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A stable reference light source based on an LED (Light Emission Diode) ispresented for stabilizing the conversion gain of the opto-electronic system ofa gamma- and fast-neutron radiographic and tomographic imaging device. Aconstant fraction of the LED light is transported to the image plane of thecamera and provides a stable reference exposure. This is used to normalize theimages during off-line image processing. We have investigated parametersinfluencing the stability of LEDs and developed procedures and criteria toprepare and select LEDs suitable for delivering stable light outputs forseveral 100 h of operation.

Development of an LED reference light source for calibration of radiographic imaging detectors