Table 4 AE waveform parameters of AE signals collected with the software program AEwin, including their respective abbreviation and unit
| AE parameter | Abbreviation | Unit |
|---|---|---|
| Rise time | RISE | µs |
| Counts from peak amplitude | COUN | – |
| Wave energy | ENER | 10–14 V2 s |
| Duration from peak amplitude | DURATION | µs |
| Peak amplitude | AMP | dB |
| Absolute frequency | AFRQ | kHz |
| Root mean square voltage | RMS | µV |
| Average signal level | ASL | dB |
| Reverberation frequency | RFRQ | kHz |
| Initiation frequency | IFRQ | kHz |
| Signal strength | SIGSTRNGTH | 10–9 V s |
| Absolute energy | ABSENERGY | aJ |
| Partial power 0–100 kHz | FREQPP1 | % |
| Partial power 100–200 kHz | FREQPP2 | % |
| Partial power 200–400 kHz | FREQPP3 | % |
| Partial power 400–800 kHz | FREQPP4 | % |
| Frequency centroid | FRQC | kHz |
| Peak frequency | PFRQ | kHz |