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Active vs Passive Monitoring

Active and passive monitoring represent two complementary approaches to evaluating structural integrity. Active methods rely on externally generated signals to detect existing defects, while passive methods—such as acoustic emission—detect natural

Types of Acoustic Emission Sources

Types of Acoustic Emission Sources Definition Acoustic emission (AE) sources are the physical origins of transient elastic waves generated within a material or structure during active processes such as deformation, damage, or interaction. TIn acoustic

All Terms

A. 基础概念（Fundamentals） 1．Acoustic Emission (AE) 2．AE Source 3．Elastic Wave 4．Transient Signal 5．Stress Wave 6．Passive Monitoring 7．Active Source 8．Structural Health Monitoring (SHM) 9．Damage Mechanism 10．Energy

Acoustic Emission (AE)

1、 Acoustic Emission (AE) Definition Acoustic Emission (AE) is the phenomenon of transient elastic waves generated by the rapid release of energy from localized sources within a material. Explanation In acoustic emission testing, these waves are det

AE Sensor

2、 AE Sensor Definition An AE sensor is a transducer that converts acoustic emission waves into electrical signals for analysis. Explanation Typically based on piezoelectric materials, AE sensors detect high-frequency stress waves generated by damag

AE Event

3、 AE Event Definition An AE event is a physical occurrence within a material that generates acoustic emission waves. Explanation It represents a real damage mechanism such as crack initiation, crack growth, or fiber breakage, which may produce mult

Threshold

5、 Threshold Definition Threshold is the minimum signal level required for an acoustic emission system to detect and record a hit. Explanation It is used to filter out background noise and ensure that only meaningful acoustic emission signals are ca

Amplitude

6、 Amplitude Definition Amplitude is the peak voltage of an acoustic emission signal, usually expressed in decibels (dB AE). Explanation It reflects the strength of the detected signal and is influenced by both source intensity and wave attenuation.

Counts

7、 Counts Definition Counts are the number of times an acoustic emission signal crosses the threshold during a hit. Explanation They indicate signal activity and waveform complexity, often used for monitoring emission intensity. Key Notes Reflects s

Energy

8、 AE Energy Definition AE energy is a measure of the signal strength over time, representing the total energy of an acoustic emission signal. Explanation It is commonly calculated from the signal envelope and used to assess the severity of damage p