ASL (Average Signal Level)

Definition

ASL (Average Signal Level) is a parameter representing the average acoustic emission signal level over a specified time period.

Explanation

ASL is widely used in continuous AE monitoring applications where long-term signal trends are more important than individual transient hits. The unit of ASL value is in dB.

Key Notes

• Trend-based monitoring parameter
• Useful for long-duration monitoring
• Common in industrial process monitoring
• Often expressed in dB

Applications

• Tank monitoring
• Leakage monitoring
• Process equipment monitoring
• Structural health monitoring

FAQ

Q: What is the difference between ASL and RMS?

Both represent average signal intensity, but ASL is commonly displayed as a logarithmic signal level, while RMS is calculated directly from waveform magnitude.

Q: Is ASL suitable for burst-type AE signals?

ASL is more effective for continuous or long-duration monitoring than isolated burst signals.

Related Terms

RMS, Continuous Monitoring, AE Energy