[Nexus] Detector calibration scaling

Tue Feb 3 15:55:54 GMT 2015

Mark,

Am 03.02.2015 um 15:17 schrieb Mark.Basham at diamond.ac.uk<mailto:Mark.Basham at diamond.ac.uk>:

Dear All,

I have a Beamline which wants to include a scaling factor for their detector to correct it to absolute intensities, based on a calibration.

In NXdata there is a scaling_factor which is good, and what we are currently using, but I can’t find anywhere appropriate to put this calibrated scale value for the intensity in NXdetector which should also contain the information.

There is a countrate_correction__applied Boolean value, but that’s for hardware corrections only, with flatfield_applied, angular_calibration_applied and pixel_mask_applied there are also flatfield, angular_calibration and pixel_mask datasets which contains the correction values to apply if they are not applied in the electronics.

Should there be a countrate_correction NXfloat value, or am I missing something else which does the same job?

We booked that under a different name: it is the efficiency NXdata group in NXdetector. What we have there covers the complicated neutron case: detector efficiency is different
per pixel and dependent on wavelength. Which matters if you correct TOF detectors.

Does that help you?

   Regards,

              Mark K.

Thanks for your help

Mark

Dr Mark Basham, mark.basham at diamond.ac.uk<mailto:mark.basham at diamond.ac.uk> Tel: +44 1235 778853
Senior Software Scientist,                   www.diamond.ac.uk<http://www.diamond.ac.uk/>
Diamond Light Source, Chilton, Didcot, Oxon, OX11 0DE, U.K.

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