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DRAFT DICTIONARY CBF/imgCIF Extensions Dictionary |
Draft version 1.5 for comment |
Description:
Data items in the DIFFRN_DETECTOR_ELEMENT category record
the details about spatial layout and other characteristics
of each element of a detector which may have multiple elements.
In most cases, giving more detailed information
in ARRAY_STRUCTURE_LIST and ARRAY_STRUCTURE_LIST_AXIS
is preferable to simply providing the centre of the
detector element.
Example:
Example 1 - Detector d1 is composed of four CCD detector elements,
each 200 mm by 200 mm, arranged in a square, in the pattern
1 2
*
3 4
Note that the beam centre is slightly displaced from each of the
detector elements, just beyond the lower right corner of 1,
the lower left corner of 2, the upper right corner of 3 and
the upper left corner of 4. For each element, the detector
face coordiate system, is assumed to have the fast axis
running from left to right and the slow axis running from
top to bottom with the origin at the top left corner.
loop_
_diffrn_detector_element.detector_id
_diffrn_detector_element.id
_diffrn_detector_element.reference_center_fast
_diffrn_detector_element.reference_center_slow
_diffrn_detector_element.reference_center_units
d1 d1_ccd_1 201.5 201.5 mm
d1 d1_ccd_2 -1.8 201.5 mm
d1 d1_ccd_3 201.6 -1.4 mm
d1 d1_ccd_4 -1.7 -1.5 mm
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Mandatory category: no
Copyright © 2005 International Union of Crystallography