ADVANCED PATTERN RECOGNITION SYSTEMS FOR SPECTRAL ANALYSIS
First Claim
1. A process of smoothing, resampling, and adaptive curve fitting to each peak initially indicated by some simpler curve fitting operation such as convolution of a spectrum with a peaked function such as a Gaussian or Lorentzian.
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Accused Products
Abstract
A process of rapid and highly accurate analysis of spectral data, includes both a linear scanning (LINSCAN) method and an advanced peak detection method for pattern recognition. One or both of the methods are used to support the detection and identification of chemical, biological, radiation, nuclear and explosive materials. The spectra of various targets can be analyzed by the two spectral analysis methods. These two methods can be combined for dual confirmation, greater accuracy, and to reduced false positives and false negatives, relative to what can be accomplished by either alone.
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Citations
29 Claims
- 1. A process of smoothing, resampling, and adaptive curve fitting to each peak initially indicated by some simpler curve fitting operation such as convolution of a spectrum with a peaked function such as a Gaussian or Lorentzian.
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8. A computer readable medium including software instructions for an information processing system, the software instructions comprising:
a sequence of software operations designed to identify and quantify the intensity of various isotopes contributing to an observed energy spectrum, where the sequence includes;
a preprocessing step that removes noise and minimizes the effects of Compton scattering;
followed by a fit of a resulting spectrum-derived signal as a linear sum of contributions from a prescribed set of isotopes and expected noise spectra; and
followed by an analysis of weights determined by a fit to determine whether an isotope should be reported and whether there may be need for one more stage in which effects from very high radiation levels are reduced and mistakes that nonlinearity can cause are mitigated. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. An information processing system including computer readable medium containing computer instructions comprising instructions for:
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(a) a process of smoothing, resampling, and adaptive curve fitting to each peak initially indicated by some simpler curve fitting operation such as convolution of a spectrum with a peaked function such as a Gaussian or Lorentzian; and
(b) a sequence of software operations designed to identify and quantify the intensity of various isotopes contributing to an observed energy spectrum, where the sequence includes;
a preprocessing step that removes noise and minimizes the effects of Compton scattering;
followed by a fit of a resulting spectrum-derived signal as a linear sum of contributions from a prescribed set of isotopes and expected noise spectra; and
followed by an analysis of weights determined by a fit to determine whether an isotope should be reported and whether there may be need for one more stage in which effects from very high radiation levels are reduced and mistakes that nonlinearity can cause are mitigated, and wherein both (a) and (b) are used as a dual confirmation method to enable greater accuracy. - View Dependent Claims (29)
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Specification