Portable Automated Radio-Frequency Scanner for Non-destructive Testing of Carbon-Fibre-Reinforced Polymer Composites

• Published in: Journal of nondestructive evaluation Vol. 35; no. 2; pp. 1 - 8
• Main Authors: Salski, B., Gwarek, W., Kopyt, P., Theodorakeas, P., Hatziioannidis, I., Koui, M., Chong, A. Y. B., Tan, S. M., Kappatos, V., Selcuk, C., Gan, T. H.
• Format: Journal Article
• Language: English
• Published: New York Springer US 01-06-2016
• Subjects: Automation; Carbon fiber reinforced plastics; Characterization and Evaluation of Materials; Classical Mechanics; Control; Dynamical Systems; Engineering; Nondestructive testing; Polymer matrix composites; Portability; Scanners; Sensor arrays; Sensors; Solid Mechanics; Vibration; Scanner; CFRP; Inductive sensors
• ISSN: 0195-9298; 1573-4862
• DOI: 10.1007/s10921-016-0343-y

A portable automated scanner for non-destructive testing of carbon-fibre-reinforced polymer (CFRP) composites has been developed. Measurement head has been equipped with an array of newly developed radio-frequency (RF) inductive sensors mounted on a flexible arm, which allows the measurement of curved CFRP samples. The scanner is also equipped with vacuum sucks providing mechanical stability. RF sensors operate in a frequency range spanning from 10 up to 300 MHz, where the largest sensitivity to defects buried below the front CFRP surface is expected. Unlike to ultrasonic testing, which will be used for reference, the proposed technique does not require additional couplants. Moreover, negligible cost and high repeatability of inductive sensors allows developing large scanning arrays, thus, substantially speeding up the measurements of large surfaces. The objective will be to present the results of an extensive measurement campaign undertaken for both planar and curved large CFRP samples, pointing out major achievements and potential challenges that still have to be addressed.