X-ray computed laminographic system for plates and shells

A Computed Laminiography (CL) imaging system was developed based on the rotation scanning of tilted objects to realize tomographic imaging inspection of plates and shells. The system structure was outlined and the adopted X-ray source, detector and mechanical system were described. Then, according to the X-ray with matter interaction principle, the rotation laminiography scanning mode based on tilted objects was designed and its operation mechanism was analyzed. Furthermore, the algebraic iterative reconstruction algorithm and system geometric calibration method were discussed. Finally, the system was adjusted and the performance testing and the application experiments were carried out. Experimental results indicate that the imaging spatial resolution of the developed system reaches 3 lp/mm and the density resolution is 0.3%. It satisfies the high-precision tomographic imaging inspection requirements of plates and shells and the laminiographic testing performance for plates and shells is superior to that of traditional TC method.