Dual and Multi-energy Radiography for CFRP Composites Inspection

摘要

Dual-energy X-ray imaging techniques are based on the energetic dependency of X-ray material attenuation, and provide information about material composition or thickness. The most extensively used processing method is the decomposition onto a material basis using a polynomial model, estimated from experimental dual-material calibration. In this study we focus on materials that are particularly close in terms of attenuation. The differentiation becomes almost impossible, noise being increased by the data processing steps. A typical application case is the inspection of CFRP composites. Carbon fiber and resin attenuations are close. In this study standard integration detector as well as semi-conductor based detectors are considered. Dual-counting and spectral modes provide dual energy information in a single exposure. Performances are compared to standard dual-energy decomposition. Multi-energy protocol is also investigated. We present preliminary results, driven by the context of CFRP inspection.