next-Generation Spectroscopic Technologies II, 731903 (28 April 2009); https://doi.org/10.1117/12.817782

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