3D X-ray diffraction imaging for materials ID

Abstract

We present a 3D imaging technique, which combines the novel acquisition of diffracted X-ray signals and X-ray absorption data. The relatively high intensity of the diffraction signals afforded by our new approach has important implications for high specificity and high sensitivity security scanning applications. Our technique utilises a configuration of a tubular X-ray beam incident upon a ring absorption sensor and a diffraction sensor. The relative translation of the object under inspection enables the 3D scanning of extended objects. The sensing arrangement focuses on planes normal to the symmetry axis of the interrogating X-ray beam. Orders of magnitude increase in the intensity of the diffraction signal is possible in comparison with conventional angular dispersive methods. Our transmission mode approach effects a convergent and therefore inherently compact, diffracted ray geometry. We have undertaken initial testing and evaluation of this concept with various arrangements of objects fabricated from a range of different materials. The synthesis of the absorption and diffraction data is the basis for a new 3D imaging modality.