Orthogonal signal projection

Details Orthogonal signal projection Orthogonal signal projection

2005-02-08

2005-02-08

Hoff, Marc S. (Department: 2857)

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Chemical analysis

C703S012000, C436S008000

Reexamination Certificate

active

06853923

ABSTRACT:
The invention provides a method and an arrangement for filtering or pre-processing most any type of multivariate data exemplified by NIR or NMR spectra measured on samples in order to remove systematic noise such as base-line variation and multiplicative scatter effects. This is accomplished by differentiating the spectra to first or second derivatives, by Multiplicative Signal Correction (MSC), or by similar filtering methods. The pre-processing may, however, also remove information from the spectra, as well as other multiple measurement arrays, regarding (Y) (the response variables). Provided is a variant of PLS that can be used to achieve a signal correction that is as close to orthogonal as possible to a given (y) vector or (Y) matrix. Hence, ensuring that the signal correction removes as little information as possible regarding (Y). A filter according to the present invention is named Orthogonal Partial Least Squares (OPLS).

REFERENCES:
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patent: 6480795 (2002-11-01), Bossart et al.
patent: 6493637 (2002-12-01), Steeg
patent: 6593572 (2003-07-01), Kelley
patent: 0581023 (1994-02-01), None
patent: 9967722 (1999-12-01), None

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