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Experiments were carried out using space charge distribution measurements as a major measurement method in order to find effective measures to suppress electrochemical migration (ECM) along the thickness direction of a printed wiring board (PWB). As a result, the following valuable knowledge was obtained. First, in a PWB consisting of paper/ phenol-resin composite and a copper electrode, the electrical...
We have been developing an electromagnetic field intensity measurement system using an absorption screen made of dielectric material. In this developed system, a very small change of temperature on an absorption screen illuminated by the electromagnetic wave is measured using an infrared camera with 2-D lock-in processing technique. An antenna is ordinary used for measurement of electromagnetic field...
Pulsed electroacoustic (PEA) method was applied as a nondestructive method to detect electrochemical migration in a sheet of epoxy resin and a sheet of laminate consisting of the same resin and a paper/phenol-resin composite. A significant decrease in the amount of negative charge was observed at the interface between the resin and the composite when the sample was the laminate. This is assumed to...
Pulsed electroacoustic (PEA) method is applied as a nondestructive technique to detect ion migration that progresses to the thickness direction in insulation composites for printed circuit boards. In both cases of a paper/phenol-resin composite and a glass/epoxy-resin composite, penetration of Cu migration into the bulk after aging was confirmed. Namely, a shift of the peak location of positive charge,...
In our previous paper, we found an interesting packet-like charge behavior in low- density polyethylene (LDPE) under high dc electric field of more than 1 MV/cm. When such a high dc electric field was applied to LDPE film, a huge amount of positive packet-like charge of more than 100 C/m3 was injected into the bulk of the film and it moved towards the cathode side increasing its amount of charge....
The measurement of volume charges within insulators has been attempted by various methods, including thermal, optical, mechanical, and electrical stimulation of the sample. A new method incorporating pulse electrical stimulation and pulsed acoustic detection is reported here. This technique is an extension of a previously reported [1] high frequency AC steady state electro-acoustic measurements in...
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