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The acoustic emission associated with the initiation and the growth of electrical trees inpolymeric materials is examined under ac voltage application. Two kinds of acoustic emission waveform, a burst type and an impulse type, are observed, which suggest different tree-forming causes. The procedure can provide not only a non-destructive testing technique but also a means for investigating the tree-forming mechanism.
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Kagawa et al. (1982) studied this question.
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