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New digital tomosynthesis system to monitor the soldering states of a ball grid array

This paper represents a new method to monitor the soldering state of a ball grid array by newly designed digital tomosynthesis system. Firstly, a new digital tomosynthesis (DTS) system, called object-detector synchronous rotation (ODSR), is suggested and designed to acquire images for the soldering state of a ball grid array. Secondary, the shape distortion of DTS images generated by an image intensifier is modeled. And a new synthesis algorithm, which overcomes the limitations of the existing synthesis algorithms is suggested to improve the sharpness of the synthesized image. Also an artifact analysis of the DTS system is performed. Thirdly, the experiment to obtain the cross-sectional images of ball grid arrays is accomplished by the ODSR system.