Data processing: measuring – calibrating – or testing – Measurement system – Statistical measurement
Reexamination Certificate
2006-10-24
2006-10-24
Wachsman, Hal D. (Department: 2857)
Data processing: measuring, calibrating, or testing
Measurement system
Statistical measurement
C702S022000, C702S027000, C702S030000
Reexamination Certificate
active
07127372
ABSTRACT:
An improved regression-based qualitative analysis algorithm useful when the mixture to be analyzed contains a compound not in the library spectra, a so-called unknown. A regression of a measured spectrum is computed against the library spectra. This regression is referred to as a “master” regression. Estimated mixing coefficients for an estimated spectrum are computed from the regression. Next, a residual error is computed between the estimated spectrum and the measured spectrum. Peaks in the residual error are identified that extend in a direction opposite to that of peaks in the measured spectrum. These peaks are referred to as “negative” peaks. A regression is performed on the peaks. This is referred to as a “retro-regression” to be distinguished from the master regression performed on the measured spectrum. Using information from the retro-regression, corrected mixing coefficients are computed and the process repeats.
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Edell, Shapiro & Finnnan, LLC
ITT Manufacturing Enterprises Inc.
Wachsman Hal D.
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