Detection of Active Wood-Boring Insect Larvae Using Acoustic Emission Measurements: Principles, Experimental...

Area of Science:

• Wood science
• Insect ecology
• Conservation science

Background:

• Wood-boring insect larvae cause significant damage to wooden structures and cultural heritage.
• Distinguishing active from inactive infestations is crucial for effective conservation but challenging with visual inspection.

Purpose of the Study:

• To evaluate the effectiveness of acoustic emission (AE) measurement methods for detecting active wood-boring insect infestations.
• To assess the applicability of AE methods in both laboratory and field conditions for conservation purposes.

Main Methods:

• Experiments were conducted using AE sensors and specialized instrumentation (AMSY-6, IADS).
• Laboratory tests involved standardized wood specimens with single larvae of Hylotrupes bajulus, examining factors like temperature and sensor distance.
• Field tests were performed on large timber and in historic buildings to verify practical application and localization capabilities.

Main Results:

• AE sensors reliably detected larval activity of H. bajulus in standardized specimens.
• Detection reliability decreased with distance, with effective detection up to approximately 30 cm.
• The method demonstrated practical applicability and allowed for qualitative localization of larval activity in structural timber.

Conclusions:

• Acoustic emission sensing offers a non-destructive method for detecting wood-boring insect larval activity.
• AE technology can be applied in diverse settings, from controlled labs to field applications in historic structures.
• While expert interpretation remains vital, AE sensors enhance infestation assessment and conservation efforts.