A1 Journal article (refereed), original research

Acoustic Detection of Cracks and Delamination in Multilayer Ceramic Capacitors


Open Access publication

Publication Details
Authors: Levikari Saku, Kärkkäinen Tommi J., Andersson Caroline, Tamminen Juha, Silventoinen Pertti
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Publication year: 2018
Language: English
Related Journal or Series Information: IEEE Transactions on Industry Applications
ISSN: 0093-9994
eISSN: 1939-9367
JUFO-Level of this publication: 2
Open Access: Open Access publication
Location of the parallel saved publication: http://urn.fi/URN:NBN:fi-fe2018111247863

Abstract
Multilayer Ceramic
Capacitors (MLCC) are the most widely used capacitor type in the
electronics industry. However, the brittle ceramic dielectric makes
MLCCs prone to mechanical damage. Manufacturing defects or damage during
board assembly may cause a capacitor to prematurely fail during its
operational life. Here, we demonstrate fast and nondestructive acoustic
screening of MLCCs. Soldered 2220-sized MLCCs were subjected to AC
voltage frequency sweeps, causing them to vibrate mechanically. Acoustic
responses of the capacitors were measured before and after subjecting
the test circuit board to severe bending. The results show that cracks
and delaminations caused by bending induce characteristic changes in the
capacitors' acoustic response. A Support Vector Machine classifier was
trained to successfully detect damaged capacitors based on their
acoustic response.

Last updated on 2019-13-03 at 12:00