At 07:27 27/04/99 -0400, you wrote:
>We have a Guinier camera from which we would like to get digital data, can
>anybody help us ?
>Any information will be appreciated, suggestion about companies that
>supplies optical densitometers or home made alternatives will also be
>wellcome.
We use Guinier cameras a lot and employ an Agfa desktop scanner with a
transparency adaptor linked to a PC. We bought this some years ago. I
imagine these are pretty cheap these days (you can get scaners as good for
well under $100 now). NIH image provides a useful (and free) method for
converting the image into an intensity vs. 2-theta file.
Take a look at the paper:
"Digital analysis of X-ray films"
by D.C.Palmer, MINERALOGICAL MAGAZINE, 1997, Vol.61, No.3, pp.453-461
Abstract: High-resolution intensity profiles can be generated from X-ray
diffraction films using a desk-top scanner and computer image
analysis. The resulting intensity profiles have spatial resolutions
equal to, or exceeding that of modern powder diffractometers - at a
fraction of the cost. This technique provides an economical way of
preserving the information stored in libraries of old (and
deteriorating) powder diffraction films. The same technique can also
be extended to permit quantitative analysis of single-crystal
diffraction films.
Simon Redfern
Dept Earth Sciences
University of Cambridge
Downing Street
Cambridge
CB2 3EQ
UK
