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Digital comparison of x‐ray diffraction data from cotton textiles
Author(s) -
French Alfred D.,
Mitcham Donald,
Rowland Stanley P.
Publication year - 1980
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1980.070250720
Subject(s) - diffraction , scaling , diffractometer , standard deviation , mathematics , equating , materials science , scale (ratio) , optics , analytical chemistry (journal) , statistics , mathematical analysis , algorithm , composite material , physics , geometry , chemistry , chromatography , scanning electron microscope , quantum mechanics , rasch model
It is proposed that step‐scanned digital x‐ray diffraction data from closely similar samples be compared only after averaging several scans. The comparison of averaged data for two samples is shown directly by a running difference curve; more subtle differences are indicated by a running sum of difference curve. In order to compensate for inequalities arising from experimental difficulties, scaling of the two data sets may be optionally accomplished by either equating the total intensity sums or performing a least‐squares fitting. Comparison of the two scale factors and consideration of the intercept (background) and resulting standard deviation provide a quantitative estimate of the difference between samples. The proposed techniques are illustrated for hydrocellulose II, cotton treated with acid, flame retardant, and permanent‐press agent, and for the experimental differences of intact cloth versus pressed pellet and different beam‐current settings on the diffractometer.