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The CCD BRANDEIS detector


The Brandeis CCD detector has a raster size of 100 m and 1024 by 1024 pixels. The sensitive area is squared (not circular), and is a bit smaller: circa 95 by 95 mm. If the spindle axis is coming from the right seen from the direction of the direct beam), one should use a film rotation 90.0 in DENZO.

Let be the coordinates x beam y beam of the direct beam position in millimeters on the image plate. If there is no misorientation of the image plate ( cassette rotx roty rotz all equal to zero), the relations between the pixel coordinates written to the new x-file and the STRATEGY laboratory axes are given by:

The display program that is part of the DENZO package, XDISPLAYF, will display the image in the coordinate system with the origin in the upper left corner of the image and the axis vertical. The pixel coordinates one gets when one clicks on an arbitrary position of the image are related to the coordinates according to:

STRATEGY can deal with misorientations of the detector, but does not correct for any radial offset or angular offset.

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