Abstract
Porosity that is detrimental to the performance of a composite structure is often much smaller than can be detected using conventional ultrasonic testing methods. The direct ultrasonic reflection can be too small to detect, and the back wall and through transmission signals may not be significantly changed in amplitude. Thus, improved inspection methods to detect and quantitatively measure micro porosity are of considerable interest. The goals of the study reported here were to (1) evaluate conventional pulse echo and through transmission methods for detection and characterization of micro porosity in composite materials, (2) develop signal processing methods for measuring micro porosity content, and (3) compare results of developed algorithms to conventional inspection results.
Published Version
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