D. Malec, Technical problems encountered with the laser induced pressure pulse method in studies of high voltage cable insulators, MEAS SCI T, 11(5), 2000, pp. N76-N80
The laser induced pressure wave propagation method is often used to measure
the space charge distribution in solid insulators. This method gives rise
to many advantages, so it is widely used both in industrial and in research
laboratories. However, it is necessary to take some precautions before tre
ating induced signals in order to minimize calculation errors. Here, some q
uantitative information about the effects of approximations and the technic
al problems arising from this method used to study cable insulators are pre
sented. Data from semiconductor/polyethylene samples have been obtained. So
me recommendations defining an appropriate experimental protocol of space c
harge measurement in high voltage cable insulators are given.