Knowledge based spectrometer
First Claim
1. A method for remotely determining a presence of a particular substance based on spectral data of the particular substance obtained by a spectrometer comprising an interferometer, the method comprising:
- using the interferometer to form an interference pattern resulting from an interaction of radiation with the particular substance;
sampling, at the interferometer, the interference pattern to generate a plurality of measured samples having a measured sample spacing associated therewith;
reading reference spectral data from a spectral reference database;
using cosine estimation at the measured sample spacing for determining amplitudes associated with frequencies uniquely associated with features of spectral data in the plurality of measured samples;
modifying the reference spectral data by selecting a plurality of band centers for the reference spectral data;
comparing the modified reference spectral data with the determined spectral data from the cosine estimation; and
determining a presence of the particular substance based on results of the comparing.
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Accused Products
Abstract
A sensor and method for remotely determining a presence of a particular substance based on spectral data of the particular substance is disclosed. The sensor includes a sampling module configured to detect radiation from a particular substance using an interferometer, wherein the sampling module includes a control module that is configured to guide and measure spacing of samples taken by the sampling module; a focal plane module configured to detect and convert an interference pattern produced by the interferometer into a series of digital samples; a reference spectra modification module configured to modify reference spectra by modifying according to the measured spacing of samples and an instrument line shape of the sampling module; an estimation module configured to receive the converted series of digital samples and transform the non-uniformly spaced digital samples into frequency space using band centers determined from reference spectra as modified by the instrument line shape of the sampling module; a comparison module configured to compare the transformed digital samples against a database of known chemical signatures; and a determination module configured to determine the presence of the particular substance based on the results of the comparison.
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Citations
13 Claims
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1. A method for remotely determining a presence of a particular substance based on spectral data of the particular substance obtained by a spectrometer comprising an interferometer, the method comprising:
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using the interferometer to form an interference pattern resulting from an interaction of radiation with the particular substance; sampling, at the interferometer, the interference pattern to generate a plurality of measured samples having a measured sample spacing associated therewith; reading reference spectral data from a spectral reference database; using cosine estimation at the measured sample spacing for determining amplitudes associated with frequencies uniquely associated with features of spectral data in the plurality of measured samples; modifying the reference spectral data by selecting a plurality of band centers for the reference spectral data; comparing the modified reference spectral data with the determined spectral data from the cosine estimation; and determining a presence of the particular substance based on results of the comparing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification