BACKGROUND CORRECTION IN EMISSION SPECTRA

摘要

A method for deriving a background-corrected portion of a measured optical emission spectrum comprising the steps of identifying two or more background correction points from the portion of the measured emission spectrum; deriving a background correction function fitted to the identified background correction points, and applying the background correction function to the portion of the measured emission spectrum so as to produce a background-corrected portion of the emission spectrum, wherein the background correction points are identified from the measured data points by consideration of the gradients between the measured data points.

主权项

1. A method for deriving a background-corrected portion of a measured emission spectrum comprising the steps of:
identifying two or more background correction points from the portion of the measured emission spectrum; deriving a background correction function fitted to the identified background correction points, and applying the background correction function to the portion of the measured emission spectrum so as to produce a background-corrected portion of the emission spectrum; wherein the portion of measured emission spectrum comprises measured data points which consist of a series of n intensity values In, at discrete wavelengths or values corresponding to wavelength λn, the series extending from a first measured data point to a last measured data point, and the background correction points are identified from the measured data points by the following steps:
(1) identifying a first background correction point as the first measured data point;(2) calculating the gradients Gm of straight lines between the background correction point just identified and each subsequent measured data point in the series;(3) identifying a next background correction point as the measured data point which lies on the straight line which has the minimum gradient of all the calculated gradients Gm;(4) if the background correction point just identified does not lie at the last measured data point, repeat the procedure from step (2) until it does.