Appendix A: details of the application of the source identification scheme

• Published in: Journal of acoustic emission 2004-01, Vol.22, p.A1-A7
• Main Authors: Hamstad, M.A, O'Gallagher, A
• Format: Article
• Language: English
• ISSN: 0730-0050

The 19 signals in the database (three source types at six or seven depths each) were analyzed according to the scheme described in section eight. The analysis was done for both the 45/0 and 67.5/0DG angle ratios. Table A-1 outlines the key results for each case (a source type and source depth defined a case) of the three-source-type database when 45DG was the second radiation angle. In this table the logic of the analysis scheme outlined in section eight flows from left to right. The first column identifies the known source type. The scheme and calculations proceed starting from the third column as if the source type was unknown. The next-to-last column shows the source type that was "determined" for comparison with the known information. Table A-2 gives the same results for the choice of 67.5' for the second angle. The last column (called the "reduction factor") in each of these tables records the ratio of the peak WT magnitude of the primary frequency from the zero degree direction divided by the peak WT magnitude of the lowest peak magnitude at the second angle (primary or secondary as required) to uniquely determine the source type. The tables also record the percentage difference from the calculated primary and as needed secondary angle ratios for each signal case as compared to the average angle ratios (table 1) from the nearest source type(s) eliminated at each step.