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Tuned dynamic eigen spectroscopy systems

  • US 8,928,880 B2
  • Filed: 07/27/2012
  • Issued: 01/06/2015
  • Est. Priority Date: 07/28/2011
  • Status: Active Grant
First Claim
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1. An apparatus for detecting gas concentrations, the apparatus comprising:

  • a coded filter to oscillate at a selected frequency;

    a photo detector positioned below the coded filter such that the coded filter selectively blocks light that is directed at the photo detector;

    optics for projecting spectral information on to the coded filter; and

    a processor for analyzing a signal received from the photo detector, wherein the processoris adapted to weight harmonics of the signal, wherein the slits are positioned to pass at least two AC components of the spectrally separated light corresponding to a gas not of interest such that the AC components cancel out on the photo detector.

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