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Spectral encoder

  • US 7,324,196 B2
  • Filed: 04/13/2006
  • Issued: 01/29/2008
  • Est. Priority Date: 04/13/2006
  • Status: Active Grant
First Claim
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1. A spectral encoder for producing spectrally selected images of a radiation field containing multiple spectral components, comprising:

  • an imaging spectrograph that defines a first optical path that produces from the input radiation field a spectrally dispersed image comprising multiple spectral components displaced along a dispersion direction;

    means, comprising a spatial light modulator, for encoding spectral pass bands on the dispersed image using one or more spatial masks;

    the imaging spectrograph further defining a second optical path that reverses the spectral dispersion of the first path and produces a spectrally-encoded polychromatic output image containing spectral components as encoded by the spatial mask;

    wherein the first and second optical paths share a common dispersing element; and

    a detector that records at least one spatial region of the spectrally encoded output image.

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