X-ray line scan system for use in baggage inspection

G - Physics – 01 – N

Patent

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358/11

G01N 23/04 (2006.01)

Patent

CA 1171980

Abstract of the Disclosure A baggage system which employs a fan-shaped x-ray beam which scans baggage on a conveyor belt and produces images of the contents of the baggage on a video monitor. The output of an x-ray source is collimated into a narrow linear beam. Objects to be scanned are exposed to this beam with successive slices of the object being so exposed as the conveyor moves the object past the beam. A light emitting screen receives the beam after it has passed through the object and emits a light pattern in accordance with the characteristics of the object being scanned. The light output of the screen is received by an array of photo- diodes which generate electrical signals in accordance with the intensity of the light received thereby. The outputs of the photo-diodes are sequentially sampled to provide a series of signals in accordance with the photo-diode outputs, which signals are automatically corrected for diode gain and dark current variations in each of the diodes whenever there is a time interval between objects passing through the beam which is greater than a predetermined value. These signals are converted to digital form and stored in a memory. The output of the memory is fed through appropriate video output circuits to a video monitor where an image of the object being scanned is displayed.

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