Patent ID: 6791075
Filing Date: 2004-09-14
Classification: G01J,G01N

Abstract:
A method of spectrum analysis in two-dimensional representations of a specific analyzed object, wherein spectral data containing the intensity of the signal output from a spectrophotometer is represented as a function of wave-number, wavelength or time, the n-th and m-th derivatives of spectral data with respect to wave-number, wavelength or time are calculated, where n and m are integers and n does not equal m, points are plotted in a two-dimensional coordinate plane such as in a X-Y coordinate system, where the X-coordinate is the n-th derivative and the Y-coordinate is the m-th derivative; characteristic information on the spectral data is obtained based on the said two-dimensional derivative plot comprising;(A) a step wherein based on the said characteristic information, at least one component band is estimated after the band parameter values regarding at least one component band among the component bands contained in the spectral profile of the analyzed object are estimated, (B) a step wherein the two-dimensional derivative plot with a specific component band removed is obtained by clearing a specific component band or specific component bands already estimated or the two-dimensional derivative plot from th spectral profile or a two-dimensional derivative plot of the analyzed object, (C) a step wherein specific characteristic information based on the two-dimensional derivative plot with this specific component removed is obtained, and band parameter values on remaining component bands are estimated based on the said characteristic information, and (D) a step wherein the already estimated band parameter vales are so adjusted that the already estimated specific component band and the complementary estimation component band with the estimated component band removed coincide with each other, the complementary estimation component band retaining the said estimated specific component band from a spectral profile or two-dimensional derivative plot of the analyzed object; and after estimating the component band which comprises a spectral profile of the analyzed object by estimating component bands in order by iterating steps (A) to (C), adjusting the already estimated parameter values by a step (D).