2017 IEEE 11th International Symposium on Diagnostics for Electrical Machines, Power Electronics and Drives (SDEMPED) 2017
DOI: 10.1109/demped.2017.8062419
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Acoustic detection of cracks and delamination in Multilayer Ceramic Capacitors

Abstract: Multilayer ceramic capacitors (MLCC) are the most 5 widely used capacitor type in the electronics industry. However, 6 the brittle ceramic dielectric makes MLCCs prone to mechanical 7 damage. Manufacturing defects or damage during board assembly 8 may cause a capacitor to prematurely fail during its operational 9 life. Here, we demonstrate the fast and non-destructive acoustic 10 screening of MLCCs. Soldered 2220-sized MLCCs were subjected 11 to ac voltage frequency sweeps, causing them to vibrate mechan-12 ic… Show more

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Cited by 10 publications
(23 citation statements)
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“…3(b) lists some commonly used parameter acquisition methods. It is found that industrial instruments including weighting meters [108], [109], X-ray image meters [110], optical inspection meter [111], acoustic detection meter [112], thermography meter [113], etc., are widely used to obtain non-electrical parameters. Moreover, internal temperature sensors [114] and internal pressure sensors [115] are employed to obtain the internal temperature and pressure of capacitors.…”
Section: B Design Procedures For Condition Monitoringmentioning
confidence: 99%
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“…3(b) lists some commonly used parameter acquisition methods. It is found that industrial instruments including weighting meters [108], [109], X-ray image meters [110], optical inspection meter [111], acoustic detection meter [112], thermography meter [113], etc., are widely used to obtain non-electrical parameters. Moreover, internal temperature sensors [114] and internal pressure sensors [115] are employed to obtain the internal temperature and pressure of capacitors.…”
Section: B Design Procedures For Condition Monitoringmentioning
confidence: 99%
“…Usually, some data training algorithms are used to distinguish the damaged and undamaged capacitors. In [112], an acoustics detection based method is applied to detect the micro-crack of capacitors, as shown in Fig. 4…”
Section: ) End-of-life Criteriamentioning
confidence: 99%
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“…However, while the acoustic emissions carry information about the structural condition of a capacitor, the signs of damage can be hard to detect. The amplitudes and frequencies of the mechanical resonances exhibited by MLCCs show variation even between intact components, and although mechanical damage often manifests as new resonant peaks, such peaks do not always appear [23]. Moreover, factors such as electromagnetic interference and variations in the mechanical contact between the sensor and the capacitor can cause artifacts that could be misinterpreted as signs of damage.…”
Section: B Acoustic Emissions In Mlccsmentioning
confidence: 99%