47 lines
2.0 KiB
HTML
47 lines
2.0 KiB
HTML
<HTML>
|
|
<HEAD>
|
|
<TITLE>Powder</TITLE>
|
|
</HEAD>
|
|
<BODY>
|
|
<H1>Powder</H1>
|
|
<P>
|
|
SICS uses NeXus, based on HDF, as its raw dataformat. As first instrument
|
|
DMC is using this new data format. A common task at DMC is to sum and
|
|
concatenate measurements to a complete powder diagram. During this a detector
|
|
efficiency correction needs to be performed. Users may also request an absorption
|
|
correction to be performed. All this has been implemented as a set of
|
|
operations in Tcl. This allows for scripting user interfaces to this process.
|
|
</P>
|
|
<p>
|
|
This package installs one new command <EM>powder</EM> in Tcl. The principle
|
|
operation is that single diagrams are added into a list. Once this list is
|
|
complete the operator finish will do the necessary calculations.
|
|
powder understands the following operators:
|
|
<UL>
|
|
<LI><em>powder mur val</em>. Sets the absorption coefficient to val.
|
|
<LI><em>powder eff filename</em>. Sets the detector efficiency file to
|
|
use for efficiency correction. If none is specified no correction will be
|
|
performed.
|
|
<LI><em>powder add filename</em> Adds a powder diagram in ASCII format from
|
|
filename to the current list.
|
|
<LI><em>powder addnx filename</em>. Adds the powder diagram in NeXus format
|
|
to the current list.
|
|
<LI><em>powder sub filename</em> Adds a powder diagram in ASCII format from
|
|
filename to the current list. All counts are made neagtive in order to achieve
|
|
a subtraction.
|
|
<LI><em>powder subnx filename</em>. Adds the powder diagram in NeXus format
|
|
to the current list.All counts are made neagtive in order to achieve
|
|
a subtraction.
|
|
<LI><em>powder finish</em>. Initiates the actual calculation of the
|
|
concatenated powder diagram.
|
|
<LI><em>powder abs</em>. Performs absorption correction on the current
|
|
powder diagram. A value for mur must have been specified.
|
|
<LI><em>powder write filename</em>. Writes the result powder diagram to
|
|
an ASCII file in DMC format.
|
|
<LI><em>powder clear</em>. Deletes all internal buffers and lists prior to
|
|
a new calculation.
|
|
</UL>
|
|
|
|
</BODY>
|
|
</HTML>
|