These symbols will be used below to coordinate datasets with the same shape. number of scan points (only present in scanning measurements) number of detector pixels in the first (X, slowest) direction number of detector pixels in the second (Y, faster) direction number of detector pixels in the third (Z, if necessary, fastest) direction number of bins in the time-of-flight histogram Template of a detector, detector bank, or multidetector. Total time of flight Axis label absolute path to location in NXdetector In DAQ clock pulses Clock frequency in Hz Identifier for detector Data values [number of scan points,x_offset?,y_offset?,time_of_flight?] Title of measurement Integral of data as check of data integrity absolute path to location in NXdetector The best estimate of the uncertainty in the data value. Where possible, this should be the standard deviation, which has the same units as the data. absolute path to location in NXdetector offset from the detector center in x-direction. Can be multidimensional when needed. Axis label absolute path to location in NXdetector Offset from the detector center in the y-direction. Can be multidimensional when different values are required for each pixel. Axis label need some documentation here need some documentation here need some documentation here name/manufacturer/model/etc. information Local name for the detector Position and orientation of detector Solid angle subtended by the detector at the sample Size of each detector pixel. If it is scalar all pixels are the same size Size of each detector pixel. If it is scalar all pixels are the same size Detector dead time Detector gas pressure maximum drift space dimension Crate number of detector Equivalent local term Slot number of detector Equivalent local term Input number of detector Equivalent local term Description of type such as He3 gas cylinder, He3 PSD, scintillator, fission chamber, proportion counter, ion chamber, ccd, pixel, image plate, cmos, ... Spectral efficiency of detector with respect to e.g. wavelength efficiency of the detector need some documentation here real-time of the exposure (use this if exposure time varies for each array element, otherwise use count_time field) date of last calibration (geometry and/or efficiency) measurements summary of conversion of array data to pixels (e.g. polynomial approximations) and location of details of the calibrations How the detector is represented Elapsed actual counting time In order to properly sort the order of the images taken in (for example) a tomography experiment, a sequence number is stored with each image. This is the x position where the direct beam would hit the detector. This is a length, not a pixel position, and can be outside of the actual detector. This is the y position where the direct beam would hit the detector. This is a length, not a pixel position, and can be outside of the actual detector. This is the start number of the first frame of a scan. In PX one often scans a couple of frames on a give sample, then does something else, then returns to the same sample and scans some more frames. Each time with a new data file. This number helps concatenating such measurements. The diameter of a cylindrical detector The acquisition mode of the detector. True when the angular calibration has been applied in the electronics, false otherwise. Angular calibration data. True when the flat field correction has been applied in the electronics, false otherwise. Flat field correction data. Errors of the flat field correction data. True when the pixel mask correction has been applied in the electronics, false otherwise. The pixel mask for the detector. Contains information about dead, blind or high pixels. True when a countrate correction has already been applied in the electronics, false otherwise. How many bits the electronics reads per pixel. With CCD's and single photon counting detectors this must not align with traditional integer sizes. This can be 4,8,12,14,.... Time it takes to read the detector (typically milliseconds). This is important to know for time resolved experiments. Time it takes to start exposure after a trigger signal has been received. This is important to know for time resolved experiments. Time during which no new trigger signal can be accepted. Typically this is the trigger_delay_time + exposure_time + readout_time. This is important to know for time resolved experiments. This is time for each frame. This is exposure_time + readout time. The gain setting of the detector. This influences background etc. The value at which the detector goes into saturation. Especially common to CCD detectors, the data is known to be invalid above this value. CCD images are sometimes constructed by summing together multiple short exposures in the electronics. This reduces background etc. This is the number of short exposures used to sum images for an image. At times radiation is not directly detecte by the detector but rather by looking at some converter like a scintillator. This is the name of this converter material. At times, radiation is not directly detected by the detector but rather by looking at some converter like a scintillator. This is the thickness of this converter material. Single photon counter detectors can be adjusted for a certain energy range in which they work optimally. This is the energy setting for this.