Study Of X-ray Real-time Imaging Inspection System Based On DXR250RT Flat-panel Detector

Flat panel detector measures to be one of promising techniques in modern radiation testing for its real-time digital imaging and diagnosis. But the interrelated research and application of flat-panel detector are few at home. For developing a late-model X-ray digital real-time imaging inspection system, the intramural structure, imaging principle and working mode of DXR250RT flat panel detector from GE Company are researched in this dissertation. Besides noise source and restraining methods of imaging system based on DXR250RT. It was developed that the software integrated image capturing, image processing and movement control function.The technology base of X-ray imaging inspection was studied in this paper. The main contents include bringing and characters of X-ray, and offects when it acts to substance. After the attenuation law of X-ray which perforates substance and X-ray defects testing principle were analyzed. Influence factors of X-ray imaging sensitivity was disussed and effective restraining measures were brought forward.Working mode and noise source of imaging inspection system were researched further after the intramural structure, imaging principle of DXR250RT and system functions were analyzed. On the base, the Restriction Minimum Two-Multiply Filter was brought. Some popular estimate parameters to digital imaging quality were introduced. Such as MTF, NPS, DEQ and NEQ.After working flow and digital image display principle on computer were studied, image capturing and display software were developed based on command processor by Visual C++6.0 on Windows XP platform. According to features of X-ray digital images, many kinds of image-processing algorithm including grey-level transform, smoothing and sharpening were studied. Image-processing software was designed can also accomplish functions. For example,suppressing noise, stretching contrast and stressing details. FPD requires scan in a two dimensional plane when the workpiece size exceed its inspection area. For the reason, the movement control system was designed based on computer mode.