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Authors: John Nagel (Iowa State University) , Chien-Ping Chiou (Iowa State University) , Leonard J. Bond (Iowa State University) , Waled Hassan (Rolls-Royce North America)
Pulsed terahertz imaging was used to inspect several oxide/oxide ceramic matrix composite samples. A data processing framework was created in order to detect test defects that were imbedded in the samples. Signal and imaging processing techniques were used in order to process the data, automatically detect defects, and calculated the signal-to-noise ratio was calculated for all detected defects. The detection performance between C-Scan images that were constructed using a single wide time gate and multiple narrow time gates are examined. We used the signal processing technique of spatial signal averaging was also used to remove deterministic interference in the sample that was present as the result of multi-layer reflections and water vapor. The effect of the removal of the deterministic interference on the signal-to-noise ratios is presented and discussed.
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How to Cite: Nagel, J. , Chiou, C. , Bond, L. J. & Hassan, W. (2019) “Terahertz defect evalution in oxide/oxide ceramic matrix composites”, Review of Progress in Quantitative Nondestructive Evaluation.(0).