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Proceedings Article

Nonscanning no-moving-parts imaging spectrometer

[+] Author Affiliations
Michael R. Descour, Eustace L. Dereniak

Optical Sciences Ctr./Univ. of Arizona (USA)

Proc. SPIE 2480, Imaging Spectrometry, 48 (June 12, 1995); doi:10.1117/12.210908
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From Conference Volume 2480

  • Imaging Spectrometry
  • Michael R. Descour; Jonathan M. Mooney; David L. Perry; Luanna R. Illing
  • Orlando, FL, United States | April 17, 1995

abstract

A temporally and spatially nonscanning imaging spectrometer is described in terms of computed-tomography concepts, specifically the central-slice theorem. The critical system element is a sequence of three transmission sinusoidal-phase gratings rotated in 60 degree increments which achieve dispersion in multiple directions and into multiple orders. The dispersed images of the system's field-stop are interpreted as 2D projections of a 3D (x, y, (lambda) ) object cube. Due to finite focal-plane array size, this computed-tomography imaging spectrometer (CTIS) is an example of a limited-view-angle tomographic system. The imaging spectrometer's point-spread-function is measured experimentally as a function of wavelength and position in the field-of-view. Reconstruction of the object cube is then achieved via the maximum-likelihood expectation-maximization algorithm under the assumption of a Poisson likelihood law. Experimental results using a spatial/spectral 'University of Arizona' target indicate that the instrument performs well in the case of broadband and narrowband emitters. A relationship between an object's spatial size and spectral resolution characteristic of limited-view-angle systems is demonstrated.

© (1995) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Michael R. Descour and Eustace L. Dereniak
"Nonscanning no-moving-parts imaging spectrometer", Proc. SPIE 2480, Imaging Spectrometry, 48 (June 12, 1995); doi:10.1117/12.210908; http://dx.doi.org/10.1117/12.210908


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