STANDOFF DETECTION FOR NITRIC ACID
First Claim
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1. A method comprising:
- obtaining at least one measurement of a sample, wherein the at least one measurement is obtained from at least one range within a spectral domain;
computing at least one feature signature of the sample in the spectral domain;
classifying the at least one computed feature signature using at least one known chemical signature, wherein the known chemical signature comprises at least one characteristic of a known chemical in the spectral domain; and
determining if the at least one known chemical is present in the sample using the at least one feature signature derived from the at least one known chemical signature.
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Abstract
In one embodiment, a method is disclosed that includes obtaining at least one measurement in a spectral domain of a sample and computing one or more measurements of the salient features in the spectral domain. The salient features correspond to at least one peak within the spectral domain. This method also includes classifying the computed salient features against a feature signature of nitric acid. In addition, this method includes determining if the chemical is present in the sample.
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20 Claims
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1. A method comprising:
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obtaining at least one measurement of a sample, wherein the at least one measurement is obtained from at least one range within a spectral domain; computing at least one feature signature of the sample in the spectral domain; classifying the at least one computed feature signature using at least one known chemical signature, wherein the known chemical signature comprises at least one characteristic of a known chemical in the spectral domain; and determining if the at least one known chemical is present in the sample using the at least one feature signature derived from the at least one known chemical signature. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A system for detecting a chemical, comprising:
a processor for preprocessing an interferogram from a received scene spectral information, wherein the processor in configured to; extract one or more salient features from the preprocessed interferogram corresponding to one or more predefined feature templates representative of one or more chemical vapor clouds; and classify the features to determine if a chemical is present. - View Dependent Claims (14, 15, 16)
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17. A computer readable medium having instructions for causing a processor to perform a method detecting chemicals, the method comprising:
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receiving an interferogram from a sensed spectral information; performing apodization on the interferogram; performing a chirp Fast Fourier Transform on the apodized interferogram; applying a calibration curve; and matching the corrected spectrum to selected chemical signatures of a chemical compound. - View Dependent Claims (18, 19, 20)
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Specification