Methods to Perform Behind-Armour Debris Analysis With X-Ray Films

摘要

The Behind-Armour (BA) debris cloud created behind the target after a projectile impact can easily be observed using x-ray technology. Some countries use this technology to evaluate the lethality of the threat since the number of fragments, mass and velocity can be estimated. Usually, two orthogonal x-ray stations are located behind the target in order to obtain orthogonal images at two different times. Since only projected images of BA debris are recorded on films (two dimensions), a major issue to solve concerns the available information. An analysis of these x-ray films becomes time- consuming when the fragments must be matched from one station to another or from corresponding horizontal and vertical views. Also, the distances seen on the films are projected distances that are different from the real distance travelled by fragments. This memorandum presents equations, methods and tools that can be used to rapidly locate fragments in space (three dimensions) in order to accurately compute their velocity, trajectory and finally assess their mass based on x-ray films only.