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ENCODER SPECTROGRAPH WITH OPTIMIZED DIFFRACTION GRATING

  • US 20070268486A1
  • Filed: 08/03/2007
  • Published: 11/22/2007
  • Est. Priority Date: 06/28/2004
  • Status: Active Grant
First Claim
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1. An encoder spectrograph for detecting one or more spatial components from a source, the spectrograph comprising:

  • first optics adapted to collect and focus radiation from a source to form a dispersed image along an encoding axis, the dispersed image characteristic of the spatial components of the source, wherein the first optics comprise a diffraction grating that is optimized for an annular-shaped intercept between the dispersed image and the radiation filters on a modulator;

    a spatial radiation modulator having at least two radiation filters located at different positions along the encoding axis, the radiation filters configured to modulate the spatial components with different modulation functions to provide an encoded beam comprising at least two encoded spatial components;

    a detector;

    second optics adapted to collect and direct the encoded beam onto the detector, causing the detector to provide an output corresponding to the encoded beam; and

    a processor for analyzing the output from the detector to determine the spatial components modulated in the encoded beam.

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