Shad-o-Box 1K/2K HS User Manual
p. 17
10.
Synchronization Modes
The detector can be used in combination with either a DC X-ray source or a pulsed X-ray source.
Free running Mode
When using a DC X-ray source:
The detector is operating in a continuous, asynchronous mode. The integration time window equals the frame time
of the detector. Immediately after the readout, the pixels are reset and a new integration period commences. The
frame rate (#frames/second) is equal to 1/(integration time).
When using a pulsed X-ray source:
The figure shows the array row read-out as a function of time. The frame ReadOut containing the image information
is marked blue. The frame integration time is indicated by the horizontal distance between the two slanted ReadOut
lines and the actual image-capture interval is marked with the dark green rectangle.
Row #
Pixel Array
Time
ReadOut
Integration
Time
Frame (N)
Frame (N+1)
Trigger Input
Trigger Output
The period of time in between successive frame read-outs (dark green) is used to fire the pulsed X-ray source. The
width of this time-period can be programmed via the detectors command interface by adjusting the
ExtendedExposure(us) parameter. The ExtendedExposure register controls the time between frame ReadOuts.
Shuttering
Please note: the Shad-o-Box 1K/2K HS does not have a shuttering mechanism built into the detector. Therefore, it is
imperative that the x-ray source be shuttered or turned off before readout of the detector begins. Failing to do so may
cause a blur or smear effect in the x-ray image.
In order to ensure that x-ray emissions have completely ceased before the image readout begins; either add a shutter
in front of the x-ray source or use the Readout Delay feature to add time to allow the x-ray source to fully decay.
