Method for determining background and correction of...

Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer

Reexamination Certificate

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Reexamination Certificate

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07876435

ABSTRACT:
A method to determine and correct broadband background in complex spectra in a simple and automatized manner includes carrying out a background correction with respect to broadband background before a calibration step. The background correction may involve recording a spectral graph and smoothing the recorded spectral graph, determining all values in the initially recorded graph having a value higher than the value of the smoothed graph and reducing such values to the value of the smoothed graph, and repeating these two steps. The background graph obtained is then subtracted from the initial graph. The smoothing of the graph is carried out by moving average, where each intensity value I at the position x in the spectrum is replaced by an average value. The characteristics of the found peaks can be stored in a file so that the calibration can be used at any time.

REFERENCES:
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Sonneveld & Visser;Automatic collection of Powder Data from Photographs; Jour. Of Appl. Cryst., (1975) vol. 8, No. 1; pp. 1-7; (XP-002529869).
R.P. Goehner;Background Subtract Subroutine for Data; Analytical Chemistry, vol. 50, No. 8, Jul. 1978; American Chemical Society; p. 1223 (XP-007908639).
Liu & Koenig;A New Baseline Correction Algorithm Using Objective Criteria; Applied Specroscopy, vol. 41, No. 3, 1987; Society for Applied Spectroscopy; pp. 447-449 (XP-007908640).
S. Florek et al.;Adaption of an Eschelle Spectrograph to a large CCD Detector; Frescenius Jour. Of Analytic Chemistry; vol. 355, (1996); p. 269.

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