The assembled diffraction intensity group "/adi"
The raw data .nc files described in Sec. 2.1
contain considerable detail on the experimental settings used
to record a particular exposure. However, the goal in the
experiment is to produce a single, high quality file representing
the processed diffraction data (possibly along with some indication
of the error of various pixels).
The "/adi" group contains both the data, and a structure
adi_struct of related parameters. The elements of this structure
are as follows:
- photon_scaling:
multiply adi_array by this factor to convert
it into photons per pixel. Set to zero if unknown.
- error_scaling:
scaling factor
to apply to error_array.
See 2.2.3.
- lambda_meters:
x-ray wavelength in meters.
- camera_z_meters:
CCD camera distance from sample.
- camera_x_pixelsize_meters:
size of camera pixels in the nx direction,
in meters.
- camera_y_pixelsize_meters:
size of camera pixels in the nx direction,
in meters.
- theta_x_radians:
GMR position
(rotation about the horizontal transverse direction) to
which the sample was set to be at. Obsolete since already defined
in "/ainfo" group?
- theta_y_radians:
orientation
of the specimen about the vertical transverse direction.
Set to zero if unknown. Obsolete since already defined
in "/ainfo" group?
- theta_z_radians:
orientation
of the specimen about the beam axis direction.
Set to zero if unknown. Obsolete since already defined
in "/ainfo" group?
- xcenter_offset_pixels: location of the true
center of the array relative to pixel
.
- ycenter_offset_pixels: location of the true
center of the array relative to pixel
.
Microscope User
2008-04-30