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A Hewlett‐Packard ScanJet scanner with transparencies adaptor as X‐ray fibre diffraction photograph densitometer
Author(s) -
Iannelli P.
Publication year - 1996
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889896002191
Subject(s) - densitometer , scanner , optics , data acquisition , diffraction , materials science , scattering , pixel , image resolution , prism , resolution (logic) , computer science , physics , artificial intelligence , operating system
Scanners are widely used for easy and fast image acquisition. Spatial resolution ranges from 300 up to 1200 dots per inch (d.p.i.) and, for black‐and‐white acquisition, 256 grey levels (1 byte) are associated with each pixel. These features are potentially adequate for a quantitative acquisition of the two‐dimensional X‐ray diffraction pattern from a fibre sample of polymer recorded by photographic film. An indirect approach was reported by Calos & Kennard [ J. Appl. Cryst. (1991). 24 , 73], who described a system for reading X‐ray powder film. To avoid the problem of the scattering of the film surface in the reflective acquisition mode, they printed the film on photographic paper; thus, the diffuse light scattering was eliminated. In the present note, the use of a scanner system for a quantitative acquisition of films in a direct way is reported.