X-Ray Metrology for Quality Assurance

There is considerable current interest in deriving accurate dimensional measurements of the internal ge ometry of complex manufactured parts particularly castings This paper describes an approach to the re construction of D part geometry from multiple dig ital X ray images A novel method for radiographic stereo is described which takes into account the spe cial imaging geometry of the digital X ray sensor mod eled by a linear moving array or pushbroom camera The D reconstruction algorithm employs a nominal geometric model which is perturbed by X ray image constraints Manufacturing applications are discussed and illustrated by experimental results on synthetic phantoms and actual casting images