Non-destructive evaluation (NDE) of composites: dielectric techniques for testing partially or non-conducting composite materials

摘要: Abstract: This chapter describes the use of high- and low-frequency methods for non-destructive characterization insulating or low-conductivity composite structures. The measurements allow study progress cure through interdigitated electrodes buried in laminate structure. Water ingress into composites can also be mapped by frequency range 1 Hz to 1 kHz. large format probes has made it possible explore water distribution ship hulls similar structures which have been exposed prolonged periods time. Measurements at microwave frequencies defects detected within determine location water- air-filled voids. At very high are sensitive stand-off distance order achieve highest resolution is necessary computer models assist with analysis data. With appropriate vector phase shifting mapping difficult detect other methods.