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- Title
Comparison between piezoelectric method and ultrasonic signal analysis for crack detection in type II multilayer ceramic capacitors.
- Authors
Ousten, Y.; Mejdi, S.; Tregon, B.; Danto, Y.; Bechou, L.
- Abstract
In this paper we present a comparison between two non-destructive techniques for crack detection in MLCCs. First, if a type II MLCC is biased with a DC field, the capacitor becomes temporarily ‘poled’ and can act as a transducer. This is induced by a residual piezoelectric effect used in the impedance spectroscopy method. Second, we used a scanning ultrasonic system working in the 10–100 MHz frequency bandwidth. To understand the ultrasonic signature, we used time-of-flight (TOF) detection with short-time Fourier transform (STFT) analysis to determine the depth and nature of defects with high accuracy. An application of digital signal processing to the characterization of defects is presented for a lot of MLCCs with cracks defects. For comparison, the same lot was tested with the piezoelectric method. The two techniques are closely correlated. © 1998 John Wiley & Sons, Ltd.
- Subjects
PIEZOELECTRIC devices; CERAMIC capacitors; ULTRASONICS; ELECTRIC impedance; PIEZOELECTRICITY
- Publication
Quality & Reliability Engineering International, 1998, Vol 14, Issue 2, p91
- ISSN
0748-8017
- Publication type
Article
- DOI
10.1002/(SICI)1099-1638(199803/04)14:2<91::AID-QRE167>3.0.CO;2-7