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[Imgcif-l] additional dictionary items to map marccd exposure,integration, readout times?
- To: The Crystallographic Binary File and its imgCIF application to image data <imgcif-l@iucr.org>
- Subject: [Imgcif-l] additional dictionary items to map marccd exposure,integration, readout times?
- From: Michael Blum <blum@rayonix.com>
- Date: Tue, 14 Oct 2008 22:53:34 -0500
marccd (the program) measures and records 3 elapsed times for each data frame. They are: exposure_time - the time elapsed during which the shutter was open. integration_time - the time elapsed during which the detector accumulated signal readout_time - the time elapsed during which the detector was being read. The original motivation to keep these times in the header was to facilitate correcting for dark current accumulation, which occurs on a CCD during the integration time and, with a different shape, during the readout. In practice, our detectors have such low dark current that this correction hasn't been necessary, BUT the recorded times have turned out to be very useful for diagnosis of beamline hardware, detector hardware, and beamline-detector synchronization problems. Currently, when writing CBF files, I can only store one of these numbers. I store the "exposure" time in diffrn_scan_frame.integration_time I would like to propose that the other times be added to the diffrn_scan_frame category, but I don't know what to propose for the names, since there is already a conflict between the current dictionary and my naming convention. Possibly: integration_time detector_integration_time detector_readout_time or integration_time accumulation_time readout_time regards, Michael _______________ Michael L. Blum Toll Free: 877-627-XRAY (627-9729) Rayonix, LLC Tel: 847-869-1548 1880 Oak Avenue Fax: 847-869-1587 Evanston, IL 60201 Email: blum@rayonix.com USA WWW: www.rayonix.com _______________________________________________ imgcif-l mailing list imgcif-l@iucr.org http://scripts.iucr.org/mailman/listinfo/imgcif-l
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