Table 3.
Ranges and maximum levels of AE signal characteristics.
| Class | 1 | 2 | 3 | 4 | 5 |
|---|---|---|---|---|---|
| Signal Strength (SS) (pV∙s) | 1.8 × 104 ÷ 8.0 × 106 |
4.8 × 106 ÷ 2.4 × 107 |
1.0 × 107 ÷ 3.0 × 107 |
3.0 × 107 ÷ 5.8 × 107 |
8.8 × 107 ÷ 1.2 × 108 |
| Amplitude (V) | 0.43 (4%) | 7.5 (75%) | 8.8 (80%) | 8.8 (88%) | 8.81 (88%) |
| FFT Real (V) | ±(20 ÷ 38) | ±350 | ±1000 | ±(1000 ÷ 2000) | ±(750 ÷ 1500) |
| Frequency (kHz) | 100 | 250 ÷ 270 | 250 ÷ 270 | 60; 250 ÷ 300 | 60; 75 |
| Duration (μs) | 400 | 520 | 520 | 1000 | 4000 |
| WTD (Auto Correlation) Energy (eu) | 10 | 3000 | 11500 | 18000 | 12000 |