Recent Advances in Nondestructive Evaluation Made Possible by Novel Uses of Video Systems

Complex materials are being developed for use in future advanced aerospace systems. High-temperature materials have been targeted as a major area of materials development. The development of composites consisting of ceramic or metallic matrix, and ceramic fibers or whiskers is currently being aggressively pursued internationally. These advanced materials are difficult and costly to produce; however, their low density and high operating temperature range are needed for the next generation of advanced aerospace systems. These new materials represent a challenge to the nondestructive evaluation community. Video imaging techniques not only enhance the nondestructive evaluation, but they are also required for proper evaluation of these advanced materials. Specific research examples are given, highlighting the impact that video systems have had on the nondestructive evaluation of ceramics. An image processing technique for computerized determination of grain and pore size distribution functions from microstructural images is discussed. The uses of video and computer systems for displaying, evaluating, and interpreting ultrasonic image data are presented.