BASICS OF ACOUSTICS: Measurable flaw characteristics
5 MEASURABLE FLAW CHARACTERISTICS
After the flaw is detected, the operator must make decisions about the rejection or the suitability of the product for further use. For a reasonable decision it is necessary to determine the measured characteristics of the flaw and to compare them with the values specified in the normative documentation. In most cases, one or more measured characteristics are used as the rejection criterion, which in this case can be called the main measurable characteristics.
The aggregate of all measured characteristics of the defect is summarized in Table 6.1
Table 6.1 – Measured characteristics of the defect
Defect coordinates
Depth of occurrence of the flaw, Y, mm
Distance to the flaw on the input surface, X, mm
Distance to the flaw along the beam, R, mm
Amplitude characteristics
Amplitude, N, dB
detectability factor, KD, dB
Equivalent area, SE, mm2
| Defect coordinates | Depth of occurrence of the flaw, Y, mm Distance to the flaw on the input surface, X, mm Distance to the flaw along the beam, R, mm |
| Amplitude characteristics | Amplitude, N, dB detectability factor, KD, dB Equivalent area, SE, mm2 |
| Conditional sizes | The conditional boundary of the flaw Conditional width, ΔX, mm Conditional length, ΔL, mm Nominal height, ΔY, mm |
| Flaw shape | Flaw form factor, KD Compact and extended Round and planar |