Roll-to-Roll In-Line Implementation of Microwave Free-Space Non-Destructive Evaluation of Conductive Composite Thin Layer Materials

A free-space microwave nondestructive testing and evaluation module is developed for the low-power, non-ionizing, contactless, real-time characterization of doped composite thin-film materials in an industrial context. The instrumentation proposed built up with a handled vector network analyzer interfaced corrugated horn antennas to measure near-field complex reflection S11 planar prepreg roll-to-roll in-line production line. Dedicated modeling calibrations routines are extract conductivity from measured signal. Practical extraction radiofrequency (RF) thin film nano-powders exemplary shown at test frequency 10 GHz.