Polar ultrasonic backscatter produced by the bottom surface of a fiber-reinforced composite in cases where the composite is either thin or lacking enough in attenuation-causing features to allow non-negligible wave motion to reach through to this surface is discussed and a method for analyzing and extracting information from the backscatter is described. The constraints and requirements for the analysis are outlined and include an accounting for backscatter resulting from porosity. A single flat pore, characterized as a penny-shaped crack, is initially considered. Then the total effect of a distribution of pores is obtained by integration around the central ray of the incident ultrasonic beam.
|Original language||English (US)|
|Title of host publication||Review of Progress in Quantitative Nondestructive Evaluation|
|Number of pages||8|
|State||Published - 1988|
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