Breakdown patterns in Branly's coheror
D. Vandembroucq, A. C. Boccara, S. Roux
Abstract
We use thermal imaging of Joule heating to see for the first time electrical conducting paths created by the so-called Branly effect in a two-dimensional metallic granular medium (aluminium). Multiple breakdowns are shown to occur when the medium is submitted to high voltage increases (more than 500 V) with rise times close to one hundred of microseconds.
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